A Monograph of the British Carboniferous Trilobites

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Palaeontographical Society, 1884 - 86 pagina's
 

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Pagina 71 - PORTLOCK.- REPORT ON THE GEOLOGY OF THE COUNTY of LONDONDERRY, and of Parts of Tyrone and Fermanagh, examined and described under the Authority of the Master-General and Board of Ordnance. By JE PORTLOCK, FRS &c.
Pagina 82 - I have first distinguished under the name of synthetic types. Its resemblance to the Trilobites is unmistakable, and very striking. In the first place the head stands out distinct from the thoracic regions, as the buckler of Trilobites; and the large, kidney-shaped facetted eyes recall those of Calymene; moreover, there is a facial suture across the cheeks, as in Trilobites, so that, were it not for the presence of the antennae, which project from the lower side of the anterior margin of the buckler,...
Pagina 46 - ... length, having a basal lobe on each side, but no short lateral furrows on the glabella ; neck-furrow distinctly marked, equal in width to the posterior border of free cheeks ; eyes small, smooth, equal to half the length of the glabella ; no facial suture visible, only the axal furrow surrounding the glabella and the neck-furrow ; free-cheeks slightly convex, nearly twice as long as they are broad, with no visible suture separating them from one another in front of the glabella : margin broad...
Pagina 9 - A Catalogue of British Fossil Crustacea, with their Synonyms and the Range in Time of each Genus and Order.
Pagina 73 - its course (he states) is obliquely upwards from the eye tubercle to the upper end of the glabella, where it appears to terminate in a solitary deep perforation, similar to those which surround the head
Pagina 47 - Cephalothorax truncato-orbicular ; limb narrow, produced backwards into flattened spines ; glabella smooth, cylindrical or ovate, about twice as long as wide, not reaching within about its own diameter of the front margin ; one pair of small, basal, cephalothoracic furrows, or none. Eyes reniform, in the midst of the cheeks (? smooth) ; eye-lines unknown. Surface strongly granulated ; one tubercle on each side of the anterior end of the glabella, the marginal row and a circle round each eye being...
Pagina 48 - Trilobites, under the impression that it formed the type of a new genus and species, but probably from there being but one specimen it was placed provisionally by that author in his genus Phillipsia, from which it differs in its small, short glabella, smooth eyes, want of cephalothoracic furrows, &c. Having now examined numerous specimens of the Australian species, there can be no longer any doubt of the distinctness of the group from Phillipsia from the characters of the cephalothorax, and the pygidium...
Pagina 47 - Eyes reniform, in the midst of the cheek (? smooth) ; eye-line unknown. Surface strongly granulated ; one tubercle on each side of the anterior end of the glabella, the marginal row and a circle round each eye being larger than the rest. Bodysegments unknown. Pygidium nearly resembling the cephalothorax in size and form, rather more pointed, strongly trilobed, and with a thickened prominent margin ; axal lobe about as wide as the lateral lobes, of about seventeen narrow segments ; lateral segments...
Pagina 61 - Wales." 1875. — Mr. Townshend M. Hall,* in his 'Notes on the Anthracite Beds of North Devon,' writes, "In the North Devon district the anthracite (Culm) is found in the Millstone-Grit, a series of beds belonging to the Carboniferous formation, but of an age immediately antecedent to that of the true Coal-Measures.
Pagina 60 - Austen,1 whose paper was read December 13th, 1837, describes the Culmiferous deposits of the South-east of Devonshire, and particularly at Ugbrook Park, near Chudleigh, and other adjacent places, and states that Prof. Sedgwick considered them as a portion of the Culmiferous beds of the centre of...

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