﻿40 ME. E. S. COBBOLT) ON TRILOBITES FROM [Feb. ICJIO, 



fourth pair is indicated at the sides of the glabella in advance of 

 the ocular ridge (see PL IV, fig. 11). The geniculation of the 

 posterior border is proportionately farther out. 



Forms referable to A. platycepludum have been recognized, 

 ranging down to 4 millimetres in length of head-shield ; those of 

 A. jDarvum vary from 2*3 to 4 millimetres, but have not been 

 found larger. It would therefore appear to be a much smaller 

 species. Narrow and wide forms [143 & 275] of this species are 

 illustrated by the two figures (PI. IV, figs. 11 & 12). 



The thoracic segment [172] (fig. 14) and fragmentary free cheek 

 [177] (fig. 13) may possibly belong to this species. 



Locality and horizon. — The same as in the case of Anomocare 

 ■pldtycephalum. 



Anomocare (?) pustulatum, sp. nov. (PI. VI, figs. 1, 2, & 3.) 



E. S. Cobbold, Anomocare vel Agraidos sp., Rep. Brit. Assoc. 1908 (Dublin) 

 1909, p. 237. 



Portions of six or seven head-shields and some thoracic fragments 

 from various exposures in the Quarry Ridge, Comley, indicate a 

 species with a very pustulate test. Of these, two of the larger 

 cranidia [186, 188] and one axis ring [196] are selected for illus- 

 tration. 



Cranidium : Size — moderate, 1 11 to 12 millimetres in length. 



General form. — Subquadrangular, with rounded front; pro- 

 portion of length to width =3:4; widest across the eyes. 



General convexity. — Considerable, about A; the features 

 are in very strong relief. 



Glabella. — Convex; parallel-sided; truncately rounded at the 

 apex ; having four pairs of furrows well marked at the sides, but 

 not continuous across ; the posterior pair inclined backwards, the 

 others transverse ; the anterior pair only just visible at the sides. 



Occipital furrow. — Wide and deep ; continuous across. 



Occipital ring. — Strong; subequai in the middle to the length 

 of the glabellar lobes, but shorter at the sides ; projecting backwards 

 beyond the general posterior margin of the shield ; without spine 

 or tubercle. 



Axial furrow. — Wide and deep; not continuous round the 

 apex of the glabella, where its place is taken by the hollow part of 

 the frontal limb. 



Fixed cheek. — Nearly equal in width to the glabella; some- 

 what quadrangular in outline ; most elevated at about three- 

 quarters of its width out from the glabella ; in transverse section 

 the surface rises slightly from the axial furrow, is then nearly 

 horizontal to the highest point, from which it falls steeply down 

 to a wide hollow parallel with the eye-lobe ; this hollow is partly 

 filled up by a buttress between the eye-lobe and the tumidity of 

 the cheek (this is indicated by a change in intensity of the shading 

 in the figures of both the internal and the external casts); the cheek 



1 Since the above description was written, specimens referred to this species 

 have been found, ranging from 3 to 16 millimetres in length. 



