﻿Vol. 66, ,] THE CAMBRIAN ROCiCS OF COMLEY. 39 



form is entirely lost, but there are two depressions on the broken 

 edge, which have the appearance of being the bases of two 

 marginal spines or processes directed backwards. 



Pygidial spines (?). — Two specimens of spines [178, 873] 

 (PI. V, figs. 7 & 9) may possibly belong to the pygidium of this 

 species, although they are somewhat too large to fit the individual 

 pygidium figured. 



Each consists of an elongate cylindrical spine with a swollen 

 bisymmetrical base, which is rounded above but flattened or perhaps 

 even hollowed below. Beyond the base there is a constriction or 

 furrow separating it from an annulation, which looks like an 

 articulating surface, but the front edge is, in both specimens, 

 broken and shows no margin. The surface-characters are identical 

 with those of the free cheek [163] previously described (see PI. V, 

 fig. 8), being finely granular on the base, in this respect matching the 

 pygidium figured (PI. V,fig. 6), and graduating to a system of raised 

 lines on the spine itself. They would appear to have projected 

 upwards and backwards, and to have been bent more decidedly 

 backwards at a little distance above the axis. 



Associated as they are with fragments of both the Strenuella and 

 the Anomocare, it is possible that they might belong to either 

 genus ; but the swollen base and constriction are very different from 

 the bases of both the nuchal and the thoracic spines of the former, 

 and the surface-characters point strongly to a reference to the 

 same species as the free cheek [103], the characters of which again 

 match with those of the cranidium [144] (not figured) that is re- 

 ferred to the Anomocare. 



The general form of these spines is very like that of the 

 detached ' horizontal spines ' figured by the late Dr. E. Schmidt as 

 belonging to his Olenellus (Mesonacis) mickwitzi. 1 



Locality and horizon. — Comley, from the upper part of 

 the grey limestone of the excavation, 200 yards south of the 

 quarry. 



Axomocare parvum, sp. nov. (PI. IV, figs. 11-14.) 



E. S. Cobbold, Anomocare sp. 3, Rep. Brit. Assoc. 1908 (Dublin) 1909, p. 236. 



A minute form nearly related to A. platyceplicdum, but which 

 seems to be specifically distinct, is found in considerable numbers 

 in the same rock. 



In general form, in convexity, and in surface-characters these 

 cranidia have so strong a likeness to A. platyceplicdum, that it is 

 unnecessary here to do more than indicate the differences. 



The glabella is, proportionately, rather more strongly convex 

 and somewhat less wide. The frontal limb has no thickened 

 rim ; it stands out almost horizontally from the end of the glabella, 

 and its anterior edge is slightly upturned. 



The glabellar furrows are more distinctly impressed, nar- 

 rower and more uniformly transverse ; and, in some instances, a 



1 ' Ueber eiue neuentdockte Untercambrische Fauna in Estland ' Mem. Acad. 

 Imp. Sci. St. Fetersb. ser. 7, vol. xxxvi (1888) no. 2, pi. i, figs. 23 & 24. 



