﻿Vol. 66.] 



THE CAMBRIAN ROCKS OF COMLET. 



35 



one short depression near the same angle, representing a marginal 

 groove. There is no trace of any spine or tubercle. 



This pygidium differs from that figured by Walcott in the absence 

 of any division of the axis, and in the fact that the side-lobes are 

 not connected together behind the axis. 



The cranidia which I have referred to this species differ in 

 several particulars from the characters shown in Dr. Walcott's 

 figures 1 of his variety of Agraulos strenuus, Bill. 





Agraulos strenuus, var. 



nasutus, from Walcott's 



figures. 



Agraulos (Strenuella) 

 salojpiensis. 



Width at anterior 

 facial suture 



Width at posterior 

 facial suture 



considerably less than width 

 across eye-lobes. 



considerably more than 

 width across eye-lobes. 



broad and stout. 



distinct. 



distinct. 



distinct. 



nearly half the length of 

 the head-shield, omitting 

 the spine. 



slightly less than width 

 across eye-lobes. 



not exceeding width across 

 eye-lobes. 



strong, but elongate and 

 slender. 



almost obliterated. 



almost obliterated. 



obsolete. 



about one-third the length of 

 the head-shield, omitting 

 the spine. 



Glabellar furrows 



( )ccipital furrow 



Axial furrow 



Eve-lobe 





Prom Agraulos (Strenuella 1) lialliana, Matthew, the differences 

 of the Shropshire species are more marked. A. (Str.) halliana has 

 the cheek-lobes ' connected in front of the glabella/ the frontal 

 margin is only a little raised, the fixed cheeks have a steep slope to 

 the axial furrow, 2 the ' tubercular process ' (geniculation) of the 

 postero-lateral margin appears to be at a less distance out from the 

 glabella, and the eye-lobe is ' short and not prominent.' 



From Anomocare, as figured by Angelin, 3 there are numerous 

 differences. In all the seven species the fixed cheeks are decidedly 

 narrow. A. Iceve, Ang., is perhaps nearest to the Shropshire 

 species in the convexity of the axis and course of the facial suture, 

 but the glabella, front margin, occipital ring, and free cheeks are 

 all very different. 



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

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

 quarry. 



1 10th Ann. Eep. U.S. Geol. Surv. 1888-89 (1890) pi. xcvii, figs. 2, 2a-c. 



2 Mr. Matthew's figures appear to have been drawn from internal casts. 



3 ' Palseont. Scan.' 1854, pi. xviii. 



d2 



