PTERYGOTUS STYLOPS. 



91 



Species 10.— PTERYGOTUS (?) STYLOPS :— Salter. 1859. 



Pterygotus stylops, Salter. Mem. Geol. Survey. Mon. I, 1859, p. 55, pi. xii, 



fig. 47. (Reproduced in our Woodcut, Fig. 24.) 



This remarkable small carapace has occurred to the assiduous search of Mr. R. Banks, 

 of Kington. 



Only the anterior part is preserved, and even of this the frontal portion between the 

 eyes is broken off; it was, perhaps, less prominent than the dotted line indicates. The 

 forward position and round form of the great eyes very much 

 assimilate the species to SI. acuminata; but without doubt it belongs to 

 the true Pterygotus (near, perhaps, to Pt. raniceps, from Lanarkshire, 

 see p. 71). 



The eyes are remarkably prominent and turgid, a slightly raised 

 fold of the carapace encircling them. A small tubercle, like that on / \ 



the same part in Pterygotus gigas, occurs on the median line of the '*— — -—-' 



head, and rather nearer to each eye than their distance from one FlG - 24,— Head of pter v~ 

 another (probably indicating the position of the ocelli). As only a 

 single broken specimen has occurred, it is useless to describe it further. There can be no 

 doubt of the distinctness of the species. 



Locality. — Kington, Herefordshire. Collection of Mr. R. Banks, of Kington. 



Figs. 25—27. Crustacean appendages, doubtfully referred by Mr. J. W. Salter to Pterygotus problematic™, Pt. arcuatus, Pt. 

 ludensis, or to one of the species common to the Ludlow Rocks. The ornamentation, when preserved, 

 resembles that peculiar to Pterygotus. Lower Ludlow Rock, Leintwardine. 



