from the Silurian Rocks. 159 



8. C. ? ensis, n. sp. 



Telson magnum, 6-unciale, compressum, ad basin bulbosum, ensi- 

 forme ; apice incurvo, margine dorsali crenato-serrato, lateribus 

 planis nisi utrinque costa valida subcentrali ornatis. 



In all probability this is the telson of a remarkable species ; 

 for it has the bulbous base ; but it is so compressed laterally as 

 to be almost flat, and towards the end is curved down into a 

 sabre-shape. The breadth is greatest near the base, the tip 

 rather blunt. A lateral ridge, nearer the dorsal than the ventral 

 edge, runs two- thirds along each side from the apex, but does not 

 reach the bulbous base. 



Locality. Leintwardine, Shropshire ; Lower Ludlow rock. 



9. C. vesica, n. sp. 



C. parvulus, biuncialis, lee vis, capite pyriformi, inflate, corpore te- 

 nuissimo abbreviato. Cephalothorax late ovatus, apice angusto, 

 margine dorsali valde curvo. Segmenta corporis libera 5, quorum 

 ultimum longe maximum. Appendices attenuate. 



This curious bladder-like species may very likely become the 

 type of a new genus, in which case 

 Physocaris would seem appropriate. 

 The posterior edge is not at all 

 truncate, the dorsal margin is much 

 curved, and the anterior end narrowed 

 and with a small beak. Cerat. (Physocaris) vesica. 



10. C. cassia, n. sp. 



C. sesquiuncialis, oblongus, striatus, corpore brevissimo. Cephalo- 

 thorax oblongus, antice rotundior, postice truncatus falcatus, lineis 

 subrectis remotiusculis. Segrnentum ultimum (solum liberum) 

 corporis angustum, appendicibus brevibus. 



The oblong shape of this obscure fossil would not be quite 

 sufficient to found a species on, though it distinguishes it from 

 most others. The greatly abbreviated body, showing but one (?) 

 joint beyond the carapace, and with very short appendages, is a 

 better character. 



Loc. Lower Ludlow rock, Leintwardine. 



One other fossil must be noticed here, as it has figured pro- 

 minently in the original description of the genus by M'Coy. 

 The C. solenoides of that author (/. c. pi. 1 E. fig. 5) is really a 

 species of Solen or an allied genus, as I at first supposed and classed 

 it accordingly as Solenomya, Cultellus, or an allied genus. (See 

 Prof. Sedgwick's Lists of Kendal Fossils: Wordsworth's ' Letters 

 on tlie Lakes/ 1843-1846, Appendix.) I have nowhere given it 



