CYPRIDELLINA. 27 



1. Cypridellina clausa, Sp. nov. Plate III, figs. 2 a, b, c. 



Carapace roughly egg-shaped ; suboblong in side-view ; sloping in front, obscurely 

 notched (broken below in the specimen) ; hinder margin apiculate and strongly indented. 

 Tubercle large, but not prominent. Edge-view subacute-ovate. Fig. 2 b shows the 

 ventral aspect of this injured specimen ; its dorsal aspect would be much like fig. \% b, 

 but more pointed behind, and showing the posterior depression. End-view sub- 

 pentagonal. 



In some respects this resembles Cypridinella clausa, Plate III, fig. 3, p. 23 ; but without 

 the swelling of the tubercles its end-profile would have been orbicular instead of oval ; 

 and its notch is higher and more horizontal. 



Length \ (probably more) ; height 2^ ; thickness -^ inch. Proportions 7^ : 5 : 5. 



A grey limestone cast from Little Island, Cork. Collected by Mr. J. Wright, F.G.S. 



2. Cypridellina Burrovii. Sp. nov. Plate III, figs. 4 a — e ; figs. 5 a — c; figs. 



21 a—e. 



We have here individuals of one species at three stages of growth, well preserved as 

 far as internal casts can serve, and well illustrated for comparison ; fig. 5 retaining 

 portions of the shell. The smallest (youngest ?) form, fig. 4, is subovate in profile ; the 

 largest "(fig. 21) is ovate-oblong; less boldly curved above and below, more apiculate 

 behind, and with a relatively smaller notch and gape than the other. Both are sub- 

 oviform, with subhexagonal end-view, and pyriform edge-view ; and each had posterior 

 spines, as they retain the cast of their united base, which, however, in fig. 4 d, is rather 

 higher up than in fig. 2 1 e. The prow, also, of fig. 4 c projects somewhat further beyond 

 the beak than in fig. 21c, and the hind-quarters of fig. 21 e (the largest specimen) are 

 rounder than those of fig. 4 d. 



None of these differences, however, in the presence of the many similarities, can be 

 of specific importance. Moreover, there is the intermediate form presently to be described ; 

 and we have, besides, an individual, still smaller than fig. 4, of the same form from 

 Ireland, which is rather more apiculate behind, and two middle-sized specimens (smaller 

 than fig. 5) from Settle, whence the three figured fossils came. From M. Bosquet's 

 Belgian collection, also, we have been favoured with two casts, one in the grey and one 

 in the white limestone of Vise, similar to fig. 4. 



The specimen of intermediate size, fig. 5, has a subglobose, nearly egg-shaped 



