OF WESTEEN SIND. 169 



surface the odd posterior interradium shows a slight tumidity along the median line, 

 especially in the neighbourhood of the periproct ; and the tumidity extends partly 

 round that aperture on either side of the median line, excepting the outer margin ; in 

 this manner the rostrate character is greatly emphasized. 



The ornamentation of the test is unfortunately more or less destroyed in our 

 specimen. The primary tubercles are small, numerous, and uniform, entirely sunken 

 in small scrobicules; and the intermediate spaces are prominent, confluent, and, 

 although usually narrower than the width of a scrobicule, appear to be comparatively 

 wider than in JE. Sindensis. The increase in the size of the ornamentation on the 

 actinal surface is very slight. 



The peristome is large and pentagonal, with the transverse diameter greater than 

 the longitudinal, and its position is slightly excentric in front. The whole of the 

 actinal surface of the test has suffered to such an extent from weather action that no 

 observations are possible beyond those of the most general character. The anterior 

 pair of bourrelets were probably more developed than the others, and the phyllodes 

 were apparently quite insignificant, the ambulacrum being remarkably contracted in this 

 species, and without presenting the slightest phyllode-like expansion in the vicinity of 

 the peristome. Four or five inner pores are present in each column, sometimes borne 

 on plates equal in size to the adjacent plates, and sometimes on a small intercalated 

 wedge-shaped plate, which does not reach the outer margin of the ambulacral zone 

 (see fig. 15). On all the ambulacral plates of this inner portion of the zone a small 

 prominence or lip occurs over the pore, which gives a sort of imbricating character to 

 the plates. 



The periproct is large, transversely oval, and situated entirely on the actinal 

 surface ; a slight rounding of the posterior rostration being visible on the outer margin 

 of the aperture when the test is viewed from below. 



Remarks. The nearest ally of this species is probably E. Sindensis. It is, however, 

 distinguished from that form by the more elongate test with a more oval margin — ^which 

 is also more contracted and more definitely rostrate behind — by its lower apex, and by 

 the more uniform curves of the dorsal convexity. It is still more conspicuously 

 characterized by the highly flexuous ambulacral petals, by the general concavity of the 

 actinal surface, by the more anteriorly excentric peristome, and by the different pro- 

 portions of the surrounding parts of the test. After careful study we have considered 

 that these differences warrant the separation of the form above described as a distinct 



species. 



Dimensions. 



millim. 

 Length of the test 98-5 



Breadth of the test 76-5 



Height of the test 39-5 



Greatest width of the postero-lateral petal .... 10 



Width of the interporiferous area at this place . , 5'25 



The proportion of breadth to length, 0-77 : 1. 



height to length, 0-40 : 1. 



