OF WESTERN SIND. 171 



bombous on the outer part of the median line over the posterior rostration, and is also 

 tumid to a considerable degree along the median line on the actinal part of the area. 



The ornamentation of the test is nearly wholly obliterated by weathering ; where 

 traces are preserved, the primary tubercles appear to be moderately well spaced, with 

 the intermediate parts comparatively broader, and the miliary granulation also com- 

 paratively larger than usual. 



The peristome is large, transversely oval, and is slightly excentric in front. A 

 faint swelling is present in the anterior peristomial plates, but otherwise bourrelets are 

 not developed. Incipient phyllodes are distinctly formed. 



The periproct is large, transversely oval, and entirely upon the actinal surface, the 

 plane of the orifice, however, being at a small angle to the plane of the actinal area, in 

 consequence of the median tumidity of the actinal portion of the odd interradium. 



Eemarks. The alliance of this form is exceedingly close to H. silensis, Desor, and 

 we feel some hesitation in separating it specifically. It is distinguished by the more 

 pyriform outline, which is more contracted posteriorly and with a more prolonged 

 rostration. The height is rather less and the dorsal surface more convex, the posterior 

 interradium sloping continuously from the apex, and not being so high or fully rounded as 

 in E. silensis, and the angle inclosed by the anterior pair of petals is also perhaps rather 

 smaller. The actinal surface appears to be more generally concave and the peristome 

 slightly more excentric. The miliary granulation is also comparatively coarse for the 

 genus, whilst that of E. silensis is described as very fine. On the cumulative weight 

 of these numerous small differences, we prefer to place the solitary specimen from 

 Sind provisionally as a separate species, rather than draw the momentous conclusion of 

 a more direct faunatic alliance upon such scanty material. 



Dimensions. 



millim. 



Length of the test 27 



Breadth of the test ... 22 



Height of the test . . 13 



Greatest width of the postero-lateral petal .... 2-5 

 Width of the interporiferous area at this place . . . 1*35 



Transverse diameter of the peristome 5"5 



Longitudinal diameter of the peristome 3-25 



Transverse diameter of the periproct 5-75 



Longitudinal diameter of the periproct 3-25 



The proportion of breadth to length, 0-81 : 1. 

 „ „ height to length, 048 : 1. 



Locality/. In the Khirthar series. Baili, west of Tong. Survey-number^. 



Illustrations of the Species in Plate XXX. 

 Fig. 16. Abactinal view of the test : natural size. 



17. Actinal view of the test: natural size. 



18. Longitudinal profile of the test : natural size. 



