OF KACHH AND K ATT Y WAR. 65 



to the anterior margin, and more decidedly backwards to the posterior truncation, which 

 is curved, concavity backwards, and ends below in the prominent termination of the 

 plastron. The marginal outline abactinally is heart-shaped and pointed behind ; and 

 actinally the breadth is greatest behind. The apical system is behind the centre and 

 in front of the narrow raised keel of the posterior interambulacrum. Two generative 

 pores are present. 



The anterior odd ambulacrum, widest and very deep in front of the apical system, 

 narrows and shallows towards the margin, and is continued over it close to the peristome 

 as a decided groove with a flat fl.oor. The pairs of pores are scanty in this last part of 

 the ambulacrum, but are numerous and close in the deeply-sunken portion. The 

 anterior lateral ambulacra are long, make an angle of 90°, are slit-like, and the sides 

 are widest apart distally. The direction of the narrowest part, which is close to the actinal 

 system, is more from behind forwards than further out. There is no overlap of the edges 

 or occlusion. 



The posterior lateral ambulacra are much shorter than the anterior, form an angle 

 of about 45°, are straight, narrow, and deep. 



The peristome is- large, transverse ; the anterior lip is slightly convex anteriorly, and 

 the posterior projects below its level. Large depressions for pores occur in the course 

 of the antero-lateral ambulacra near the mouth, and also at the origin of the odd 

 ambulacrum. The posterior ambulacral spaces are narrow near the mouth, and they 

 broaden posteriorly ; they are finely granulated. The plastron is narrow, projects 

 downwards, is convex from side to side, and very slightly so from before backwards ; 

 its ornamentation is regular, and radiates from the posterior projection to the front, 

 and the tubercles are large in front and gradually diminish in size posteriorly. 



The periproct is situated high up in the posterior truncation, is rather small, and is 

 elliptical in outline. The peripetalous fasciole is narrow, and clings to the edges of the 

 groove-like ambulacra ; and the lateral fasciole is very linear, and passes downwards and 

 backwards, reaching the projection at the bottom of the truncation and crossing far 

 below the periproct. The upper part of the truncation rather overhangs the lower. 



Length 26*5 millim., height 21 millim., breadth 25 millim. 



55 -ty 55 55 -to 55 55 ^" 55 



Locality. Miocene series of Kachh : Wamuti. Survey-numbers C 190, C 190 f. 

 Abundant. 



Illustrations of the Species in Plate VIII. 



Fig. 1. The test of a moderate-sized specimen : side view. 



2. Posterior view : natural size. 



3. Abactinal view of another specimen. 



4. Abactinal view of another specimen. 



5. Abactinal view of a large specimen. 



6. Outline of a small specimen : actinal view. 



