OF KACHH AND KATTYWAE. 41 



and the lateral and subanal are very narrow and continuous, whilst there is a decided 

 enlargement in breadth of the peripetalous fasciole close to the end of the antero- 

 lateral ambulacra and quite in front. 



The periproct is elliptical in shape, longest in the vertical direction, and it is 

 placed immediately beneath the end of the posterior median keel. 



Length of large specimen 27 millim., breadth 22 millim., height 18 millim. ; length 

 to breadth 1 : 0"8, length to height 1 : 0'66. 



Locality. Kachh. From a canon in Nummulitic rock between Maniara-Fort hill 

 and Karray, about three miles east of Bair. Survey-number C 080 Cf. 



Illustrations of the Species in Plate V. 



Fig. 5. The test from above: natural size. 



6. The test, side view : natural size. 



7. The test, actinal view : natural size. 



8. The apical system, ambulacra, and part of fasciole : magnified. 



A large and considerably injured Spatangoid is in the same bed as that just 

 described. Its measurements are : — Length 58 millim., breadth 47 millim., height 44 

 millim. It appears to be an adult form of the above, but the apical system is 

 slightly more in front than in the others. 



Fig. 9. A side view: natural size. 



Genus PEEIPNEUSTES, Cotteau, 1875. 



A well-marked species of this genus, which was first of all noticed by Cotteau in 

 the Tertiary deposits of San Bartholomew in the West Indies, is in the Nummulitic 

 zone of the Kachh Tertiaries. The following is the generic diagnosis of Cotteau : — 



Test long, swollen, more or less cordiform. Apical system excentric in front. An- 

 terior groove notching the margin strongly. Anterior ambulacrum difi'erent from the 

 others, and formed of simple small pore's. Paired ambulacral areas petal oid, narrow, long, 

 sunken, nearly equal in length, the posterior being usually longest. Poriferous zones 

 with small rounded pores near the summit, becoming larger, subtransverse, and 

 conjugate further out. Tubercles unequal on the upper surface, some large and 

 distinct, and others closer, more abundant, and homogeneous. Large tubercles closely 

 circumscribed by the peripetalous fasciole. Peristome transverse, bilabiate, very 

 excentric in front. Periproct oval, largely open, placed at the summit of the posterior 

 end. Apical system compact. Four generative pores, the anterior pair closer than the 

 posterior. Peripetalous fasciole broad, strongly angular ,• subanal fasciole annular. 



In this definition some family characters and others of a specific value predomi- 

 nate. The distinctive structures of this Spatangoid are the nearly equal petals, the 

 large abactinal tubercles included by a peripetalous fasciole, and the presence of a 

 subanal fasciole. 



G 



