OF KACHH AND KATTYWAE. 45 



interradium more numerous and less definitely placed, small tubercles, still smaller 

 tubercles, and granules. The first kind of tubercles are fiat, low, truncated, crenulated, 

 conical bosses, surmounted by low mamelons, which, are fiat above and perforated ; 

 they stand in very shallow circular scrobicular spaces (often non-existent) surrounded 

 by a single circle of granules ; some are placed rather wide apart, and tubercles of the 

 second kind may intervene, or else the scrobicular series of granules may touch. 



In the posterior interradium the larger tubercles are very definitely placed on 

 either side of the median line, and near the apex there is a single row, one tubercle to 

 each plate, then two plates have two ; and the next plates on either side have three, one 

 being placed behind the others so as to form a triangle. Then small and large tubercles 

 are gradually added to succeeding plates to form widely open angular series, the point 

 being backwards ; so that with the increasing breadth of the plates the numbers of 

 tubeixles increase in the Vandykes. An indication of this style of ornamentation is seen 

 in the lateral interradia, the number of larger tubercles increases on each successive 

 plate from the apex to the fascicle, and the arrangement is in lines converging with 

 widely open angles. 



The anterior interradium has more numerous tubercles, and placed in irregular 

 rows in each plate, but much more sparingly near the apex than lower down. The 

 second kind, or smaller tubercles, also crenulate and perforate, are scattered generally 

 over the surface, and are fewest along the median lines of the interradia. The granules 

 are usually in circles around, the larger tubercles, and there may be considerable spaces 

 without them. 



Below the fascicle in the lateral posterior interradia there are no large tubercles, but 

 crowds of the second kind, which here and there are larger than the second kind above 

 the fascicle ; but in the anterior interradium there are tubercles below the fascicle 

 nearly as large as those above and crowded together. 



Actinally, the ornamentation consists in front and at the sides near the mouth of 

 large crenulate and perforate tubercles placed on fiat disks, nearer one side than the 

 other, crowded and environed by granules. Further back the dimensions of the 

 tubercles diminish and they are less crowded. 



Within the comparatively bare posterior ambulacra the plastron has its tubercles 

 increasing in size from the central keel, at a point anterior to the subanal fascicle, out- 

 wards and forwards. The tubercles are crowded below the anal groove and on either 

 side within the fascicle. 



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

 and Karray. Survey-number C 050. 



Illustrations of the Species in Plate V. 



Fig. 1. The test, side view : natural size. 



2. View from above : natural size. 



3. The apical system : magnified. 



4. Part of the posterior ambulacrum and fascicle : magnified. 



