OF KACHH AND KATTYWAR. 21 



line with the direction of the ambulacra), become more numerous, two and three rows 

 existing. The rows are placed obliquely ; and it appears that in some instances there are 

 extra plates. Traces of pits occur near the peristome between the lines of pores ; and 

 each ambulacrum ends in two large pores, which are well within the peristomial margin. 



The interporiferous zones actinally have a slightly larger ornamentation than 

 abactinally, but of the same kind ; they narrow near the peristome, and become gutter- 

 shaped more or less, owing to the tumidity of the bourrelets. 



Actinally the interradia are well developed, and they form a considerable part of 

 the peristomial margin, where they are slightly tumid, project, and bound the trans- 

 versely elongate pentagonal aperture. The bourrelets of the lateral interradials are the 

 smallest, the others being larger, broader, and more projecting and subequal. The 

 ornamentation of the actinal part of the interradials increases in size from the margin 

 to close to the peristome, where it again becomes crowded and covers closely the bour- 

 relets and their ascending processes within the peristome. A trace of wearing occurs in 

 the median line towards the periproct. 



The peristome is large, pentagonal, transverse, subcentral, is on a higher plane 

 than the margins in front and behind, and nearly on a level with the margin posteriorly 

 to the antero-lateral ambulacra. It is deep, and bounded by a vertical tube-like process 

 of the test formed mainly by the interradia. The depth is at least 6 millim. There are 

 no auricles or teeth. 



The periproct is large, transversely elliptical, rather larger than the peristome, close 

 to the posterior edge of the test within the margin, and occasionally transgresses on it ; 

 it looks downwards and a little backwards. The large ornamentation of the actinal 

 surface of the posterior interradium becomes smaller and closer around the periproct. 



Abactinally the distinct and rather wideapart interradial ornamentation resembles 

 in details and point of size that of the ambulacra ; but the tubercles become crowded 

 and smaller near the margin, and actinally the crowding persists, the tubercles being 

 larger also. 



The length of the test is 89 millim., and the greatest breadth is 70 millim. ; the 

 height is 67 millim. ; so that the proportional measurements are — length 1, breadth 

 0-786, height 0-75. 



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

 Karray, about three miles east of Bair. Survey-number C 050. 



Illustrations of the Species in Plate I. 



Fig. 1. Echinolampas alta, Duncan & Sladen. Side view : natural size. 



2. Actinal view : natural size. 



3. Apical system : magnified twice. 



4. Peristome: magnified. 



5. The antero-lateral ambulacrum, near the margin : magnified. 



6. Ornamentation of ambulacrum : magnified. 



