OF KACHH AND KATTYWAR. 61 



Illustrations of the Species in Plate XII. 



Fig. 7. The abactinal surface : natural size. 



8. The actinal surface : natural size. 



9. Plates near a lunule : magnifiisd. 

 10. Side of the peristome : magnified. 



Suborder ATELOSTOMATA. 

 Family CASSIDULIDJE. 



Subfamily EOHINOLAMPINJE. 



Genus ECHINOLAMPAS, Gray, 1825. 



The diagnosis of this genus has been given and considered on a former page. 



The Miocene series of Kachh contains numerous specimens of a species of 

 JEchinolampas which is closely allied to the recent species. 



The measurements indicate that in height, breadth, and length the forms are 

 nearer Echinolampas Hellei than EcJiinolamjpas oviformis ; but the apical system is more 

 excentric anteriorly than in either of the living species, and the structure of the peri- 

 stome differs. Under the circumstances, we place the forms provisionally in a new 

 species. 



1. EcHiNOLAMPAS Indica, Duucan & Sladen. Plate IX, Figs. 1-10. 



The test is long, broadest on a line with the end of the posterior poriferous zone 

 of the posterior ambulacra, not very high, swollen at the margin, very broadly curved 

 anteriorly from the small, very exce^ntric in front, apical system ; it slopes very 

 slightly behind for some space, and then more so to the slightly projecting posterior 

 edge, which overhangs the periproct. Behind the position of the greatest breadth the 

 test is somewhat nipped-in. On the actinal surface the angularity produced at the 

 greatest breadth is evident ; the surface is slightly convex from the margin to near the 

 peristome, which is in a slight yet definite depression. The peristome is rather large 

 and pentagonal; it is open and deep, and its front lip is on a line with the apical 

 system. The bourrelets are small, low, broad, and are covered with a smaller orna- 

 mentation than just beyond, and it resembles that of the walls of the peristome. The 

 phyllodes are petaloid and are in very slight depressions, and the doubling of the pores 

 and the central line of minute tubercular ornamentation are evident. The anterior odd 

 one is continued forwards, and has alternate large tubercles succeeded by" smaller and 

 more numerous ones near the ambitus. 



The apical system is small, button-shaped, projecting, and there are four genera- 

 tive pores ; madreporic body central. 



The ambulacra are petaloid except the odd one ; the poriferous zones are narrow, 

 and the interporiferous areas wide and nearly flush with the test. 



The anterior odd ambulacrum is much the shortest, does not close, and its breadth 



