OF WESTEEN SIND. 259 



The antero-lateral petals are very wide apart, are long, open, and the anterior 

 poriferous zone is straigbter than the other (5), which is curved. Both of these zones 

 become narrow towards the adoral end, the anterior is the shortest, and the last pairs 

 of pores of the posterior (b) curve slightly backwards. 



The posterior ambulacra, the longest, are slightly sinuous near the apex, then 

 straight and open ; the poriferous zones become narrower towards the margin and are 

 of equal length. 



The ornamentation of all the interporiferous areas is of the same size as that of 

 the interradia, but is closer. The lateral interradia are the largest. 



The actinal surface of the test is depressed from the centrally placed peristome to 

 about two thirds of the distance to the margin, where a tumid condition occurs, so that 

 the test rests on a surface within the margin, which overhangs. 



The peristome is large and pentangular in outline, and its breadth is not much 

 greater than its length. The anterior bourrelets are distinct and large, and covered with 

 a tuberculation which diminishes in size towards the inner part ; the lateral are smaller, 

 and the posterior (the broadest) is not so prominent as the anterior. The phyllodes are 

 not very distinct, but they are slightly petaloid, narrow, tuberculate, and marked with 

 the usual poriferous depressions, but not with extra plates. All around the peristome, 

 beyond the bourrelets the ornamentation is large, and larger than elsewhere. Beyond 

 this area of large ornamentation the tubercles become crowded and smaller to 

 the margin, where they are only slightly more crowded than abactinally. The 

 ornamentation between the margin and the apex consists of tubercles in sunken 

 scrobicular areas surrounded by a raised margin, which is more or less finely granular. 



The periproct is about as broad as the mouth, is infra-marginal and transversely 

 elliptical, being much broader than long. 



Dimensions. Length 59 millim., breadth 53 millim., height 19 millim. ; distance 

 of apical disk from anterior edge 24 millim. Eelative length to breadth 1 : 0*98 ; 

 relative length to height 1 : 0*32. 



Locality. Nari series. Neighbourhood of Laki. The fossilization is the same as 

 some specimens of Ccelopleunis equis. Survey-number G -4^9-. 



Illustrations of the Species in Plate XL. 



Fig. 5. The abactinal surface. 



6. The actinal view. 



7. Side view. 



2. EcHiNOLAMPAS d'Aechiaci, Duncan & Sladen. Plate XL, Figs. 8 & 9. 



The test is long, ovoid, depressed, tumid in front, nipped-in and sharper behind. 

 It is longer than broad and broader than high, the relative proportions being length 1, 

 breadth 0-87, and height 0-43. 



The highest point is excentric in front, slightly in the rear of the apical 

 disk ; thence the test slopes boldly in front and gradually posteriorly, there being a 



