OF WESTERN SIND. 9 



large. The preservation of the specimens unfortunately renders any further details 

 unobtainable. Radioles unknown. 



Dimensions. Height of the larger specimen ys indi- Height of the smaller speci- 

 men ^ inch. Breadth -^q inch. 



Locality. Below Jakhmari peak, Laki range, west of Amri. Survey-number 



G 2 80 

 137' 



ItemarJcs. There are two specimens of this Cidaris, one small and without its 

 apical system, and the other more fully grown but more or less crushed. They belong 

 to the same species. 



Illustrations of the Species in Plate I. 



Fig. 1. The test, seen in profile: natural size. 



2. The same : magnified. 



3. A portion of the ambulacral area : magnified. 



4. Profile outline of the same. 



5. Tnterambulacral plate : magnified. 



6. A primary tubercle, seen in profile : magnified. 



7. A portion of the scrobicular ring, showing the shield-shaped boss of the 



tubercle and the tear-shaped mamelon : magnified. 



Order ECHINOIDEA EXOCYCLICA. 



Suborder ATELOSTOMATA. 



Family CASSIDUZIDM 



Genus PLESIOLAMPAS, gen. nov. 



Test oval, elongate, depressed, gently convex above, concave beneath around the 

 peristome ; actinal surface and margins tumid. 



Ambulacra subpetaloid, unequal, widely open at the extremities. Poriferous zones 

 almost straight, subequal. Pores round, subequal, the outer slightly elongate. 



Apical system compact, excentric in front. 



Peristome subcentral or slightly excentric in front, subpentagonal. 



Poriferous zones continued on the actinal surface in single pores ; a few supple- 

 mentary ones present near the peristome ; floscelle rudimentary. 



Periproct larger than peristome, inframarginal, oval, placed longitudinally. 



Tubercles numerous, small, non-mamillated, imperforate, non-crenulate, completely 

 sunken in deep, wide scrobicules ; miliary granulation compact. 



The genus to which the present form is most nearly related, is JEchinolampas, of 

 which, indeed, the fossil might at first sight almost be regarded as an abnormal species. 



c 



