72 THE FOSSIL ECHINOIDEA 



are slightly concave at their interporiferoua zones ; and these portions contract within 

 and slope upwards into the mouth in flat stalk-like processes. 



The interambulacra end, actinally, in short, slightly downward-projecting, broad 

 processes or bourrelets, which are covered with an exceedingly delicate granulation. 

 They pass upwards, forming the sides of the peristomial pentagon, and are concave 

 externally between the phyllodes where they are in contact with the pitted spaces or 

 regions of large tuberculation. The posterior pitted space reaches the posterior margin 

 of the test, and diminishes gradually in width. 



The periproct is large, transverse ; and the broad edge of the slight posterior inter- 

 radial keel overhangs it. The floor of the periproct, slightly concave and broad, merges 

 into the posterior shelving process, which terminates in a rather sharp edge at the pos- 

 terior truncation of the test. 



Length of specimens. Breadth, Height. 



2yo inches. 1-^ inch. 1 inch. 



2-1% „ 1t^ „ not quite 1 „ 



_4. XX 



9 1_4. 



^ 55 -"-10 5' 12 



1_6_ 1_1_ _7_ 



-•^10 55 -"^lO 55 10 55 



Locality. North-east of Petiani, west of Kotri, Eanikot series (Survey-number 

 G Iff) ; also at Jhirak, Eanikot series (Survey-number G ff fs)- 



Variety. With a narrow interporiferous zone to the odd ambulacrum ; the test 

 more elliptical and larger behind than the type ; other structures the same. 



Several specimens of this variety occur ; and there is some variation in regard to their 

 height and breadth ; they are mostly smaller forms, but most are more than 1 inch 

 in length. 



Localities. South-west of Jhirak ; hills east of Lynyan ; from gypseous shales, 

 Jhirak. Survey-numbers G ||f , G f|§^, G f f f,-. 



These are all from the Eanikot group. 



Illustrations of the Sjpecies in Plate XVIII. 



Fig. 1. The test, from above : natural size. 



2. Side view: natural size. 



3. Transverse outline. 



4. Actinal surface : natural size, 



5. Apical system : magnified. 



6. Part of an ambulacrum : magnified. 



7. The floscelle : magnified. 



Genus PAEALAMPAS, gen. nov. 

 Test of small size, suboval, high, and convexly inflated above, greatest elevation 

 posteriorly eccentric ; slightly concave beneath, margins very tumid. 



