32 THE TERTIARY FOSSIL ECHINOIDEA 



Actinal surface subplane and barely depressed centrally. The peristome is central, 

 and the periproct inframarginal and close to the edge. The tubercles are small, close, 

 equal. 



Length 75 millim., breadth 60 millim., and height 25 millim. The relative 

 dimensions are — length to breadth as 1 : 08, and length to height as 1: 0-33, 



Eemarks. The test is broader posteriorly to the centre than elsewhere, and it 

 is rather fiat behind and above the periproct. According to figure 2 b the posterior 

 margin is as tumid as the anterior, and certainly the apex is behind the anterior 

 one-third. 



The petals are not very broad ; the antero-lateral are nearly hidden, and the ter- 

 minations are not visible. The posterior are long, straight, and there is very little 

 difference betvpeen the lengths of their poriferous zones. The specimen and the descrip- 

 tion do not agree. 



The type of the other species, Echinolampas Vicaryi, is defective in the posterior 

 part of the test, and was founded on one specimen only. The following is the specific 

 diagnosis (page 213, plate xiv, figs. 4 «, 4 5) : — The test is elliptical and slightly 

 elongate, with a contour slightly angular posteriorly and but slightly high. Apex but 

 slightly projecting, and situated at two fifths of the long diameter from the front. The 

 ambulacral petals are large, rather broad, straight, plane, narrowed near their ends, but 

 slightly unequal. The poriferous zones are moderately broad, rather curved, and in 

 the posterior ambulacra the outer zone is the largest, whilst in the antero-lateral the 

 posterior is the larger. 



The lateral interradia are the largest inferiorly. The actinal surface is depressed 

 towards the centre and raised behind. The peristome is placed anteriorly to the centre ; 

 and the buccal petals are very distinct, and rather contracted distally. The tubercles 

 are very small, close, and those near the mouth are the largest. 



Length \ but it is stated 58 millim., breadth 50 millim., and height 25 millim. 



There are three indifferent specimens of oval and elliptical depressed Echino- 

 lampads in the collection from Kachh. Two probably belong to the same species, which 

 cannot be either of those described by MM. d'Archiac and Haime. The third is to 

 all appearance Echinolampas Vicaryi. Of the first two, one is so marked in its 

 anterior and antero-lateral petals that we have figured it without giving it a specific 

 designation. 



9. EcHmoLAMPAS, sp. Plate III, Fig. 7. 



A flat, elongate elliptical Urchin, with apical system in front of the centre and a 

 large transversely elliptical periproct close to the posterior margin. The anterior 

 ambulacrum is long, showing the faintest tendency to close not far from the margin • 

 It IS broad, with sunken broad poriferous and raised interporiferous zones. Poriferous 

 zones with numerous pairs of pores, the inner pore being circular or oval, and the outer 

 long and smaller; the cost^ are distinct and rather small, and the right zone is longer 

 than the other. The terminal pairs of both zones are slightly turned in, and the others 



