OF KACHH AND KATTYWAR. 19 



mentation and details are nearly the same, however ; and were there not abundance of 

 specimens of both kinds we should feel the difficulty of making this angular form 

 any thing more than a racial variety ; but it is a distinct species. 



The nature of the ambulacra, their continuous series of double pores, the intercalated 

 poriferous plates, the oblique peristome, and the position of the periproct ally Ambly- 

 pygus to Echinoneus, which is its modern representative. The genus Amhlypygus belongs 

 to the subfamily Echinoneinae. 



Subfamily ECHINOLAMPINJE. 



Genus ECHINOLAMPAS, Gray, 1825. 



The jspecies of this genus from the Nummulitic of Kachh are as peculiar as those 

 described bydeLoriol from Egypt*. Most of them are very tall and large, and look 

 like Conoclypei, but they have all the generic characters oiEchinolampas. The identity 

 of any species from Kachh with any one of those so admirably described by de Loriol 

 cannot be asserted ; but the alliances are close, and the mimeticism of the two faunas as 

 regards this genus is very remarkable. 



1, EcHiNOLAMPAS ALTA, Duucan & Sluden. Plate I, Figs. 1-6. 



The test is thick, large, high, helmet-shaped, with steep sides ; it is longer than 

 broad, and slightly broader than high. The highest point is central and behind the 

 apical system, which is slightly excentric in front, or at -yq of the distance from the 

 anterior to the posterior edge. The test slopes rapidly to the front, and is almost 

 vertical near the ambitus ; the slope is bolder and with a greater curve posteriorly, 

 where it includes the produced and subrostrated posterior interradium. The direc- 

 tion is very vertical near the margin posteriorly and laterally. Seen from the front, 

 the outline is almost hemispherical above and vertical on either side nearly to the 

 margin. 



The actinal surface is oval elliptical in outline, longer than broad, rounded in 

 front, less rounded and broadest on a line with the peristome, and narrower and slightly 

 piuched-in on either side of the rounded posterior part. The margins are rounded 

 off; they are sharpest on aline which passes through the peristome transversely, and also 

 on either side of the periproct. The peristome is slightly sunken, and the whole actinal 

 surface is slightly concave from before backwards, so that the test rests fore and aft, and 

 does not touch the surface which corresponds with the transverse line above mentioned. 

 There is a sensible swelling of the margin anterior to the lateral ambulacra, and it 

 is less, and more dependent in front of the postero-lateral. The test rests upon a 

 faintly swollen surface within the margin. 



The interradial areas, more or less vertical and evenly curved above the margin, 

 are tumid high up, and the posterior, more swollen than the others near the apical disk, 



* Op. cit. p. 88 (32). See supra, p. 14. 



d2 



