26 THE TERTIARY FOSSIL ECHINOIDEA 



generative pores and a central madreporic body. The ambulacra are flush with the 

 test, rather unequal in breadth, the posterior being the broadest and longest. The 

 poriferous zones are narrow, and the interporiferous are broad, one being 2^ times the 

 width of a poriferous zone. 



The ambulacra are open, and the anterior shows no tendency to close, but all have 

 the distal ends of the perfect poriferous zones diminished in breadth. This is very 

 decided in the postero-lateral, and less so in the odd ambulacrum. The outer pores, 

 elongate elliptical, are larger than the inner and nearly circular pores, the grooves 

 between them are broad, and the costse are stout and placed rather obliquely. Coming 

 nearly to points, the poriferous zones of the odd ambulacrum are slightly unequal. The 

 posterior poriferous zone of the antero-lateral ambulacra has five or six pairs of pores 

 more than the anterior zone, which is less curved than the other, and yet both tend 

 (although the space between them is narrowed) to turn slightly away from one another. 

 The postero-lateral ambulacra are sinuous, and the poriferous zones come rather close 

 together at the end, the anterior being the longest. All the perfect zones stop well 

 short of the margin of the test, and a single series of pores passes over to the actinal 

 surface. The interradial areas are large from the great angle formed by the antero- 

 lateral ambulacra ; they are not tumid, and the posterior one is decidedly flattened near 

 the margin. 



The interporiferous areas and the poriferous zones are very nearly flush with 

 the test. 



The ornamentation of the interporiferous areas and of the interradials above the 

 ambitus is identical, and consists of equal -sized tubercles in sunken scrobicules, which 

 are separated by granular spaces. 



The actinal surface is tumid between the front and the peristome, and is less so 

 between this and the periproct. The test touches at these tumid points and not on a line 

 which passes transversely through the peristome, which is very slightly sunken. The 

 peristome is pentangular, longest transversely, and has small low bourrelets and rudi- 

 mentary phyllodes, consisting of a number of outer pores and a few inner ones. 



The periproct is close to the sharp edge, is inframarginal, larger than the peri- 

 stome ; is elliptical, with narrow ends, and is elongate transversely. Actinally the 

 ornamentation is slightly larger and more crowded. 



Length of the specimen 53 millim., height 32 millim., breadth 48 millim. 



Locality. Kachh. Near Wagka-padar, upper part of Nummuliticbeds. Survey- 

 number C 057 f. 



Illustrations of the Species in Plate II. 

 Fig. 1. Uchinolampas Kachensis, side view : natural size. 



2. Abactinal view : natural size. 



3. Actinal view : natural size. 



4. Part of an ambulacrum : magnified. 



