OF WESTERN SIND. 27 



1. Phyllacanthus Eanikoti, sp. nov. Plate V, Figs. 9, 10. 



There are fragments of three species of the subgenus Phyllacanthus in the 

 Ranikot series. The specimens of one species belong to an old and younger forms, and 

 in no case are they complete enough for a fair specific diagnosis. 



What can be well observed is as follows : — 



The ambulacra are slightly wavy, decidedly broad, and the poriferous zones are 

 sunken ; the interporiferous zone is at nearly the same level as the interradial plates. 

 The pores are conjugate, and each interporiferous plate has three small tubercles on 

 it : one, the largest of the three, is a small, broad-based one, with a mamelon, and 

 it is situated close to the plate bearing the pores ; the others are minute and separate. 



The ambulacral plates are numerous, and there are sixteen in contact with a large 

 interradial plate. 



The interradial plates, well separated by sutural markings, are faintly convex, and 

 have a large areola which occupies their larger part. The scrobicule is circular in out- 

 line, very slightly sunken at its margin, and the boss projects as a broad cone termina- 

 ting in a wide apex, on which is placed a small mamelon. Crenulation occurs on the 

 grooved apex around the base of the mamelon, which is perforate. 



A circle of distinct, small, broad-based tubercles, sixteen to twenty in number, is 

 around the scrobicule ; they are decidedly larger than those of rest of the ornamentation, 

 which consists of two kinds of small tubercles. One, rounder than the other but more 

 or less elongate, fits in more or less between the larger tubercles just mentioned ; and 

 the other kind consists of small elongate granulations, which radiate from the scrobicular 

 circle of larger tubercles to the sutural marking. The larger scrobicules are rather 

 close together above and below, and they are separated by the suture and a few 

 minute tubercles, besides the rows of larger ones. But the smaller plates carry a few 

 large and small ornamental tubercles near the suture, on the other side of which some 

 little amount of space is occupied by the elongate ornamentation beyond the scrobicule. 

 The median interradial region is slightly sunken, and the oruamention is only moderate 

 in extent. The test appears to have been rather a high one. 



The scrobicular circle of separate, small, tubercles is a striking feature in this 

 species, as is also the fact of there being six vertical rows of minute tubercles in the 

 interporiferous zone, which, of course, is broad. The great number of pores in relation 

 to a large plate is very remarkable. 



Locality. Eanikot series, in the higher part of the gypseous marls from hills east 

 of Lynyan. Survey-number G -fl^r* • 



Illustrations of the Species in Plate V. 



Fig. 9. Phyllacanthus Eanikoti, sp. nov. The plates : natural size. 



10. An interradial plate, with a portion of an ambulacrum : magnified. 



2. Phyllacanthus Sindensis, sp. nov. Plate V, Figs. 11, 12. 



There is a fragment of a Cidarid in the collection, consisting of four interradial 

 plates and part of an ambulacrum, which appears to belong to the subgenus Phylla- 



