OF WESTERN SIND. 55 



Beyond the petaloid portion the ambulacra expand over the margin and contract 

 close to the peristome. A single series of pores is continued as the prolongation of a 

 poriferous zone, and the pores are close and numerous at the margin and as far as the 

 peristome, the plates being broad but low. At the peristome the ambulacra narrow 

 inwards, and have no doubling of the pores, but a slight departure from the serial lines, 

 and within the peristome there are two pores close together. The ornamentation of the 

 inter poriferous zones is of sparsely distributed sunken scrobicules with a small boss, the 

 intermediate parts being minutely granular. This ornamentation is closer at the margin 

 and larger actinally, and it becomes scantier at the low gutter-shaped area of the 

 ambulacra between the rudimentary bulging bourrelets. There is no true phyllode. 

 In one specimen there is an appearance of a double row of pores, but the inner rows of 

 pores do not penetrate, are more or less aborted, and each is overarched by a prominence 

 developed on the next aboral plate ; they appear to be depressions for sphseridia 

 (Plate XIV. fig. 1). 



The interradial areas are narrow at the apex ; and the ornamentation of the abactinal 

 part is of the same character as that of the interporiferous zones, but is scantier ; and 

 the granulation is more distinct, and it is closest and smallest at the margin, and largest 

 and scantiest actinally. 



The peristomial continuations of the interambulacra are slightly tumid, pass 

 upwards between the ambulacra there, and are covered with a minute crowded orna- 

 mentation of small bosses ; they constitute rudimentary bourrelets. The peristome is 

 transversely elongated, open, pentagonal, and the bounding lines are convex and tumid 

 inwards. Posteriorly, from the peristome to the periproct, is a median line of crowded 

 minute granules, a few sunken scrobicules and bosses being along it here and there. 

 The periproct is long, but distant from the peristome by more than its own length, 

 is close to the margin, is broadest posteriorly, and is surrounded by a crowded 

 ornamentation. 



There is some variation in the shape of the specimens of this species, and it mainly 

 relates to" the position of the greatest breadth. 



Localities. Eanikot series, Jhirak, north-east of Petiani, west of Kotri. Survey- 



numbers G f If 5, G Hf , G I 



26 

 64- 



Illustrations of the Species in Plates XIII & XIV. 



Plate XIII. 

 Fig. 4. The test, from below. 



i2 



