OF WESTERN SIND. 33 



sharp point ; they form rather indefinite scrobicular circles around the small tubercles; 

 and others are dotted about here and there, sparingly. Hence the ornamentation is 

 distinct, sparing, and unequal in the median area, and it passes in arcs on one side of 

 the great tubercles. 



Between the scrobicular circles of the interradials and the poriferous zones, the 

 ornamentation consists of a vertical series of small tubercles, unequal in size, and of a 

 few large miliaries. This ornamentation diminishes near the apical system, and a few 

 miliaries are seen near the poriferous zones. A similar diminution occurs near the 

 peristome in the ornamentation of this particular region. There are traces of an 

 indefinite ribbing down the flanks of some of the bosses of the interradial area, near the 

 poriferous zones. 



Dimensions. Breadth of the specimen 1-^^ inch ; height rather more than -^ inch. 



Locality. North by east of Petiani, west of Kotri. Eanikot series. Survey- 

 number G ?-|f . 



A second specimen is smaller than the type and evidently younger. The height 

 is \ inch, and the breadth I-^q inch. The ornamentation is less elaborate than that of 

 the type ; but the large miliaries of the plates near the apical system, in the interradia, 

 are better defined in their circular arrangement. The specimen came from the same 

 deposit as that just described. 



A small form clearly belongs to this species ; and the principal distinction is one 

 of age, and relates to the ornamentation, which is more scanty. 



Further, a small form has to be noticed ; and its value is in the preservation of the 

 peristomial margins. The peristome is small, and the cuts are very small. The pori- 

 ferous zone is simple, and the more or less arched series of pores is unigeminal, except 

 in one or two spots near the apex in some zones. It is from the same locality ; and the 

 dimensions are, breadth -j-q inch and the height ^ inch. 



Illustrations of the Species in Plate VII. 



Fig. 1. Cyphosoma abnormale, Duncan & Sladen. The side view of a large 

 specimen : natural size. 



2. The abactinal surface : slightly magnified. 



3. A small specimen : magnified 2 diameters. 



4. An ambulacrum of the large specimen : magnified. 



5. The interradial tubercles, near the ambitus, of the smaller specimen : 



magnified. 



6. The poriferous zone and the adjoining ambulacral and interradial plates, 



near the peristome, of the larger specimen : magnified. 



7. An interradial plate of the large specimen : magnified. 



2. Cyphosoma, sp. Plate VII, Figs. 8, 9. 



A small specimen of a rather worn Cyphosoma is in the Eanikot series collection, 

 and is from the same locality as the other forms. Its tubercles are small, and there 

 is not much distinction in size between those of the different areas. The pores are in 



