OF WESTEKN SIND. 241 



We have also stated that in the examples of this species from Kachh no indications 

 of the peripetalous fasciole were discernible ; in the specimens from the Khirthar series 

 of strata in Sind we have, however, been more fortunate, and find in several instances 

 traces of this fasciole ; it is, however, the most feebly developed fasciole we have seen, 

 and is not more than two or three rows of minute granules in width, and we have in 

 no case assured ourselves that it is continuous ; the traces observed are entirely on the 

 abactinal surface, and do not support the supposition of d'Archiac and Haime that 

 the peripetalous fasciole was submarginal. The few Khirthar specimens are all more 

 or less badly preserved, and they accord closely with the type of the species. 



Dimensions. The largest specimen measures 30 millim. in length and 24 millim. in 

 breadth ; all are somewhat crushed. 



Locality. In the Khirthar series of strata : Karra range, south of Trak. Survey- 

 number ^. 



Illustrations of the Species in Plate XXXVIII. 



Fig. 15. Abactinal view of the test: natural size. 



16. Actinal view of the test: natural size. 



17. Longitudinal profile of the test : natural size. 



18. Portion of a lateral ambulacrum to show ornamentation : magnified. 



GENUS INDET. 



Gen. et sp. INDET. Plate XXXIV, Fig. 17. 



There is a fragmentary test of a large Spatangoid in the collection which baffles all 

 attempts at determination on account of its very bad state of preservation. From the 

 few guiding features that are observable we are inclined to think that this very unsatis- 

 factory fossil represents a new genus, the systematic position of which would probably 

 be under the subsection Brissina. The specimen has been drawn on Plate XXXIV, 

 Fig. 17, and a reference thereto will give a much better idea of the fossil than any 

 verbal description. The chief notable point is the character of the ambulacra, all of 

 which are situated in deep, sharply-defined grooves, those of the paired petals being of 

 equal breadth throughout, excepting close to the apex, and appearing to extend to the 

 margin. The antero-lateral petals are nearly horizontal. The odd anterior ambula- 

 crum is situated in a wider and even deeper groove than the others, which forms at the 

 ambitus a deep, sharply defined notch. A few pairs of pores at the apical extremity of 

 some of the poriferous zones may be seen, the inner series of pores are transversely 

 oval, and the outer series are still more elongate transversely, and with a tendency to 

 become pyriform ; the pores of a pair are moderately well spaced, and are united by 

 an indistinct conjugating furrow, and the divisional septa, in this part at least, are not 

 keeled. The abactinal surface was not very high, but slightly subconically convex, 

 springing with an arch from probably thin, abruptly rounded, margins, — the actinal 

 surface being apparently more or less plane. From an indication which remains near 

 the margin, the ornamentation in that region appears to have consisted of moderate- 



