OF WESTERN SIND. 341 



towards the apex ; from this point they contract gradually and slightly towards the outer 

 extremity, which is not rounded or closed. At the apical extremity they contract 

 rapidly to a fine point. The petals reach about halfway between the apex and the 

 margin, and their course is straight. Their angle of divergence is about 66°, being that 

 included by lines drawn along the median line of the two petals. The intervening odd 

 posterior interradial area forms a rather low, but well-defined ridge, narrow for a short 

 distance from the apex, but rapidly becoming broader and disappearing in the generally 

 convex or arched posterior region. The character of the poriferous zones is similar to 

 that of the anterior pair of petals; the interporiferous area, however, is relatively 

 narrower, and the posterior poriferous zone is remarkably broad midway between the 

 extremities. 



The interradial areas have a slightly gibbous or arched character, and their respec- 

 tive, columns greatest in the anterior column of the anterior in terradia and the posterior 

 column of the postero-lateral interradia ; but, as far as can be judged from the imperfect 

 preservation of the fossil, the character does not appear to have been greatly 

 emphasized. 



Nearly the whole of the posterior extremity of the test is destroyed, but traces 

 remain which indicate that the periproct was rather high in position. 



The peristome is very excentric in front, but nearly the whole of the actinal surface 

 is destroyed or unfitted for description. 



Traces of two fascioles are present, a peripetalous and a latero-subanal. Judging 

 from the only clear trace of the latter which remains, it appears to have been very 

 narrow. The surface of the test is much too weathered to allow of any detailed account 

 being given of the course or position of these bands. 



The ornamentation of the plates is nearly all destroyed, but that on the abactinal 

 surface appears to have been small and widely spaced. 



Memarks. Notwithstanding the very unsatisfactory state of the single example 

 under notice, the details above given are sufficient to indicate that we are dealing with 

 a distinct species ; and on these grounds we have ventured to give it a name, although 

 the description is unfortunately imperfect. S. sufflatus is distinguished from S. Granti, 

 with which it is associated, by the altogether difiisrent marginal contour of the test, by 

 its more uniformly convex and less sloping abactinal surface, by the different form of 

 the paired petals, the antero-laterals wanting the characteristic curve at the outer 

 extremity, and by the relatively much longer and differently shaped postero-lateral 

 petals ; the character of the odd anterior ambulacrum is also different. 



Dimensions. Length of the test 40 millim., breadth 38 millim., height 26-5 millim. 



Locality. In the Gaj series of strata: Naig-Nai valley, twelve miles south of 

 Shah Ehui. Survey-number G ^4^0-- 



Illustrations of the Species in Plate XLIX. 



Fig. 7. Abactinal view of the test : natural size. 



8, Longitudinal profile of the test : natural size. 



9. Ambulacral plates in the odd anterior ambulacrum : magnified. 



