OF WESTEEN SIND- 77 



inferiorly down to the rounded-oif and slightly projecting posterior rostral process. 

 The test is slightly longer than broad, and broader than high. 



The apical system is small and rather eccentric in front ; there are four genera- 

 tive pores ; and the madreporic body is placed centrally and is slightly prominent. The 

 ambulacra are small in relation to the surface of the test, do not extend beyond the 

 moderately convex upper surface onto the tumid sides, and are subequal, petaloid, and 

 do not close. They are nearly flush with the test. The interporiferous zones, slightly 

 above the level of the test, are broadest at the commencement of the distal third, and 

 are about double the width of a poriferous zone ; and their ornamentation is of a few 

 small tubercles in sunken scrobicules. The poriferous zones have the pores placed 

 rather obliquely, and the outer set are larger and more oval than the rounder 

 inner series. They are conjugate, and the costal ridges are granular. The pairs of 

 pores are close, and the plates of the ambulacra are numerous. The posterior lateral 

 petals are slightly the longest and contain the most pores; and the antero-lateral 

 petals diverge greatly, forming an angle of about 60°-66°. A row of numerous single 

 pores passes from each poriferous zone over the ambitus ; and the two rows forming the 

 extrapetaloid ambulacrum diverge on leaving the ends of the petals. 



The interambulacra are wide and conform to the slight convexity of the test ; their 

 ornamentation is of sparsely distributed tubercles in sunken scrobicules, the intermediate 

 surface being ornamented with granules which are often arranged in circles around the 

 scrobicules, or the spaces may be minutely punctated. 



There is a certain gibbosity placed longitudinally along, or rather posterior to, the 

 median suture of the interradial area between the antero-lateral and postero-lateral 

 ambulacra. 



The peristome is very small ; it is more eccentric in front than the apical system, 

 is pentagonal, with slightly re-enteringly curved bourrelets, and it is slightly longer 

 transversely than longitudinally ; and the floscelle is well developed. A wavy ornamented 

 rim projects downwards from the bourrelets and from the sides of the proximal part of the 

 phyllodes. The buccal ambulacra or phyllodes have open ends, which expand into the 

 long line of single pores, and they have supplementary pores and also central pits. The 

 ornamentation of the test is coarser actinally, and some of it is within the poriferous 

 zones of the phyllodes. 



The periproct is small, supra marginal, low down ; it is almost circular, or sur- 

 mounted by a slightly projecting ledge of the flat grooved keel; and there is a faint 

 groove leading from it downwards and forwards to be lost on the tumid posterior 

 rostrum. 



Length of the test 1 ^g inch, breadth l-j^^- inch, height 1 inch. 



Locality. Hills east of Lynyan, from .the gypseous shales in the Ranikot series. 

 Survey-number G fffj. 



There are many specimens of different sizes of this species in the collection. 



Some of these are from an uncertain locality, and are numbered G fff , but they 

 evidently belong to the same species and can hardly be called varieties. 



M 



