OF WESTERN SIND. 127 



septum is ornamented with a single row of miliary granules. The ornamentation of 

 the interporiferous area is uniform with that of the rest of the test, and is well spaced. 

 The poriferous zones pass over the ambitus as a single series of pores, and these 

 converge towards the peristome. On the inner third of the zone, the pores fall into 

 double series, placed obliquely, but often irregularly, and with some additional pores. 

 The inner extremity of the ambulacrum is depressed and forms a constricted trough 

 down to the peristome, which greatly emphasizes the bourrelets. The bourrelets are 

 very large and tumid, the two anterior being the broadest and most prominent, 

 whilst the two posterior laterals are the most pointed and least prominent. In the 

 neighbourhood of the bourrelets the tuberculation is larger than elsewhere, but 

 becomes smaller and more crowded down the sides of the bourrelets and up to the 

 margin of the peristome. 



The peristome is large and slightly excentric in front. The periproct is elongate, 

 elliptical, and entirely on the actinal surface, but close to the posterior margin of 

 the test. 



The tuberculation of the test is rather large and more widely spaced than in the 

 preceding species, the intermediate miliary space being frequently greater than the 

 diameter of the scrobicules, the depth of these being also less than in the previous form. 

 On the actinal surface the tuberculation is larger and more crowded. 



Bemarks. This species is readily distinguished from its congeners by the plump 

 well-rounded abactinal surface, by the great breadth of the ambulacra, and by the 

 character of the ornamentation. 



A fragmentary fossil of a small and badly-preserved test we refer with some 

 hesitation to this species. The marginal contour is more rotundly oval ; and the 

 outline of the abactinal surface, as seen in longitudinal profile, shows the slopes to be 

 somewhat less full and convex than in the type. As the other characters of the test 

 accord sufficiently closely with the form now described, the differences may not 

 improbably be attributable to age only. 



Dimensions. 



millim. 



Length of the test 94 



Breadth of the test 80 



Height of the test 56 



Breadth of the petal at its widest part 15 



„ „ outer extremity 11 



Breadth of the poriferous zone at its widest part . . . 3 '75 



Localities. In the Khirthar series of strata : — i. Baili, west of Tong. Survey- 

 number ^. 



ii. A young example, which we refer to this species, was presented to the 

 Geological Survey ; the exact locality was not known, but said to be near Kotri, 

 probably the hills west of Kotri. Survey-number ^^. 



s2 



