OF WESTEEN SIND. 125 



by the outer series of pores in a petal is lanceolate and widest about the middle of the 

 petal, and somewhat constricted, or less wide, at the outer extremity. The inner series 

 of pores form straight lines, which open out or diverge gradually in an increasing 

 degree from the apex to the extremity. The interporiferous area is consequently a 

 wedge-shaped band, its width being equal to, or only very little greater than, the pori- 

 ferous zone at the portion of the petal where this is widest ; but the width of the area is 

 doubled at the outer extremity of the petal. The pores of a pair are wide apart and 

 united by a very conspicuous furrow, the outer pores being elongate and the inner 

 pores round. The divisional costse are but slightly broader than the grooves, and are 

 ornamented with very minute granules, normally forming a single line, but frequently 

 becoming irregular from crowding and diminution in size. The ornamentation of the 

 interporiferous area is close and compact, uniform with that of the interradial areas, 

 the tubercles being numerous. From the extremity of the petal the poriferous zone is 

 continued by a series of single pores placed in well-defined depressions which converge from 

 the ambitus to the peristome ; and the interporiferous area is very deeply and rather 

 suddenly troughed or depressed near the peristome, giving great prominence to the 

 bourrelets. Just before this depression of the ambulacral area commences the pores 

 fall into double series, although there is some irregularity in their position, and a few 

 additional pores are sometimes present. The bourrelets are large and conspicuous, 

 and are emphasized by the depression of the ambulacral areas above mentioned. The 

 bourrelet of the odd posterior interradium is large and broader than the rest, whilst 

 the two anterior bourrelets are slightly more elongate and prominent than the posterior. 

 The tuberculation of the bourrelets is larger than that of the test generally, but the 

 tubercles become smaller and more crowded on the sides of the bourrelets and on 

 the peristomial margin. The peristome is subcentral, pentagonal, and very deeply 

 incised. 



The periproct is elongate, elliptical, encroaching almost as much on the margin 

 as on the actinal surface, to the plane of which its position is oblique. The margins 

 of the aperture are rather deeply and sharply rounded inward. An almost naked 

 band, along which the intermediate miliary granulation is more or less confluent, 

 occupies nearly the whole of the median line of the odd posterior interradium 

 between the periproct and peristome. 



The tuberculation of the test is small, uniform, crowded, and compact. The 

 primary tubercles are small, equal-sized, sunken in deep scrobicules, so tliat the 

 mamelon of the tubercle and the intermediate miliary space are on the same level. 

 The scrobicules are equidistantly spaced, and the intermediate miliary space is less 

 than, or at most only equal to, one half the diameter of the scrobicule. Although 

 usually worn, there are some perforated and crenulated tubercles to be seen. 



BemarJcs. This species differs from Conoclypeus Sindends, nobis, from the 

 Ranikot series, in its shape and the construction of the ambulacra ; and from C. Delor 

 nouei, de Loriol, from Egypt, by the shape, by the width of the peristome, and by the 

 width of the interporiferous areas. 



