OF WESTERN SIND. 295 



is slightly raised above the general level of the interradium, and there is often a raised 

 discontinuous ridge bounding the outer part of each plate up to the apex. This ridge 

 often has a furrow on the median side of it. The granules and the small secondaries are 

 comprehended in a slightly raised surface near the poriferous zones and external to 

 the zigzag ornamentation of the rest of the plates. 



Large tubercles commence on the eighth plate from the apex as a rule ; but there 

 is variation on the same test in this respect. There are usually six decidedly large 

 primaries, and the tubercles become gradually smaller and smaller to where they are 

 crowded above the peristome. 



The coronal plates just above, at, and below the ambitus, are not only well 

 furnished with distinct and large granules around the edge of the base of the tubercles, 

 especially aborally, adorally, and along the median sutural lines, but there are also small 

 and well-developed secondaries in the median line, and especially at the junction of the 

 other sutures with it. Above the first large tubercles there is, in well-preserved speci- 

 mens, a very considerable granulation. The shape and size of the primary tubercles is 

 the same as in the ambulacra. 



It is evident that this species can be distinguished by the granulations and small 

 secondaries of the median part of the interradia, by the numerous small secondaries on 

 the oblique part of the coronal plates, by the almost total absence of tubercles above 

 the zone of greatest width, by the continuance of small tubercles to the top of the 

 ambulacra, and by the tumid and large test. 



JDimensions. Height of large specimen 21 millim. ; breadth 38 millim. 



Localities. Gaj or Miocene of Sind : Pir Gaji, W. of Sehwan ; Tandra Rahim 

 Khan, W. of Sehwan ; Gandack Hill ; hill-scarp five miles N. of Shah Rhiii, on the 

 Naig Nai, S.W. of Jang^ra, Naig Nai valley ; Mendiari, 35 miles N. of Karachi. 

 Survey-numbers G \\^, G \%^ G ^^-i; G ^i^, G ^i-^, G ^i-^^, &c. 



Illustrations of the Species in Plate XLVl. 



Fig. 1. The test, side view. 



2. A test more tumid than the other. 



7. The aboral part of an ambulacrum : magnified. 



9. Peristomial part of ambulacrum : magnified. 



The drawings of the great tubercles of Coelopleurus Pratti, d'Archiac, on Plate 

 XXXIX, Figs. 7 and 12 (Nari Series), are also exact representations of the worn and 

 weathered specimens of Coelopleurus Forbesi, d'Archiac. 



C(ELOPLEUKtTS FoEBESi, d'Archiac & Haime. Premature form. 



A young form (Plate XLVI, Fig. 4) is 11-5 millim. in breadth and 6 millim. in 

 height. The test is tumid at the ambitus, slightly conical above, rather pentagonal in 

 outline when seen from above, and rather incurved actinally, where the peristome is 

 moderately large. 



