OF WESTERN SIND. 129 



presents some variation in form when compared with the type. The breadth is rather 

 less in relation to the length, the marginal contour is more angular in the region of the 

 anterior interradia, the posterior rostration is more produced, and the depressions in 

 which the petals are placed are less marked than in the type. In all other points the 

 correspondence is close ; and we see no reason to separate the form from C. rostratus. 

 A very much weathered specimen from Rois Hill, south of Damaj, we also refer to 

 this species, although not without reservation. The general form of the test is well 

 preserved ; but all detail on the abactinal surface is lost, hence definite comparison is 

 impossible. The actinal surface is well preserved. The test is smaller than the type, its 

 marginal contour is on the whole more regularly oval, and, from the general appearance 

 of the fossil, we are led to believe that the ambulacral depressions were very faint. 



Dimensions. 



a. h. c. 



millim. miUim. millim. 



Length of the test 100 96 87 



Breadth of the test 83 74 72 



Height of the test 48 53 45 



Width of one of the paired petals . . 15 14*5 12-5 C?) 



Localities. Khirthar series of strata: — i. Hills east of Trak. (Locally highest 

 beds of the group.) Survey-number -^j-. 



ii. Not found in place, but referred to the same locality. Survey-number 5^. 

 iii. Eois Hill (east flank), south of Damaj. Survey-number ^^• 



Illustrations of the Species in Plate XXIV. 



Fig. 1. Abactinal view of the test : natural size. 



2. Longitudinal profile of the test : natural size. 



3. A portion of the left posterior ambulacral petal at its widest part: 



magnified. 



4. Terminal extremity of the same petal : magnified. 



4. CoNOCLTPEus GALEEUS, Duncan & Sladen. Plate XXIV, Figs. 5-10. 



Three fragmentary tests of a well-defined species of Conoclypeus occur in the 

 collection of Khirthar fossils. Unfortunately none of the specimens are sufficiently 

 well preserved for a complete description of the form to be given ; but the following 

 points are observable, and serve to mark the individuality of the species. 



The test is large, with an elongately oval or oviform marginal contour. The 

 greatest height is two thirds of the length, and is situated very far in front, which 

 gives the test a conspicuous excentric conical form. Seen in longitudinal profile the 

 anterior slope, which is very steep and precipitous, is comparatively flat and but little 

 convex ; it bends rather rapidly over on the rounded apex, and is gently curved at the 

 acutely rounded margin. The posterior slope, although steep, exhibits a much greater 

 incline than the anterior slope, and its flexure is remarkable; after proceeding a 



