OF WESTERN SIND. 215 



The peripetalous fascicle is obliterated, as well as the whole of the ornamentation 

 of the abactinal surface. 



Bemarks. This form is readily distinguished from the species previously described 

 by the shape of the test, both in marginal outline and in the character of the abactinal 

 surface, by the structure of the anterior pair of petals, by the thin angular margin, and 

 by the depression around the peristome. There appears to be some variation in the 

 position of the apical summit of the test, which in one specimen at least corresponds 

 with the position of the apical disk ; and there is also in the same example a slight 

 curvature near the apex in the anterior zone of the posterior petals, which causes them 

 to have a rather thicker appearance than in the test we have described above. 



Dimensions. The largest specimen measures 30'5 millim. in length, 30 millim. in 

 breadth, and 15 millim. in height. 



Localities. In the Khirthar series of strata : — i. Three or four miles south-south- 

 east of Meting (at base of the scarp). Survey-number ^jj^- 



ii. Aongar-hill scarp, east of Meting Railway-station (base of scarp). Survey- 

 number ^. 



Illustrations of the Species in Plate XXXVI. 



Fig. 11. Abactinal view of the test: natural size. 



12. Actinal view of the test : natural size. 



13. Longitudinal profile of the test: natural size. 



14. A portion of the abactinal surface, to show the apical disk and the 



ambulacral petals : magnified. 



6. Metalia, sp. Plate XXXVI, Figs. 15 & 16. 



There is a single test of a Metalia in the collection, which unquestionably belongs 

 to an undescribed species ; but its state of preservation is so bad that a proper diagnosis 

 is impossible, and we have consequently refrained from giving it a name until better 

 material is available. Two drawings of the specimen have been given to facilitate 

 future identification, and the following details are all that can be observed. 



The marginal contour is rotund, rather angularly expanded laterally, the greatest 

 breadth nearly equal to the length. The anterior margin is sharply indented by a well- 

 defined anteal sulcus, and the posterior extremity is slightly truncate. The greatest 

 height of the test is thrown far forward close to the anterior margin, so that in the 

 longitudinal profile the anterior extremity is seen to be a very steep and almost preci- 

 pitous incline, passing with a rapid and sharply rounded curve from the dorsal surface. 

 The posterior slope is long and even, forming a gradual incline to the posterior 

 extremity. The abactinal surface is much depressed, the greatest height being two 

 fifths of the length, and the margins are thin and sharply rounded. 



The apical disk is excentric in front, but much less so than the apical summit. 

 All the structure is destroyed. 



The odd anterior ambulacrum is situated in a deep and sharply defined groove, 



2f2 



