164 THE FOSSIL ECHINOIDEA 



Dimensions. 



a. h. c. d. 



millim. millim. miUim. miUim. 



Length of the test 78 55 50 31-5 



Breadth of the test 69 48 44 26 



Height of the test 37 30 27 20 



Breadth of postero-lateral petal . . 10-5 7 7 4 



Localities. In the Khirthar series : — 



i. Kohri, Upper Sind. Survey-number ^^. 



& 226 



ii. Eohri on the Indus, Upper Sind. Survey-number ^^g"* 



iii. West side of Bhago-Thoro hill, south of Sehwan. Survey-number -gg-. 



Illustrations of the Variety in Plate XXIX. 

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



12. Actinal vievp of the same : natural size. 



13. Longitudinal profile of the same : natural size. 



14. Longitudinal profile of another spiecimen, somewhat less tumid : natural 



size. 



15. Longitudinal profile of a large specimen : natural size. 



16. Abactinal view of the test of a small specimen: natural size. 



17. Longitudinal profile of the same : natural size. 



6. EcHiNOLAMPAS ANGUSTiPOLiA, Luncan & Sladen. Plate XXX, Figs. 1-11. 



Test of moderate size. Marginal contour elongately oval, presenting no promi- 

 nences to disturb the regularity of the outline, excepting the more or less prominent 

 posterior rostration. The breadth is equal to about four fifths of the length, or is in the 

 proportion of 0-79 : 1. The dorsal surface is high and tumid ; the height about equal 

 to half the length. The apical disk is excentric in front, the relation of the anterior 

 to the posterior portion of the median line being approximately in the proportion of 

 2 : 3, Seen in longitudinal profile, the posterior slope of the dorsal outline has a very 

 small angle of inclination, and then curves rapidly at the posterior extremity, which is 

 very high and thick. Unfortunately in the type specimen this extremity has been 

 destroyed, and also the anterior part of the dorsal surface. In two smaller examples 

 the anterior slope is much more inclined, and the anterior margin comparatively thin. 

 That this was also the character of the larger specimen there is little doubt, from the 

 indications that remain. In the smaller specimen, two thirds the size of the type, the 

 periproct is placed very high in the margin, wholly removed from the ventral surface, 

 and almost vertical in position j it is slightly arched over by the posterior rostration. 

 The transverse profile shows the dorsal area to be a regular convex curve of low 

 elevation, with the sides of the test very thick and tumid, and the outline curving 

 thence gently on to the tumid actinal surface. The tumidity of the actinal surface is 

 very characteristic ; the test around the peristome is moderately depressed, and there 



