OF WESTERN SIND. 167 



is further strengthened by the fact that in much larger examples of E. Sindensis, and 

 of its variety, the .peristome is still elliptical, without any trace of pentangularity, the 

 ambulacra are straight and not lanceolate, the interporiferous areas are flush with the 

 surface of the test and not tumid, and the periproct is distinctly infra-marginal. 

 These characters, in association with the embryonic form of the peristome, would seem 

 to almost preclude the possibility of the small tests under notice being placed as the 

 young of E. Sindensis. 



Dimensions. 



Breadth Height 



Length , > --^ , ^ ^-^ 



in millim. • -n- Proportion ■ .„• Proportion 



inmmim. tolength=l. ^^^^^a. tolength=l. 



(a) 60 47-5 0-79 30 0-50 



(b) 47 35 0-74 21 (crushed) 



(c) 39 30-5 0-78 19 0-487 



(d) 24 20 083 13 0-54 



millim. 

 Greatest width of the postero-lateral petal in (a) the type specimen . . 6 



Width of the interporiferous area at this place 4 



Greatest width of the poriferous zone 1 



Localities. In the Khirthar series : — i. Baili, west of Tong. Survey-number ^^• 

 ii. South-west of Jhirak. Survey-number ^||®. (A very badly preserved specimen, 

 almost indeterminable.) 



Illustrations of the Species in Plate XXX. 



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



2. Actinal view of the test : natural size. 



3. Longitudinal profile of the test : natural size. 



4. Actinal view of another specimen : natural size. 



5. Transverse profile of the same specimen seen from behind : natural size. 



6. Abactinal view of the test of a young specimen : natural size. 



7. Actinal view of the same : natural size. 



8. Longitudinal profile of the same : natural size. 



9. Transverse profile of the same seen from behind : natural size, 



10. Peristome of the same specimen : magnified. 



11. Primary tubercles on the actinal surface of the same specimen : magnified. 



7. EcHiNOLAMPAS NUMMULiTiCA, Duncan & Sladen. Plate XXX, Figs. 12-15. 



Test of large size ; marginal contour suboval, slightly prominent in the posterior 

 portion of the lateral interradia where the greatest breadth occurs, and with a well- 

 developed posterior rostration. The greatest breadth is proportional to the length as 

 0'77 : 1. The dorsal surface is regularly convex, and the height is about two fifths of 

 the length, or as 0*4 : 1. 



The apical disk corresponds with the summit of the test, and is excentric in front, 

 the relative proportions of the anterior and posterior portions of the median longitu- 



z2 



