174 THE FOSSIL ECHINOIDEA 



the zone, where also the pores of a pair exhibit a faint tendency to stand at an angle in 

 relation to one another. The petals are flush with the surface of the test ; and the inter- 

 poriferous area is about two and a half times the width of the poriferous zone at its 

 widest part, but very little more than one and a half at the extremity of the petal, 

 measured at the termination of the short anterior zone. The ornamentation of the 

 interporiferous area is similar to that of the rest of the abactinal surface of the test, 

 and consists of small primary tubercles sunken in small, equidistantly-spa'ced scrobi- 

 cules, with the intervening spaces rather broad, but less than the diameter of the 

 scrobicules, the structure being remarkably confluent, almost to the complete obli- 

 teration of the component granules ; and the margins of the scrobicules have a 

 slightly bevelled appearance. In the region of the ambitus the scrobicules are inore 

 closely placed. 



Nearly the whole of the actinal surface is either obscured or destroyed. There is 

 a considerable and widely extended depression towards the peristome, the position of 

 which is more or less excentric in front. The periproct is small, transversely oval, and 

 encroaching on the margin. 



Remarks. This species is closely allied to E. Jacquemonti, d'Archiac and Haime ; 

 but diffiers in the form of the test, and in the smaller and comparatively more excen- 

 trically-placed ambulacral rosette ; whilst the general height and tumidity of the sides 

 also appear wanting in our form, and the concavity of its actinal surface is very much 

 greater than in E. Jacquemonti. 



Dimensions. Length of the test 40 millim., breadth 35 millim., height 17'5 millim. 

 (somewhat crushed). 



Locality. Khirthar series of strata : — Trak Hill, seventeen miles south of Bula 

 Khan's Thana. Survey-number ^. 



Illustrations of the Species in Plate XXXII. 



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. 



11. EcHmoLAMPAS, sp. (Junior). Plate XXXI, Figs. 1-5. 



Amongst the rich collection of Echinolampads from the Khirthar series, there are 

 two unquestionably in a premature stage of development, but which, from their striking 

 character, we are unable to refer to any of the species previously described. The test 

 is of small size, elongate, and subcylindrical, with an elongately oval marginal contour, 

 full and well-rounded in front, slightly widest across the posterior third, thence rather 

 rapidly contracted and pointed posteriorly. The breadth is proportional to the length 

 as 0-75 : 1. The dorsal surface is convex along the longitudinal axis of the test, and 

 the margins are full and tumid. The height is rather more than half the length, being 

 in the proportion of 0-59 : 1. Seen in longitudinal profile the flatness of the dorsal 



