OF WESTEKN SIND. 233 



anterior ambulacrum is scarcely discernible, and no groove is developed until close to 

 the margin, where there is a wide but very shallow indentation of the test, which 

 extends to the middle of the anterior column of the anterior interradia, along which 

 there is, moreover, a faint, but distinctly perceptible, trace of carination. The pores 

 are very minute and wide apart. The postero-lateral petals are unfortunately obscured. 



The large tubercles of the abactinal surface are numerous, uniform, and prominent, 

 and are arranged in lines parallel with the outline of the plates, and consequently 

 obtusely angulated, as in the preceding species, the number, however, being less. 

 There were also probably a few small tubercles amongst the miliary granulation of the 

 plates, and it may be noticed that the tubercles generally diminish in size as they approach 

 the margin. On the actinal surface the tubercles are large and distinct, and there is a 

 tendency to assume a lineal arrangement in the lateral regions. 



The latero-peripetalous fascicle is of wide extent, placed at the very margin of the 

 test, just above the ambitus, in the anterior and lateral portions of the test; on the 

 posterior half of the lateral interradia it leaves this extreme marginal position and 

 encroaches on the abactinal surface slightly. Consequent on its marginal position the 

 distance of the fascicle from the extremity of the antero-lateral petals is compara- 

 tively great. The fasciolar band is very narrow, and there do not appear to be any 

 large tubercles outside its limits — a circumstance almost obviously dependent on its 

 marginal position both in this and the preceding species. We can detect no trace of 

 any subanal fasciole, and from the nature of the tuberculation that remains on the 

 fragmentary portions of that region preserved in our specimen, we are led to infer that 

 no fasciole was originally present. 



Bemarks. Notwithstanding the very bad state of preservation of the fossil under 

 notice, and the consequent imperfection of the above description, the form is readily 

 distinguishable from its associates, and, as far as we are aware, from the other species 

 of the group. Owing to the uncertainty respecting the presence of a subanal fasciole, 

 we felt some hesitation as to whether this form was really a Macropneustes or should 

 instead be placed as a Euspatangus. The inferred absence of that structure, and the 

 character of the abactinal tuberculation, determined our opinion in regarding it as 

 belonging to the former genus, the primary tubercles being more numerous, more pro- 

 minent, and in less definite scrobicules than are normally found in JEuspatangus. 



Dimensions. Length of the test 33 millim. ; breadth 30 millim. ; height, measured 

 at the apical disk, 13-5 millim. (the greatest height is probably situated in the posterior 

 interradium ; but as that portion of the test is covered with matrix, no measurements 

 are possible). 



Locality. In the Khirthar series of strata. Teyon (or Tiyun), east of Chorla 



Survey-number ^^• 



Illustrations of the Species in Plate XXXVIII, 

 Fig. 6. Abactinal view of the test : natural size. 

 7. Actinal view of the test : natural size. 



