OF WESTERN SIND. 47 



from a very faintly marked scrobicule environed more or less distinctly by a few wide- 

 apart miliaries. The boss is tumid, and the crenulation passes down the flanks ; the 

 mamelon is small. The number of the large tubercles in vertical series, in relation to 

 that of the ambulacral series, is one half; and the interradial ones are at least one third 

 larger than the others. As the vertical series passes downwards it is placed nearer the 

 centre of the plate in order to permit the second series to come in. In the higher 

 plates, from the fifth towards the poriferous zone, there are a few small, crenulate, 

 imperforate tubercles ; they are represented by large miliaries nearer the apex, and by 

 larger tubercles lower down. Towards the median line of the interradial area no 

 large tubercles exist, but there are several crenulate and imperforate ones about the 

 size of the boss of the larger tubercles, and they are scattered without order. 



Here and there are some small miliaries. Hence there is much median space, 

 without any large tuberculation, on the upper part of the test. 



The breadth of the largest interradial plate is ^ inch, and the breadth of the 

 ambulacrum at the same level is |- inch. 



Locality. North by east of Petiani, west of Kotri. Ranikot series. Survey- 

 number G m. 



Illustrations of the Species in Plate VIII. 

 Fig. 4. The specimen of Eurypneustes grandis, Duncan and Sladen : natural size. 

 6. The tenth interradial plates and corresponding ambulacral plates: mag- 

 nified 3 times. 



A large portion of the test of one of the regular Echini is in the collection from 

 the Ranikot series. The actinal surface of the test is partly preserved, but only a 

 small portion of the peristome is visible ; the ambitus is defective, and there are parts 

 of the ambulacra and interradial series above it in a bad state of preservation. The 

 apical system is absent. The general shape has been preserved. 



The details of the test indicate that it belongs to a genus not hitherto noticed, and 

 they are described with the hope that, on some future occasion, more perfect specimens 

 may be found. 



Genus ^EOLOPNEUSTES, gen. nov. 



Test of large size, subcircular or subpentagonal in marginal contour, subdepressed 

 and subconical abactinally. Sides tumid. 



Ambulacra broad, narrower than the interradial areas. Poriferous zone wide, 

 equal to or greater than half the breadth of the interporiferous area ; both zones 

 broadest just above the ambitus, and decrease gradually towards the peristome. The pores 

 on the abactinal portion of the zone are arranged in almost horizontal arcs of five or six 

 pairs, very regular and very closely placed ; below the ambitus on the actinal surface the 

 number of pairs of pores in each arc diminishes, the arc straightens, and the angle of 

 obliquity decreases, by gradual stages, until close to the peristome the pairs of pores 

 stand in almost straight and simple vertical series. 



h2 



