198 THE FOSSIL ECHINOIDEA 



the corresponding part of the fasciolar band from the other side. In front the fascicle 

 is well rounded at the extremity of the antero-lateral petals, and is directed inwards, 

 crossing the keel of the anterior interradia with a slightly incurved course, and when 

 near to the wide groove of the odd anterior ambulacrum it curves rather sharply forwards, 

 and is then bent rather abruptly at right angles to descend the groove, which it crosses 

 at the upper portion, or commencement, of the marginal tumidity ; the fasciole conse- 

 quently appears well remote from the ambitus, and is especially so in the median region 

 of the anterior interradia. 



The ornamentation on the abactinal surface of the test is generally small, but 

 becomes larger in the lateral regions and in front, whilst at the ambitus in front and on 

 the actinal surface there it is remarkably large and well defined. The primary tubercles 

 at this place have a small perforate mamelon on a comparatively large, tumid, and 

 button-shaped crenulate boss, standing on a circular disk-like scrobicule. The scrobi- 

 cules are separated by a single ring of minute miliary granules, which is often incom- 

 plete. In the plates having tumid prominences the ornamentation is usually smaller 

 and more crowded in the centre of the raised portion, the size increasing gradually out- 

 ward therefrom. 



Bemarks. This large and handsome form is a worthy congener of the species above 

 described. It is readily distinguished from H. ajpicalis by the different form of the test, 

 by the comparatively low and sloping posterior region, by the size, shape, and divergence 

 of the ambulacral petals, by the different course of the fasciole, which is also more 

 remote from the margin, and by the larger and more widely-spaced tuberculation on the 

 anterior part of the test. 



Dimensions. Length of the test 62 millim., breadth 68 millim., height 37 millim., 

 approximately (probably somewhat higher). 



Locality. In the Khirthar series of strata. Hilly ground, south-east of Trak Hill. 

 Survey-number ^~. 



Illustrations of the Species in Plate XXXIV. 



Fig. 8. Abactinal view of the test: natural size. 



9. Longitudinal profile of the test : natural size. 



10. Portion of the odd anterior ambulacrum : magnified. 



11. Portion of one of the antero-lateral petals : magnified. 



3. Hbmiastee CAEmATus, Duncan & Sladen. Plate XXXIV, Figs. 12-14. 



There is a fragment of a Hemiaster in the collection which is sufficiently preserved 

 to show characters of a very remarkable nature, and on this account we have ventured 

 to name it, although the condition of the fossil unfortunately does not admit of a 

 complete diagnosis of the species being given. 



The test was of medium size, probably subrotund and very broad. Apical disk 

 subcentral, with the test apparently sloping nearly uniformly therefrom on all sides. 

 The odd anterior ambulacrum is situated in a wide deep groove. The antero-lateral 



