202 THE FOSSIL ECHINOIDEA 



outline it resembles to a certain extent H. digonus, but is devoid of the deep anteal 

 sulcus of that species, and is much more tumid on the lateral portions of the dorsal 

 surface. Faint indications of a peripetalous fasciole may be seen ; and there are no 

 traces of any lateral fasciole present. The condition of the specimen is such that a 

 description is impossible ; and it is quite unfitted for illustration. 



Length of the test 21-5 millim., breadth 21 millim., height about 14-5 miUim. 



Locality. In the Khirthar series. Karra range, south of Trak. Survey-number 



G 302 

 125 • 



7. Hemiaster, sp. 



There is a greatly broken fragment from the white chalky limestone of the Baran 

 river of a fine and handsome species of Hemiaster. Unfortunately only a portion of 

 the test remains, and the greater part even of this is either broken or obscured by 

 matrix. We have succeeded in exposing a part of the anterior region, vphich shows the 

 outer part of the odd anterior and right anterior lateral petals. This and a portion of the 

 lateral region of the test are all that are available for observation, and the condition is 

 such that no intelligible drawing can be given. Judging from what can be seen of the 

 marginal contour, of the characters of the anterior interradia, and of the course of the 

 peripetalous fasciole, the fragment presents the closest afiinity to Hemiaster apicalis, 

 described on a preceding page. The anterior pair of petals, however, have the extre- 

 mity of the groove more fully rounded, the margins appear to be straighter and more 

 parallel, and their angle of divergence is smaller than in that species, the character of 

 the petals as a whole being much nearer to H. nohilis. Notwithstanding this we are 

 very strongly inclined to regard the form in question as a young or medium-sized 

 example of H. apicalis ; but as doubt obviously exists from the very unsatisfactory and 

 indeterminable nature of the fragment, and as any observation upon the character of 

 the apical region of the test and of the odd posterior interradium is impossible, we 

 refrain from ranking it definitely with that species, until a further supply of material is 

 available for study. 



The test, of which the present fossil is a fragment, was originally about 49 mUlim. 

 in length. 



Locality. In the Khirthar series of strata, Bolari Bridge, on the Baran rivers, 



Gr 280 



south-west of Kotri. Survey-number -gg-. 



Genus BEISSOPSIS, Agassiz, 1847. 



Test oval or oblong, subcordiform, having the anterior margin indented by the 

 anteal sulcus, more or less inflated at the margins and on the abactinal surface ; actinal 

 area frequently more or less convex. 



Apical disk compact, subcentral or excentric in front. 



Paired ambulacra petaloid, subequal, in shallow furrows, more or less curved. 

 The anterior pair widely divergent, the posterior pair more closely approximated. The 



