82 THE FOSSIL ECHINOIDEA 



preserved as to be perfectly undeterminable. Erom such characters as can be made' 

 out, the form was possibly identical with, or at any rate nearly allied to, H. digonus, 

 d'Archiac. 



As this form is very abundant in a higher horizon, it is unnecessary to refer to the 

 species at greater length in the present place ; and the specimen is so unsatisfactory 

 that we should not have mentioned it, excepting for the interest which attaches to it 

 as a probable record of the presence of that species in the Eanikot series. 



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

 number G xf 5- 



Genus LINTHIA, Merian, 1853. 



(See cmtea, p. 17, part i.) 



1. LiNTHiA Indica, sp. nov., and a variety. Plate XX, Figs. 1-8. 



The test is broadly oval, depressed, with an angular outline, notched in front, 

 narrowed and truncated behind. It is widest just behind the centre, and the marginal 

 outline is wider and more rounded in front than behind. The apical surface slopes in 

 front from a low, rounded, sharp, narrow keel, which separates the posterior ambulacra 

 and overhangs the periproct, the highest point being behind the posterior ambulacra. 

 The actinal surface is slightly rounded and convex ; and there is a downward-projecting 

 posterior point to the plastron. A front view of the test shows the tumid and some- 

 what nodulose margins or flanks, the anterior groove for the odd ambulacrum keeled 

 on either side near the apical system, and behind it the sharp narrow triangular outline 

 of the keel of the posterior interradium. 



The apical system is slightly in front of the centre, is small, and is placed on a 

 depressed area formed by the junction of the raised posterior keel, the narrow keels of 

 the lateral interradial areas, and the keels of the anterior odd ambulacrum. 



There are four generative pores, and the anterior and posterior pairs are 

 rather close together ; the anterior pair of pores are much closer than the posterior 

 pair, which are wide apart. The right anterior plate is in relation with the madre- 

 poric body, which separates the posterior pair of plates widely, and which passes 

 slightly backwards and separates the posterior ocular plates. The anterior generative 

 pores are on a line with the ocular pores of the odd and antero-lateral ambulacra, and 

 the posterior ocular pores are on a line with the anterior and posterior generative pores. 



The peristome is rather close to the anterior margin, and the periproct is high up 

 in the posterior truncation. 



The groove for the anterior odd ambulacrum is rather deep, and becomes shallower 

 and broader towards the margin, which it notches decidedly ; it is continued more or 

 less on to the peristome. 



A few sets of pairs of pores are on the flanks of the groove, and the twelfth pair 

 are crossed by the fasciole. Each pair is in a shallow hollow, and the pores are oblique 

 and separated by a granulation. 



