256 THE FOSSIL ECHINOIDEA 



plate the vertical row of secondaries has a second one between it and the pores. The 

 obliquity of the direction of the three secondaries explains the singularly oblique shape 

 of the coronal plates (Fig. 12, in which the outlines of the plates are shown without these 

 secondary tubercles). At the ambitus these vertical secondaries are in three rows. 

 Each row is oblique ; the largest secondary, very much smaller, however, than the 

 primary, is close to it, and the other two form a close line near the actinal and outer 

 edge of the plate. The^e may be only two secondaries, but in large forms there are 

 three at the side of the largest primaries. More actinally there are only two, and 

 near the radial plate only one. Above the oblique, line of secondaries is a crowd of 

 miliaries at the ambitus, and this diminishes actinally. In the median line, from the 

 ambitus adorally, there are two rows of miliaries with an occasional third, and the 

 miliaries pass along the horizontal sutures as well here and there. Above the ambitus 

 the ornamentation is of large open zigzag grooves. 



There is no doubt that Ccelopleurus Pratti is distinct from Ccelopleurus equis ; and 

 that the numerous secondary tubercles on the outer part of the interradial plates, with 

 the miliaries above and below them and in the median line also below the ambitus, 

 distinguish this species from C. equis. The narrow ambulacra are very distinguishing. 



But when Ccelopleurus Forbesi, d'Arch., of the' Miocene, is compared with C. Pratti 

 all sorts of difficulties arise, and principally because, like many of MM. d'Archiac and 

 Haime's species, it is founded on a solitary specimen which we should pass by as 

 unvporthy of notice. This species will be considered in dealing with the Gaj Echini 

 in the next Fasciculus, and it is only necessary to remark that a worn and very probably 

 derived specimen is in the Nari collection. 



Dimensions. Height 15, breadth 27 millim. ; height 17, breadth 31 millim. 



Others measure : height 17 millim., breadth 34 millim. ; height 13 millim., breadth 

 26"5 millim. These are more depressed than the type of d'Archiac and Haime. 



Localities. Nari or Oligocene series of Sind. West side of Bhagothoro Hill, 

 south of Sehwan. Hindi Hill. Survey-numbers G -,-6-, G 



302 

 67 • 



Illustrations of the Species in Plate XXXIX. 

 Fig. 9. The abactinal view of the test. 



10. The ambulacral and interradial areas at the ambitus : magnified. 



11. Apical system : magnified. 



12. Semi-diagram of the oblique interradial plates and of the direction of 



the ambulacral sutural lines : magnified. 



