1895.] 



ME. F. A. BATHER OS TTINTACRINUS, 



985 



accuracy of the figures. Were it not for the fact that Mr. Hill's 

 diagram has already woefully failed us, one would not doubt it any 

 more than Clark's ; but till Mr. Hill has explained how the various 

 plates of his analysis can be fitted together, his drawing must 

 inevitably be neglected. 



Despite the considerable variation among the interbrachials, 

 there is no evidence to show that in a single individual any one of 

 the interradii was so different from the others as to suggest its 

 being an anal interradius. 



The interdistichals have been described by all previous writers 

 as two in number. Certainly this number preponderates ; but 20 

 specimens in the British Museum, of which 28 interdistichal areas 

 can be examined, show 2 interdistichals in 10 areas, e. g. b, f 

 (figs. 6, 8), 3 in G areas, e. g. jj (fig. 7), 4 in 6 areas, e. g. y, / (fig. 4), 

 4 or 5 in 1 area, 5 in 4 areas, e. g. d, k, g (figs. 10, 11), and 8 in 



Fig. 10. 



Uinfacrinus socialis, part of Brit. Mus. E 6p27, d, si 

 pinuuIeB, interbrachials, interdistichals, and inter 



ihowing fixed disticbals and 

 terpinnulars. Natural size. 



Fig. 11. 



Fig. 12. 



Uintacrinns socialis, interdistichal areas of Brit. Mus. E Cp27, ^ (fig. 11), 

 and E 6528, « (fig. 12). Natural size. , 



1 area, viz. in a (fig. 12). The interdistichals are surrounded by 

 IlBri,2, 3, 4 and by one or two ossicles of the proximal radiad 

 pinnules. The proximal interdistichal is usaaUy heptagonal, and 

 abuts on IIBri, 2, &3 and on the succeeding interdistichal. It 

 may, however, not reach so high as IlBr^, and it may not sink 



3/ 



