30 THE FOSSIL ECHINOIDEA 



extremities the other generative plates which enter into the composition of the anal 

 orifice. 



The suranal plate is thus in contact with all the generative plates. One ocular 

 plate, the right posterior lateral, enters into the composition of the anal ring, and 

 so do the two generative plates, that is to say the first and fifth. 



The ambulacra are narrow, slightly wavy in their course; the poriferous zones 

 reach from the level of the test obliquely to the interporiferous zones, which are 

 decidedly above the level of the interradia. The poriferous zones are narrow, and 

 their plates are numerous and about 40 in vertical series. The pores are round and 

 well open ; and one is a perforation in an ambulacral plate, and the other of the pair, 

 placed more or less obliquely and nearer the interporiferous zone, is formed by an 

 excavation on the edges of two consecutive plates. Each of these last kind of pores is 

 in the line of suture of the consecutive ambulacral plates, and each is separated from the 

 other above it by a ridge continued from the base of the tubercle on the edge of the 

 interporiferous area. The interporiferous zone has on either side a vertical series of 

 small secondary tubercles with minute mamelons and non-crenulate bosses ; and each 

 tubercle corresponds to a broad part of an ambulacral plate. In the median space 

 there are two parallel, vertical rows of large miliaries, of about the same number as 

 the secondaries, and also a few microscopic granules. 



The interambulacra are wide, and occupy much space at the peristome and around 

 the apical disk. 



There are four very large, projecting primaries ; and in some areas there is a fifth, 

 but slightly smaller, primary tubercle. The larger tubercles have a large boss with a 

 circular shoulder to it, and a broad top which is crenulate. The mamelon is small, 

 and has a decided neck and a rather flatly rounded top. 



The scrobicular circle is distinct and is composed of a few small tubercles, with 

 still smaller ones intercalated here and there. The circle is complete between the 

 tubercles, but not between the tubercles and the poriferous zone. An irregular row of 

 miliaries is beyond the circle on each plate. The space occupied by the small plate in 

 each area, near the apex, is covered with a crowd of large miliaries ; and these pass into 

 the median line, but they soon become sparsely distributed there in two rows with an 

 occasional intercalation. Near the peristome, where the small primaries are found, the 

 miliaries increase in number. 



The peristome is rather larger than the apical system, is somewhat deeply placed, 

 is obscurely pentagonal or nearly circular in outline, and the cuts for the branchiae are 

 very small. The plates are numbered in this description according to Loven. 



Height of largest test -^^ inch ; breadth -^ inch. 



Locality. Eanikot series, north by east of Petiani, west of Kotri. Survey-num- 

 uei 'J 135. 



There is a small much worn specimen of a young Salenia in the collection from the 

 same locality whence the other forms came. It has large primaries ; and the ambulacral 

 plates are singularly distinct and free from ornament. 



