12 . FAUNA OF BALUCHISTAN. 



of very closely set, transverse, small tul)ercles, each of wliicli carry two or three 

 rounded minute granules, of which the inner ones are smaller than the outer ; the 

 poriferous zones are composed of small rounded holes, which are surrounded by a 

 low filiform ridge. This is, however, always much more distinctly developed in the 

 outer row than in the inner one ; the pores are arranged in horizontal pairs, which 

 are separated by a low but sharp septum. 



The interambulacral areas are wide and consist of rather narrow but high plates 

 of which there are six in each row, decreasing in size towards the periproct and the 

 apex, those at the equator being the largest. The tubercles are large and promi- 

 nent, the mamillary eminence is apparently rounded and perforated, the boss is 

 depressed and destitute of crenulations, the areola is large and encircled by a complete 

 row of small granules. 



The miliary zone is rather large, slightly depressed, and provided with numerous 

 uniform small granules which are arranged in little, irregular, horizontal lines. 



Peristome and opening for the apical disc not seen. 



Locality and stratigraphical position. — Des Valley, horizon 2 : rare. 



Remarks. — The peculiar ornamentation of the ambulacral area, consisting of 

 two narrow rows of transversely elongated tubercles, which originate by the 

 passing into each other of two or three separate rows, still indicated by the secondary 

 granules, distinguishes this species from all the other known forms. 



It shows, however, a close relationship to Cideris mamillata, Cotteau,^ particularly 

 as regards the narrow interporiferous zone of the ambulacral areas, and the rather 

 small number of tubercles on the interambulacral areas. Unfortunately no enlarged 

 figure of a part of the ambulacral area is given, and I am therefore unable to say 

 whether the ornamentation is the same as in Cidaris suleimani or not. If it were 

 the same the two species ought to be considered as identical. 



Family : GLYPE08T0MATA. 

 Subfamily : DIADEMATIDiE. 



Genus : ORTHOPSIS, Ootteau. 

 Oethopsis perlata, spec. nov. PI. II, fig. 2-2c. 



Test circular, about 38 mm. in diameter, height about 12 mm., upper surface 

 a little inflated, depressed ; lower surface nearly flat, slightly pulvinated at the 

 margin ; apical disc pentagonal, rather small, composed of five large heptagonal gen- 

 ital plates perforated by large holes and five small pentagonal ocular plates perforated 

 by minute holes ; the madreporiform plate is a little larger than the other genital 

 plates which bear a few small granules. Anal opening small, subhexagonal. 



Ambulacral areas rather broad, but less than half the breadth of the interambu- 

 lacral areas; poriferous zones straight, composed of small rounded pores; pores ar- 



' Pal^ontologie fran9aise ; Terr. cretac4, Eohinides, p. 830 pi, , 1079, figs. 11—14. 



