22 FAUNA OF BALUCHISTAN. 



ambitus and lower surface form groups of three pairs, which are inclined in the 

 apical direction. 



The peristome is small, slightly excentral, and apparently irregularly pen- 

 tagonal. 



The periproct is large, pyriform, the point being turned in an apical direction, 

 situated just above the margin in such a way that it can still be seen from below. 



The ornamentation consists of small tubercles sunk in deep serobicules, which 

 are slightly larger, and more crowded on the lower, than on the upper surface ; 

 they are sometimes surrounded by minute granules. On the interporiferous zone 

 the tubercles are arranged in 9 vertical rows, which, except the median one, reach 

 from the mouth to the apical disc, and increase in size towards the centre line, the 

 tubercles of each row alternating with the others ; the tubercles are therefore also 

 arranged in apically inclined lines ; on the interambulacral areas the tubercles are 

 very irregularly distributed, although there is a tendency to an arrangement in 

 vertical rows. 



Locality and stratigraphical position.'— 'D6s valley, horizon 4. 



Bemarks. — By its larger size and the position of the periproct this species can 

 be easily distinguished from Pyrina ataxensis^ Cotteau. 



Subfamily : ECHINOLAMPIN^. 



Genus : EOHINANTHUS Breyn. 



EcHiNANTHUS GRiESBACHi, spec. nov. PI. IV. fig. 7-7 A, S-8b. 

 PI. V. fig. I-IA, 2-2b. 



Dimensions of four specimens. 



Length L = 39 38 37 26 



Breadth b = 32 32 28 22 



Height h = 20 20 21 16 



b 



•j^ = -82 -84 -76 -84 



h 

 -jl^ = -51 "52 -56 -61 



The moderately thick test is oval, but very slightly narrower in front than 

 behind ; the upper surf ace is tumid, varying considerably in the degree of eleva- 

 tion; in some specimens it is subdepressed, in others subglobular, as will be seen from 

 the above figures for -r ; the apex generally coincides with the apical disc, but 

 there are specimens where it is slightly behind it ; the profile forms a regular 

 semiellipse, but is very slightly truncated at the posterior end; the sides are 

 rounded and more or less inflated ; the lower surface nearly flat or very slightly 

 convex. 



The small apical disc is excentral and composed of four large genital plates 

 perforated by large holes and five minute ocular plates. 



