54 FAUNA OE BALUCHISTAN. 



whorls, which increase very slowly in height, and are separated by a deep suture. 

 The surface is covered with numerous fine revolving ribs which have a scaly 

 appearance from being crossed by numerous striae of growth. If I am right, the 

 more central of these ribs are generally the strongest. 



Locality and strati graphical position. — Maz^r Drik, horizon 8 ; Des valley. 



Eemarks. — The general shape and the ornamentation of the Baluchistaa 

 s pecimens are so nearly the same as those of the form described by Leymerie, that I 

 think I am not wrong in identifying them. 



Another closely related form seems to be Troehus rimosus, Bink., from the 

 Maestrichtien, but the Baluchistan specimens show unquestionably more affinity 

 with the former, than with the latter species. 



2. Family : NERITID^ 

 Genus: NEEITA, Linne. 

 Nekita pontica, d'Archiac spec. PI. XIV. fig. 3-3A, 4-4b. 



1859. Nerita pontieum, d'Archiac Note sur 1© genre Otostoma, Ball, de la Soo. Geol. de Prance, 

 2nd Ser„ Vol. XVI., p. 874, pi. XIX, figs. 2 and 3. 



The shell is subglobose, and consists of about three rapidly increasing volutions ; 

 the spire is depressed, the suture simple. The last whorl, which is highly inflated, 

 is a little flattened on its posterior side. The ornamentation of the surface consists 

 of rather strong equidistant longitudinal ribs, which are strongest near the suture, 

 but die out before they have reached half the height of the last whorl ; in its lower 

 half only indistinct traces of them can be noticed j ribs and interstices are covered 

 with fine, closely set, rather irregular striae of growth, which produce a rugose 

 appearance of the surface. On the anterior half of the last whorl a number 

 of shallow, equidistant spiral furrows can be seen, but which are very variable as 

 regards distinctness. 



Aperture scarcely seen ; outer lip sharp ; inner lip not seen. 



Locality and stratigraphical position. — Mazdr Drik, Hemipneustes beds. 



Bemarks. — 'Ihe ornamentation of the shell varies considerably ; in one speci- 

 men the longitudinal ribs are closely set, so much so that the interstices are less 

 broad than the ribs ; on the other specimens the ribs are rather far apart and the 

 interstices are therefore broad. Whether the number of the spiral furrows changes 

 I am unable to say ; one specimen exhibits ten of them ; in the other they are much 

 less distinct, and probably less numerous. The fine strise of growth which cover 

 the longitudinal ribs, make it appear as if the former were dissolving into numerous 

 fine strise at the point from which they become indistinct. 



I have not the slightest doubt that the specimens from Baluchistdn must be 

 identified with this species, as the ornamentation of the shell is apparently exactly 



