GASTROPODA. 67 



tively higher and less numerous whorls. The specimens from Baluchistan agree 

 so well with Stoliczka's fig. 2 that I have not the slightest douhtthat they represent 

 the same species. The only difference which I can discover is, that the ribs are a 

 little more rounded in the Baluchistdn specimens than in those of Southern India. 



VoL-DTiLiTHES DUBIA, spec. nov. PI. XVI, fig. 8-8a. 



A single cast of a shell, to judge from the ornamentation of the whorls, pro- 

 bably belongs to this genus. It consists of four whorls, but the apex is broken 

 off, as well as a good deal of the last whorl. The whorls composing the spire are 

 rather low, but quickly increase in size, the last whorl occupying fully half of the 

 total height of the shell. The whorls are rounded, the suture deep. The last whorl 

 is anteriorly accuminate. As far as can be ascertained, the ornamentation consisted 

 of rather strong longitudinal ribs, which extend from suture to suture la an oblique 

 direction, becoming thicker and more rounded in the middle than at the ends. 

 There are about ten of these ribs to each volution ; the broad interstices are flat, 

 even somewhat concave. Aperture unknown. 



Locality and stratigraphical potition. — Mazdr Drik, horizon 8. 



Memarks.-^Thia species bears the strongest resemblance to Volutilithes latisepta, 

 Stoliczka, but on close examination it will be found that the two forms are 

 different. As regards the general shape, it is at once apparent that the proportion' 

 of spire to last whorl is different in both species. In Volutilithes latisepta the 

 spire is comparatively low and the last whorl rather high, in Volutilithes dubia the 

 spire is much higher in comparison to the last whorl. There are also a large 

 number of longitudinal ribs, which are much finer in the species from Southern 

 India than in that from Baluchistan, and in the latter they are much less pronounced 

 on the last whorl than on the former. 



Genus: VOLUTOMORPHA, Gabb. 



VoLUTOMORPHA, spec. PI. XVII, fig. 2. 



The cast of an elongated fusiform shell probably belongs to this genus. It 

 shows four whorls still preserved, but must have consisted of more, as the apex 

 is broken off ; the spire was pretty high, being composed of moderately high, some- 

 what inflated whorls, which increase slowly in height. The last whorl, which is 

 strongly attenuated in front, measures about double the height of the spire, and 

 owing to its long slender shape forms a conspicuous feature of the species. There are 

 inclications of a rounded keel at about the middle of the height of the whorls, from 

 which the surface slopes towards the deep suture. On the last whorl this keel, 

 leaving the median line, runs high up towards the posterior side of the whorl. 

 Aperture very long, narrow. Outer lip apparently sharp. 



Locality and stratigraphical position. — Mazar Drik, horizon 8. 



