62 PATJNA or BALUOHISTlN. 



growth in such a manner as to produce an exceedingly delicate net-like ornament- 

 ation. It appears that the posterior end of the outer lip ascended for a short dis- 

 tance along the spire. 



Locality and stratigrapMcal position. — Mazdr Drik, horizon 8. 



Bemarks.— All the specimens which have come under examination are, with 

 one exception, casts in rather a mutilated condition. For this reason the generic 

 determination seemed somewhat difficult at the beginning. Owing to the strong 

 keels on the last whorl, which seemed to indicate a digitated outer lip, I first felt 

 inclined to consider this species as belonging to the genus Pterocera, Lam. This 

 view seemed to be supported by a posterior canal, apparently ascending along the 

 spire. The probable continuation of the last whorl, however, seemed incompatible 

 with this view. All the specimens show distinctly that • the last whorl did not 

 expand in a horizontally spread wing, but that it continued to run in a spiral line. 

 This was certainly an indication that the aperture of this specimen must have been 

 shaped differently from that of Pterocera, Lam., wliether it terminated in digita- 

 tions or not. 



On comparing these specimens with such as undoubtedly belonged to the 

 genus Pugnellus, I recognized such a strong general resemblance that I have no 

 longer any doubt, that notwithstanding the peculiar ornamentation of the last whorl, 

 these specimens must be considered as belonging to the genus Pugnellus. It is to 

 be hoped that future researches will yield some better preserved specimens, to 

 decide this question. 



For the present I consider, this form as belonging to the genus Pugnellus ; it is 

 easily distinguished from all the other species of this genus by the horizontal keels 

 on the last whorl. 



PuGNEiLTis GIGANTEUS, spec. nov. PI. XVII. fig. 1-la. 



This fine species attained a height of at least 83 mm., but unfortunately 

 there are only two specimens which have come under examination, and these are 

 casts, with only traces of the substance of the shell still adhering. The shell has 

 an ovoid shape and consists of more than five whorls ; the whorls which compose 

 the spire are flat and rather low, and increase slowly in height ; the last whorl is 

 rather inflated and increases so suddenly in height that it occupies at least two- 

 thirds of the total height. The posterior part of the last whorl slopes slightly to- 

 wards the suture ; the anterior end is somewhat accuminate. The aperture is semi- 

 lunar and fairly broad towards the anterior canal. The ornamentation consists 

 of four to five strong revolving ribs on the last whorl, but it is impossible to say 

 for the moment whether there also existed some finer ornamentation or not. 



Locality and stratigrapMcal position. — Sondri bill, near Khattan. 



Bemarks. — At the first glance this species seems very much the same as Pug- 

 nellus digit atus, but on comparing the two some characteristic differences will be 

 ■noticed. The latter form never attains the size of the former, but keeps within 



