CRETACEOUS FOSSILS. 163 



In the latter, pi. 20, fig. 124, there is shown an angular notch on the outer lip, also 

 mentioned in the description as one of the specific characters. The shell is a com- 

 mon one, and the discovery of numerous specimens shows that this notch is by no 

 means constant. A very old, but small individual before me, is so heavily incrusted 

 that its original form is entirely lost, and several expert conchologists have been, 

 on first sight, at a loss to recognize at all, even its family relations. It shows 

 no trace of a spire or of volutions, and the outer lip is almost as large as the body 

 whorl, while the canal is very short, and incurves at almost a right angle to the 

 axis of the shell. Were I less familiar with the species, I should hesitate in calling 

 this specimen by the same specific name, hut I have seen so many variations in its 

 form, that I have no doubts whatever on the subject. 



S. Gen. Gymnarus, Gabb. 

 P. (G-.) manubkiatus, Gabb. 



(Pugnellus manubriatus, Gabb; Pal. Cal., Vol. 1, p. 125, pi. 29, fig. 229, a.) 

 (Pugnellus {Gymnarus) manubriatus, Gabb; Amer. Jour. Conch., 1868, p. 139, pi. 

 13, fig. 4, 5.) 



In Palaeontologia Indica, Gasteropoda, p. 21, Stoliczka suggests that this species 

 may be identical with P. contortus, Sby. sp., which it closely resembles in sculp- 

 ture. It differs in being a much more slender shell, the callosity never heavy, the 

 outer lip more regular in form, and the anterior canal straight, instead of being 

 incurved as in contortus. In the Journal of Conchology, I recently suggested a 

 subgeneric separation, mainly on the peculiar form of the canal. 1 have examined 

 a large series of specimens, and cannot agree with Dr. Stoliczka, that the thinness 

 of the callosity is due to injury, since the same characters obtain in all the indi- 

 viduals. Nor is the canal broken in the specimen figured. I have never detected 

 the slightest indication of a curve in this portion of the shell, where the specimens 

 were perfect, or nearly so. 



CYPR^A, Linn. 

 S. Gen. Luponia, Gray. 

 C. (L.) Bayerquei, Gabb. 



PL 27, Fig. 43, a, b, c. 

 (? Cypraea Bayerquei, Gabb; Pal. Cal., Vol. 1, p. 129.) 



Shell small, ovoid, convex, broadest near tbe upper end, 

 gradually tapering convexly anteriorly; spire entirely bidden even 



