The Invertebrate Fauna of the Uitenhage Series. 171 



ters, it is not easy to make a detailed comparison, and it must suffice 

 to have drawn attention to the apparently close resemblance between 

 these shells. In his employment of the generic name Delphinula 

 for forms such as these, Miiller follows the usage of Stoliczka. 

 Fischer has restricted the use of the name to living types, but it has 

 been applied to certain T^rfo-like shells of Jurassic and Cretaceous 

 age by several leading authorities." In the case of the single speci- 

 men here dealt with, while it may be considered most expedient in 

 the meantime to use the name Turbo as one of convenience, it 

 appears not improbable that better preserved material may even- 

 tually show that a separation is necessary. 



In the form of the whorl and the ornamentation great similarity 

 is also shown to the figure of a specimen from the Aptian of Sainte- 

 Croix, identified by Pictet and Campiche, perhaps wrongly, with 

 Turbo munitus Forbes, t The African specimen is much smaller 

 than this Swiss individual, but so far as a comparison with the figure 

 is possible, the general agreement is very close. The specimen 

 depicted by Pictet and Campiche in fig. 1 of the same plate has a 

 taller spire and less expanded whorls than the original of fig. 3, and 

 agrees much more closely with the typical T. munitus from the 

 English Lower Greensand, and correspondingly less closely with 

 this specimen from South Africa, apart from the differences in the 

 ornamentation. 



GENUS NATICA Lamarck. 



NATICA UITENHAGENSIS sp. nov. 



Plate VIIL, figs. 11, lla; ? figs. 10, Wa. 



Description. The shell consists of at least five whorls. The spire 

 is very short, the body-whorl overlapping rather more than one-half 

 of the preceding whorl and expanding relatively rapidly ; the body- 

 whorl occupies rather more than two-thirds of the whole height of 

 the shell. The spiral suture is somewhat deeply impressed though 

 not definitely channelled ; the upper part of each whorl, adjacent to 

 the suture, is slightly flattened to form a narrow rounded ledge, as 

 seen in profile, the outer limit of which is not sharply defined, but 

 forms a curved outline passing down into the rather flattened upper 

 half of the whorl. This flattening of the whorl above the middle 

 zone is most marked in the body-whorl of a well-grown individual, 

 and even a slight depression of the surface here may be developed 



* See remarks by Hudleston and Wilson (1), p. 20; also Stoliczka (1), p. 368 

 (1868). 

 f Pictet and Campiche (1), 2* Partie, p. 480, pi. Ixxxiv., figs. 3a-3c (1863). 



