RUB-OKI 'Kit !' 



PLATYPODA 



179 



l-'i.i. 981. 



Latirus cw//V "/"'">, 

 d'Orb. sp. Miocene ; 

 l.;ipui:y, Transylvania. 



oblong, outer margin relatively thin, crenulate ; columellar border slightly twisted, 



with two or three small obliijin- plait- 

 anteriorly; sometimes umbilirate. Cre- 

 taceous to Recent. 



Pisanella, v. Koenen. Oligocene. 

 Peristemia, Murrh ; Leucozonia, (Jray. 

 'IVrt iai-y and Recent. 



Family 0. Turbinellidae. 



Shell similar to those of the preced- 

 ing family, but with strong, horizontal 

 columellar folds. Tertiary and Recent. 



Turbinella, Lam. (Mazza, Adam- : 

 Mazzalina, Conrad). Thick - shelled, 

 ovate-conical, smooth ; spire short and blunt, body whorl 

 large ; canal straight, elongated. Eocene to Recent. 



Family 7. Volutidae. Gray. 



Shell thick, ovate to fusiform, dull or lustrous. Spire 

 short or long, body whorl large. Aperture elongated, with a 

 short canal or notch ; inner lip with 

 columellar folds. Operculum usually 

 absent. Cretaceous to Recent. 



This family, as here defined, contains 

 genera distributed by malacologists 

 amongst several families Marginel- 



lidae, Mitridae, and Volutidae all of which are characterised by 

 the strong development of columellar folds ; 

 but it is likely that this structure originated 

 independently in several phyla at intervals 

 remote from one another. The initiation of 

 well - marked genera with Volutoid plaits 

 occurred in the Cretaceous. Subsequently their 

 number increased, and a great many generic 

 types became differentiated. The phylogeny 

 of Tertiary and Recent forms has been ably worked out by Dall. 1 



Marginella, Lam. (Fig. 982). Shell oval or oblong, smooth, 

 glistening. Spire short; aperture narrow, slightly canaliculate 

 anteriorly. Columella with three or four oblique folds of about 

 equal size ; outer margin frequently thickened and dentate. 

 Tertiary and Recei t. 



Mitra, Lam. (Fig. 983). Fusiform to elongate - oval, solid; 

 spire high, acuminate ; aperture narrow, channelled anteriorly. 

 Columella with numerous oblique folds, the posterior plaits being 

 FIG. 983. often the strongest. Outer margin commonly thickened, and 



fusiformis, smooth internally. Abundant in the Tertiary and Recent. 



Turricula (Klein), Adams. Like the last, but shell transversely 



FIG. 



Fasdolaria Tarbellin i na,Gra.t. 

 Miocene ; Gnmd, near Vienna. 



IM.;. ;>S-2. 



rginella cr/i.^n'n. 

 Calcaire Gros- 

 Chaumont, near 

 2 /i- 



Brocchi. 

 Rhodes. 



Pliocene ; 



ribbed. Cretaceous to Recent. 



1 Bull. Museum Comp. Zoology, vol. XVIII., 1889 ; Proc. U.S. Nat. Museum, vol. XII., 1890 ; 

 Trans. Wagner Free Inst. Sci. Philad., vol. III., 1890. 



