Description of Eight new Species of Shells. Ill 



ences made to it by Dr. Gould, seems to differ from it bat slightly. 

 The ActcBoti, De Montfort, [Tornatella^ Lamarck,) is easily dis- 

 tinguished from these genera by the fold on the columella, and it 

 unquestionably has priority over Odostomia, Fleming, and Ja- 

 minia, Brown. There are also the genera Trmicatella, Cho- 

 ristoma, Alvania and Acmcea, which I have only met with* as 

 synonymes to Rissoa. 



Genus Action.— Z)e Montfort. 

 A. parvus. PL 1, fig. 7. 



A. testa acuto-conoidea, sub-tenui, Icevi, alba, umbilicata; spira 

 acuta; anfractibus quinis, planulatis ; suturis linearibus ; ultimo 

 anfractu sub-angulato ; umbilico parvo; apertura ovata, effusa; 

 columella uniplicata ; labro acuto. 



Shell acutely conical, somewhat thin, smooth, umbilicated ; 

 spire acute ; whorls five, flattened ; sutures linear ; last whorl sub- 

 angular ; mouth ovate, somewhat effuse ; columella with one 

 fold j outer lip acute. 



Length -075. Breadth -037 of an inch. 



Hab. Delaware Bay. Cabinet of I. Lea. 



Remarks. — In this little species there is nothing very remark- 

 able. The mouth is -025 of an inch in length, and not very 

 acutely angular above. It appears to have a thin, horny opercu- 

 lum, though from the extremely small size of the shell, I cannot 

 be certain as to that point. The only one of our species with 

 which it can be confounded, is the Actceon trifdus, Totten, but 

 the umbilicus, want of transverse striae, and the difference in the 

 shape of the mouth, will immediately distinguish it from that 

 shell. It bears considerable resemblance to one or two fossil spe- 

 cies described by M. Grateloup,t from near Dax, in France. 

 Genus Cerithium. — Bruguiere. 

 C. cancellatuin. PL 1, fig. 8. 



G. testa turrita, sub-tenui, tenebroso-fusca, sub-perforata, cancel- 

 lata, sulcis longitudinalibus, striisque transversis ; spira acuta ; 

 anfractibus octonis, convexis ; suturis sub-profundis ; basi brun- 

 nea; apertura elliptica, supra angulata, infra sub-canaliculata; co- 

 lumella brunnea; labro acuto; operculo nigro. 



Shell turrited, somewhat thin, dark brown, sub-perforate, can- 



* The three first genera in Philippi's " Enumeratio Molluscorum Siciliae," and 

 the last in Cuvier's "Animal Kingdom." 



t Transactions of the Linnaean Society of Bordeaux, for November, 1838. 



