STROMBID^. 1 91 



When young, the outer lip of the shell is simple, resembling 

 that of Strombus ; the claws are gradually formed with the 

 growth of the shell and are at first open canals, which afterwards 

 become closed and solid. 



Messrs. Adams adopted two of Klein's names for subgenera 

 having no good characters ; these may be advantageously re- 

 placed by Prof. Theo. Gill's arrangement, as follows : 



PTEROCERA, Lam. (restricted). Anterior canal straight or 

 curved to the right, posterior canal ascending the spire. 



HARPAGO (Klein), H. and A. Adams. Anterior and posterior 

 canals both curved to the left, the latter at first crossing trans- 

 versel}^ to the length of the shell. P. rugosa, Sowb. (lix, 63). 



PHYLLOCHEiLUS, Gabb, 1868. (Malaptera, Piette, 1819.) Outer 

 lip with no digitations, or small ones only ; inner lip expanded 

 as a thin plate over the front of the body-whorl, and sometimes 

 projecting bej^ond it laterally ; both outer and inner lips deeply 

 notched anteriorly, near the canal. P. speciosa, d'Orb. (Ix, 74). 



RosTELLARiA, Lam. 



Etym — Bostellum, a little beak. 



Sy7i. — Fusus, Humphr. Gladius, Klein. Platyoptera, Conr. 

 Rostellum, Montf. 



Distr. — 8 sp. Red Sea, India, Borneo, China. Range, 30 fms. 

 R. curta, Sowb. (lix, 64). 



Animal with digitated mantle-margin. Operculum not serrated. 

 Shell fusiform with elevated spii*e, whorls smooth ; aperture 

 continued into a long, straight or slightlj^ curved anterior canal ; 

 outer lip slightly thickened on the margin and denticulated. 

 The (restricted) Rostellarias belong to the present epoch, or 

 extend at most only into the more recent tertiaries. 



HiPPOCHRENES, Montf. Posterior canal extending up the spire 

 to near the apex, or curving behind it ; lip much expanded. An 

 Eocene group ; Europe and America. R. macroptera, Lam. 

 (Ix, 75). 



RiMELLA, Agassiz. Whorls cancellated, posterior canal running 

 up the spire, anterior canal short. Cretaceous — recent. B. cris- 

 pata, Bowb. (lix, 65 . 



LEiORHiNUS, Gabb. Fusiform, spire about as long as the 

 aperture ; columella slightly twisted and with a fold or thick- 

 ening on the edge, extending to the end of the canal ; inner lip 

 thickened and with one tooth near the suture ; outer lip thick- 

 ened posterior to the edge ; edge thin and incurved, with a small 

 emargination posteriorly, and opposite to the tooth on the inner 

 lip ; no anterior sinus ; surface smooth or only marked b}^ lines 

 of growth. P. prorw^a, Conrad I Ix, 92). Eocene; Ala. Gabb 

 placed it in Pleurotomidae, but it was subsequently referred 

 here by Conrad and Meek. 



