128 ROSTELLARIA. 



R. FUSUS, Linn. PI. 10, fig. 17 ; PL 11, fig. 21. 



Much more, slender than the preceding species, the spire and 

 canal longer, lip-margin toothed throughout, with five or six, 

 strong, well-marked short digitations ; yellowish brown, aperture 

 white. Length, 6-8 inches. 



China. 



It is R. clavus, Gmel., E. rectirostris , Lam., E. subulata, Scfhnm., 

 E. unicornis, Dillw. 



Yar. MELANOCHEILUS, A. Ad. Fig. 21. 



Lip between the digitations, and sometimes the interior of the 

 aperture stained purple-black. 



R. POWISII, Petit. PL 11, fig. 22. 



Closely spirally ridged, the interstices longitudinally striate, 

 canal short, lip-margin five-toothed, exteriorly thickened, yellow- 

 ish, or orange-brown, aperture white. Length, 2-2*5 inches. 



China. 



A somewhat rare shell ; a specimen was sold a few years ago 

 for 200 francs (Jour, de Conch., 228, 1877). 



R. FISSA, Dillw. PL 11, fig. 23. 



This shell, figured b}^ Chemnitz, has not been found in any 

 European collection, and nothing is known of its locality. It is 

 E. Favanni, Pfr., and E. serrata, Perry. 



R. DELICATULA, Nevill. 



Thin, translucent, pale ochraceous brown, lineated on the last 

 whorl with four narrow white bands each of which terminates in 

 one of the four digitate processes of the lip, canal shorter than 

 in the other species, first three or four whorls smooth, the next 

 three or four faintly but regularly spirally striated, the striae 

 becoming obsolete on the last two whorls, except at the base of 

 the body-whorl. L. 76 mill., of canal 6'5 mill. 



Arracan, dredged in deep water. 



Unfigured and unknown to me except by the original descrip- 

 tion published four years ago. 



R. MARTINII, Marrat. PL 11, fig. 24. 



Whorls with close punctate revolving striae throughout, bi- 



