22 



In this genus the notch or sinus is close to the canal, thus 

 differing from Strombus, in which a portion of the outer lip 

 intervenes. 



DESCRIPTIONS. 



Sp. 1. R. Curvirostrum. (pi. v. f. 9.) Enc. Met. Strombu3 

 Fusus. Gmel. 



T. crassa, lsevi, fusiformi ; apice plicato ; anfractibus numerosis, 

 convexiusculis ; canali postico, super anfractus penultimse partem, 

 decumbenti; canali antico brevi undato. 



This is the well known species with a short curved beak ; the 

 general colour is reddish brown, with the aperture white. 



Moluccas and Red Sea. 



2. R. curta. (pi. v. f. 7. 11.) nobis. Zool. Proc. 1842. 



T. R. Curvirostro simillima, sed anfractu ultimo breviori ; canali 

 recto. 



The last whorl of this species is shorter than of R. Curvirostrum, 

 and the canal is straight. There is a broad band of brown colour 

 close to the suture of the whorls. The specimen is in Mr. 

 Cuming's collection. 



3. R. Rectirostrum. (pi. v. f. 8, 10.) Lam. 



T. fusiformi, elongata, medio laevigata; anfractibus convexis 

 primis cancellatis, ultimo infra spiraliter sulcato, rostro elongato, 

 recto, gracili ; labio externo prope canalem posticum lobato, emar- 

 ginato; digitibus quinque ad sex. 



Much more graceful and slender in form than the two preced- 

 ing ; the whorls nearest the apex are cancellated; all of them are 

 ventricose ; the suture of the spire is deeper, and the digitation of 

 the outer lip commences nearer the posterior canal. The variety, 

 fig. 10, with wider aperture, and somewhat less slender form, may 

 possibly be distinct. The specimen is in the collection of Mr. 

 Cuming. China ? Sumatra. 



4. R. Povisii. (pi. v. f. 5, 6.) Petit. M. S.? 



T. turrita. ; anfractibus superne angulatis, spiraliter sulcatis ; 

 apertura angustata. ; labio interno crasso, labio externo crasso, 

 granulato, prope canalem posticum lobato ; digitis quatuor ; canali 

 postico recurvo ; canali antico rostrato, brevi. 



This species, which is spirally grooved, takes the general form of 

 Strombus Fissurella, but, like the other Rostellarise, has the outer 

 lip emarginated close to the canal. China. 



