MUSEUM OF COMPARATIVE ZOOLOGY. 133 



Super-Family RHACHIGLOSSA. 



The connection of this p^ronp witli the Toxopjlossa has been already shown 

 to be intiiuate, as illustrated l)y the radula of Spirotropis, at once Toxo;^lossate 

 and Ilhachiglossate. Doubtless the two series should be combined under one 

 head, and thus opposed to the Taiuioglossa. But until more ia known, I prefer 

 to leave the nominal arrangement undisturbed. 



Family OLIVIDiE. 



Genus OLIVA BRUGiizRB. 



Oliva reticularis Lamarck. 



OUva reticularis Lam., Ann. du Muse'um, XVI. p. 314. Tryon, Man. Oliva, p. 83, 

 pi. XXX. figs. 90-100, 1-4. 



A fresh specimen was obtained in V3 fms., at Station 290, near Barbados, 

 and a young dead specimen in 54 fms., near the island of Sombrero. 



This beautiful shell lives in the sand, for the most part too deep to be 

 reached by the trawl, which may explain their comparative absence from the 

 collection while so common in the region visited. 



Oliva litterata Lamarck. 



Plate XXXIV. Figs. 8 a-o, 8'. 



Oliva litterata Lam., Ann. du Museum, XVL p. 315; Say, Am. Conch., IIL p. 152, 



1830. 

 Oliva Sai/ana Ravenel, Cat., p. 19, 1834. 



Fragments occurred in several dredgings, but the species lives in shallow 

 water, on sand flats. 



Genus OLIVEL.LA Swainson. 

 Olivella mutica Sat. 



Plate XXXIV. Fiffs. 1 a-r, 2. 



Oliva mutica Say, Journ. Acad. Nat. Sci. Phil., II. p. 228, 1822. 

 Olivella zonalis Conrad, Journ. Acad. Nat. Sci. Phil, VII. p. 153, 1834. 



This species occurs in fragments, evidently disgorged by fishes in deep 

 water, but- lives only on the shores, in shallow sandy places. 



The animal has the posterior filament to the mantle, like Oliva, but wants 

 eyes and tentacles, while possessing an operculum which is denied to Oliva. 

 According to Stimpson, there does not seem to be any proboscis in Olivella 



