MUSEUM OF COMPARATIVE ZOOLOGY. 167 



large body whorl, and rapidly taperin<:j canal, it has no parallel amon^j recent 

 species. Its nearest niiative, and doubtless ancestor, is the Fusus Cdlooaaensis 

 Heilprin, fntin the Pliocene of the Caloosahatcliie River, Fh)rida, which has 

 very much such a spire, Ijut the whorls are appressed to the suture and the 

 sculpture is markedly dillerent in detail; the lirui of the outer lip are double, 

 and the shell is usually smaller than in the present species. 



In Fusus Ihnessus the soft parts are white, the operculum thick and solid. 

 Neither appears to differ from those ordinary to the genus. 



Fusus eucosmius n. s. 



Plate XXXV. Fig. 5. 



This shell is close to Fusus turriculus Kiener, from the Chinese coast, and is 

 best described by a comparison with it. The nucleus of turriculus is browu 

 and swollen, the first whorl being larger than the one which succeeds it; in 

 eucosmius it is smaller, white, and the second turn is larger than the first. 

 F. turriculus with eleven whorls measures 110.0 mm. long and 30.0 in diam- 

 eter. F. eucosmius with eleven whorls measures 85.0 by 23.5 mm. It has its 

 mouth relatively as well as actually smaller than the Chinese species; the 

 maximum diameter of the aperture in the latter enters 6. 1 times into the total 

 length, while in F. eucosmius it will enter 6.6 times. The average number of 

 transverse ribs in F. turriculus is ten, in F. eucosmia eight, while in the latter 

 they are usually more prominent, especially at the periphery, and the inter- 

 spaces are deeper. The color of the Chinese form is yellowish white, but most 

 of the Antillean specimens tend toward an orange hue like that of a ripe apri- 

 cot. In other features the two species are very similar, except that the inner 

 lip of eucosmius is always smooth, while in adult specimens of the Chinese 

 shell the equivalent surface is strongly irregularly Urate. 



Habitat. West Florida, in 60 fms. ; Station 11, in 37 fms., near Cuba; 

 Station 290, in 73 fms., sand, off Barbados, bottom temperature 70°. 7. Also 

 at U. S. Fish Commission Stations 2316, 2317, 2318, off Key West, in 45-50 

 fms., sand, temperature 75°.0, and 2402, in 111 fms., and 2411 in 27 fms., sand, 

 in the Gulf of Mexico. 



The specimens obtained by the Blake were all very young and imperfect. 

 The characters of the species could not have been made out without an exam- 

 ination of the Fish Commission specimens, most of which were adult and 

 living. 



Fusus Couei Petit. 

 Fusus Couei Petit, Journ. de Conchyl., IV. p. 249, pi. viii. fig. 1, 1853. 



Habitat. U. S. Fish Commission Stations 2411 and 2414, in the Gulf of 

 Mexico between Tampa and Dry Tortugas, in 26-27 fms., sand. 



