270 Mr. L. Reeve on the Synomjmy of 



Cymbium Neptuni has an orange-fulvous shell, covered with a 

 thick olive-black epidermis. The shell of C. navicula is of a 

 white-mottled purple-red colour, with only a slight epidermis. 

 But a much more serious error has been committed by Mr. 

 Hanley (Ips. Linn. Conch, p. 237), and adopted by Mr. Lowe 

 (Proc. Linn. Soc. 1860, p. 190), in assigning these combined 

 species to the Valuta olla of Linnaeus. The result of my exami- 

 nation of this question will be found under C. olla. Dr. Gray 

 considers Mr. Broderip's C. patula to be the young of C. Nep- 

 tuni, but 1 have not been able to satisfy myself on this point. 



2. Cymbium {Yetus) navicula, Gmelin, Syst. Nat. p. 3467 ; Conch. 

 Icon. pi. 24. f. 15 a, b, c, d. 



Valuta navicula, Gmelin. 



Cymbium Persicum maculatum, Martini. 



Valuta Pepo, Solander. 



Neptuni (pars), Lamarck. 



Cymba Neptuni (pars), Broderip. 



Hab. West Africa. 



Martini was the first to recognize the distinction between 

 this and the preceding species, but the irregularity of his no- 

 menclature requires that a preference should be given to the 

 name of Gmelin. The shell of C. Neptuni is of a uniform fulvous 

 colour, covered with a thick, dark, fibrous epidermis ; while that 

 of C. navicula is of a characteristic red-brown mahogany colour, 

 mottled throughout in all stages of growth with whitish spots. 



3. Cymbium {Yetus) proboscidale, Lamarck, Anim. sans Vert, 

 vol. X. p. 382 ; Conch. Icon. pi. 19. f. 11. 



Valuta cymbium (pars), Linnaeus. 



praboscidalis, Lamarck. 



Cymba praboscidalis, Broderip. 

 Yetus proboscidalis (pars), Gray. 



Hab. West Africa. 



In this species, the animal envelopes its shell entirely with 

 the mantle, secreting a vitrified glazing over the surface, which 

 is generally roughened here and there with pimples, arising 

 from the intervention of particles of sand. The upper ledge 

 of the whorls is so produced as to form an unusually broad 

 hollow channel around the spire. 



4. Cymbium [Yetus) porcinum, Lamarck, Anim. sans Vert. 



vol. X. p. 383. 



Valuta cymbium (pars), Linnaeus. 

 Cymbium excavatum (pars), Martini. 

 Valuta par cina, Lamarck. 

 Cymba parcina, Broderip. 



