OBSERVED AT MOGADOR. 193 



Lam. (uot Linn.). The deep narrow sutiiral channel and distinct 

 thickened inner lip distinguish both my own and Webb's Canarian 

 specimens from all these shells ; as does the greater ponderosity 

 and thickness from at least the two former species. My three 

 Lanzarotan examples of var. fi are from 5^^ to 5^ inches long, and 

 from 2^ to nearly 3 inches wide. They are plain-coloured, or at 

 most only partially and indistinctly mottled. My fourth Lanza- 

 rotan example, from Webb himself, is, however, as before stated, 

 more distinctly mottled all over. D'Orbigny's two in the British 

 Museum, marked V. porcina, perfectly resemble these in every 

 respect. His third Valuta, marked V. Neptuni, is a smaU, dwarf, 

 shorter and more ventricose form or state of precisely the same 

 shell, with the aperture wider than usual, bleached, and worn down 

 to a dull marble-like whiteness. 



4. Ctmbium proboscidale {Lam.). 

 Valuta proboscidalis, Lam. 



Plaits 4 ; shell thin, light, subinflated, large, boat-shaped or 

 fusiform-cylindric, contracted at each end ; spire very short, its 

 mammilla soon obliterated, small, and sunk below the top of the 

 last volution ; sutural groove broad, concave, soon becoming obso- 

 lete or confluent over the mammilla, and forming at the top of the 

 shell a cup-shaped hollow, its lip or edge erect, subreflected or 

 curved outwards, acute ; shoulder sharply angular, prominent, 

 remote from the spire ; aperture reaching beyond or to the level of 

 the apex ; outer lip curved convexedly ; inner lip none. Colour 

 plain ferruginous-chestnut or tawny-brown. Size 8-10 or 12 in. 

 long, 4-5 or 6 wide. 



V. prahascidalis, Lam. ed. 2. x. 382 ; Swains. Exot. Couch, (no 

 fig. in my copy). Gymha prahoscidalis, Sowerb. Gen. ; Sp. Conch. 5. 

 f. 5 d, adult ; 5 c, jun. ; 5 a, h, pull. 



Hah. "African Ocean," Soioerhy. 



Dr. Gray, in Proceed. Zool. Soc. 1855, p. 52, unites this species 

 with the following {Valuta porcina, Lam.), of which it may possibly 

 prove, indeed, to be only a large mature or full-developed state or 

 form. But further observations of the shells and animals con- 

 jointly seem still requisite to justify such combinations. 



5. Ctmbium porcinum {Lam.). 

 Valuta Ci/mbimn, L. ! 

 Plaits 2, rarely 3 ; shell thin, light, rather small, narrow-oblong, 



