188 KEY. E. T. Lowe's list oe shells 



vades the inside of tlie aperture, spreading over the ventral portion 

 of the last volution outside the pale enamelled pillar-lip. In the 

 larger adult shell, the spire is not exserted beyond the basal volu- 

 tion, and the tip of the apical mammiUa scarcely protrudes above 

 its rim. In aU four, the shape is oblong or cyliudric, the outer 

 lip nearly or quite straight, and the aperture not at all efluse. 



Adanson's PJdlm, t. 3. f. 2, is a very fair representation of this 

 smaller Mogadorian form of /3 ; whilst Buonanni's, 3. f. 2, referred 

 by Linnceus to his Voluta Olla (V. Neptuni, Gm.), and by Hanley 

 (Conch. Linn. 237, 238) to V. probosciilalis, Lam., belongs rather 

 to the larger Lanzarotan form of this var. Its well-defined deep 

 and nai'row sutural channel around the distinct projected mam- 

 miUa forbids its reference to V. prohoscidalis, Lam., which is also a 

 vastly larger, lighter, thinner, and altogether differently shaped shell. 



An examination, by favour of Dr. Gray and Dr. Baird, of the 

 original types of D'Orbigny's Vohita Neptuni and porcina, now 

 lodged with the rest of his, or rather Webb and Berthelot's, Cana- 

 rian Shells in the British Museum, proves them to belong indu- 

 bitably to C. rttbigiiiosiMii (Sw.), var. /3, Lowe, — a shell which 

 indeed is commonly brought to Lanzarote by the Spanish fisher- 

 men from the neighbouring coast of Africa, but which is not, at 

 least ordinarily, found on the shores of any of the Cauarian 

 islands themselves. In like manner, when M. D'Orbigny states 

 his V. prohoscidalis ("W. B. ii. 2. 86) to have been " recueillie sur 

 les cotes de I'ile de Lancerotte par MM. Webb et Berthelot," he 

 is at variance with the testimony of one of its alleged collectors 

 (Webb himself), who, in a letter to me dated " Teneriffe, Jan. 30th, 

 1830," i. e. only six months after his and M. Berthelot's joint 

 visit of six weeks to Lanzarote, and two weeks to Fuerteventura, 

 writes : " The reason that many of the shells I sent are in a bad 

 state is, that they are collected hy tlie fishermen on the opposite 

 continent of Africa, whereas scarcely anything is thrown up on 

 the rough and precipitous coasts of these islands." The three 

 typical examples, one miscalled by D'Orbigny V. Neptuni, and the 

 other two V. porcina, in the British Museum, identify themselves 

 amply by their battered, worn, and bleached condition, with those 

 apologized for in the foregoing extract, which has also reference 

 doubtless to a fourth Lanzarotan example of the same form or var., 

 4| in. long by 2\ in. broad, sent to me, with various other land 

 and sea mollusks, immediately after his return from Lanzarote to 

 Grand Canary in August 1829, by AVebb himself, and which is 



