322 BEV. E. B. WATSON ON THE 



(as B. variegatum), Aquat. Obs. p. 53, f . 4 ; Lamarck (as 

 T. variegatum). An. s. Yert. Yii. 178 ; & 2nd ed. Desh. ix. 

 623 ; Deshayes (as T. variegatum), Encycl. Method, iii. 

 1054, plates vol. in. ccccxxi. 2 «, & (the nomenclature of 

 the plates being by Bory de St. Vincent, Aug. 1, 1824, the 

 bext by Deshayes in 1832); Philippi (as T. tritonis), 

 Enumeratio, i. 212, & ii. 183 ; Kiener, Iconog. (do.) vol. Tin. 

 28, ii. ; Eeeve, Concli. Icon, (do.) vol. ii. i. 3 & ii. 3. (L., 

 N., W.) Eunchal, Piedade. Not very uncommon. 



351. Trochus {Clanculus) Bertheloti, 1839, d'Orbigny (as Jfo^o- 



donta), Moll. Canaries, p. 81, vi. 17-20 ; Philippi, Concb.- 

 Cab. 2nd ed. vol. ii. pt. 3, p. 271, xxxix. 17 ; Eiscber in 

 Eiener, Iconog. vol. xi. p. 295, xcv. 1. Sah. Madeira. 

 (M., L., ]Sr., Jn., W.) From tbe Gorgulho to Punta de Sao 

 Lourenco and Porto Santo. Not abundant. — For tbe 

 original definition of Clanculus by de Montfort see Concb. 

 Syst. 1. 191. Adams's definition I am unable to understand. 

 The umbilicus in tbe T. Bertheloti is a true, not a " false " 

 one, and though turreted like a corkscrew is perforated 

 to the very apex. The one most prominent feature by 

 whicb de Montfort difi'erentiates tbe group is tbe umbilicus, 

 and to alter his definition to " perforee ou non ombiliquee " 

 is impossible. 



352. TrocJius (Gihhula) Oandei, 1839, d'Orbigay, Moll. Canar. 

 p. 82, vi. 21-23 ; Philippi, Concb.-Cab. 2nd ed. vol. ii. pt. 3, 

 p. 227, xxxiv. 15. Hah. Canaries. (L., IS"., Jn., W.) 

 Everywhere ; extremely common both in its typical form and 

 in that of the umbilicated var. of T. Saulcyi, of which 

 d'Orbigny made a separate species. 



353. Trochus {Trochocochlea) coliihrinus, 1849, Gould, Bost. Soc. 

 Nat. Hist. III. 107; Exploring Exped., Shells, p. 183, 

 fig. 223; Watson, 'Challenger' Report, p. 63. Rah. 

 Canaries and Madeira. (L., N., Jn., W.) Everywhere ; 

 excessively common. — The name T. Sauciatus, Kocb, as of 

 earlier date, has been suggested for this species, but for 

 Gould's species tbere is certainty, while for Kocb's tbe 

 babitat is unknown and the description — "centrum" of 

 tbe base " vertieft und schwarz-rotbgefleckt " — is quite 

 inapplicable. Does any one know what Koch's species 

 was ? My lamented friend Dr. Fiscber, whose knowledge 

 and judgment were equally trustworthy, regarded (see 



