234 MAZATLAJf UNIVALVES % 



thority. The differences in the Mazatlan shells appear too 

 trifling to found specific distinction upon them. The characters 

 of the shell can only be seen in the young state ; in its ordinary 

 form, it has the external aspect of the British Osiliniis (Troc- 

 hocochlea) lineatus ; from which the unibiHcated axis and 

 nodulous columella at once distinguish it. Long. 1"17, lat. 1'08, 

 div. 70°. 



Sah. — China, Mus. Cuming. [?] — Mazatlan ; very rare ; 

 L'pool Col. 



Tablet 1130 contains the largest and smallest specimen. — 

 1131, 1 sp. lip tinged with orange. 



292. OiiPHALirs viEiDULUs, Ghnel. 



Trochus viridulus, Gmel. p. 3574. — Schreib. Conch, vol. . 



p. 2^.—Dillw. Bescr. Cat. p. 777, no. ^.— Wood Ind. Test. 



no. 42, pi. 28, p. 136. 

 Omphalius viridulus, S. Sf A. Ad. Gen. i. 429. 

 Globulus ex viridi et rubro variegatus, Chemn. vol. v. p. 114, 



pi. 171, f. 1677 : — (non Trochus variegatus, Chemn. p. 101, 



f. \mi-2:—I>illw. p. 774, no. 35:— =T. Capensis, Gmel. 



p. 3573 : Hah. 'Cape of Good Hope.') 

 Phorcus variegatus, A. Ad. in Proc. Zool. Soc. 1851, p. 156. 

 = Trochus Brazihanus, IfJi-e. teste A. Ad. loc. cit. 

 + Trochus B\Tonianus, Wood Siippl. p. 16, pi. 5, no. 17. 



^jHfli. "Sandwich Is.') 

 Var. = Trochus reticulatus, Gould, ms. Cat. 

 Comp. O. cruciatus, Gmel. (non Linn, teste Phil., Brazils) : — 



= 0. Brazilianus, 3fl-e. = 0. BjTonensis, teste Mus. Cum. 



The single specimen which Mr. Cuming assigns to this very 

 variable species, differs from all forms of O. ligulatus in the 

 following particulars. Spiral lirte, both above and below, miich 

 fewer, with broad interspaces. Umbilicus somewhat cork- 

 screw shaped, the parietal callosity being further off from 

 the centre, while the spiral ridge is nearer to it. It appears 

 also to want the seminodulous callous ridge at the base of 

 the labrum. Colour dull red, slightly spotted with orange. 

 Long.-U, lat. 76, div. 90°. 

 JT«&.— Mazatlan, Col. Jciceit.— Do. ; 1 dead sp. ; L'pool CoL— 



San Diego ; very red variety ; Lieut. Wthh. 



Tablet 1132 contains the specimen. 



