188I.J THE SURVEY OF H. M.S. 'alert.' 31 



verse ridges, but only five, on the upper whorls ; they are only 

 slightly rounded, become nodulous on crossing the longitudinal 

 costae, and are very finely striated in a spiral or transverse direction. 

 The largest example is only 11 millims. long, vFhilst that described 

 by Phihppi had a length of 16^-. 



MoNocERos CALCAR, Martyn. 



Hab. Station 1 ; and Francisco Bay, shallow water. 



CoNCHOLEPAS PERUVIANA, Lamarck. 

 Hab. Station 4. 



Ranella vexillum, Sowerby. 



Synon. Triton ranelliformis. King, = Ranella Icingii, D'Orbigny, 

 perhaps = R. tumida, Dunker, and Bursa (Apollon) proditor, 

 Frauenfeld. 



Hab. Tom Bay and Trinidad Channel. 



Dunker' s R. tumida was described from specimens from New 

 Zealand. I have compared series from that country, received from 

 different sources, with several specimens from Patagonia and Ciiili. 

 The result at present is, that I cannot detect any substantial diffe- 

 rence between the two local forms. This is very remarkable, as I 

 am not aware of any other mollusk having been shown to be com- 

 mon to these two localities. The variety {proditor) from St. Paul's 

 Island, in the Indian Ocean, is also very closely related to, if not 

 conspecific with, the South-American shell ; but the form is a little 

 narrower, and the penultimate whorl is conspicuously broad. 



Priene magellanica, Chemnitz. 

 Triton cancellatum, Lamarck. 



Hab. Puerto Bueno, Trinidad Channel, Tom Bay, and Portland 

 Bay. 



This species is included in the list of Japanese Fusidce given by 

 A. Adams in the 'Journal' of the Linn. Soc. 1864, vol. vii. p. 106. 

 Reeve also states that it is found at Kamtschatka ; and Carpenter 

 observes (Suppl. Report Moll. West Coast N. A., from the Report 

 Brit. Assoc. 1863, p. 534) that "P. cancellata is the Cape-Horn 

 species. Some specimens in alcohol in Sir E. Belcher's collection, 

 however, said to be from Icy Cape, greatly resemble the southern 

 shell," If, indeed, this species inhabits such remote parts of the 

 globe as Japan and the Straits of Magellan, it is most unaccountable. 



The operculum is ovate, with an almost terminal nucleus ; and 

 the internal scar has a subcentral nucleus, with concentric lines of 

 growth placed obliquely across the surface. The outer marginal 

 thickening is moderately broad. 



I think that the Chemnitzian name magellanica must be retained 

 for this species. It has priority over the Murex magellanicus of 

 Gmelin, which is the Trophon geversianus of Pallas ; and it appears 

 to me that Lamarck very unnecessarily substituted a fresh name 

 {Triton cancellatum) for this species. Besides, Gmelin had already 



