332 Dr. Gwyn Jeffreys on 



the types of several so-called species, both recent and fossil, I 

 am convinced that the following must be considered synonyms 

 of the present species — Defrancia nohilis, scalaris, and Wood- 

 tana of Moller, Tritonium roseiim of M. Sars, Bela aviericana 

 of Packard, and P. Dov)soni and rohusta of S. V. Wood. P. 

 harpularia of Couthouy may be distinct ; but it is question- 

 able. Donovan published his specific name angulatus in the 

 same year as Montagu ; and that name might be adopted if 

 Brocchi's name turricula^ given in 1814 to a fossil and sub- 

 Apennine species of Pleurotoma^ be not changed. But it 

 seems a pity to disturb the name by which the present species 

 is so well known. Bela constitutes only a section or division 

 of Pleurotoma ; and consequently that will not help us. 



Pleurotoma exarata^ Moller. 

 Defrancia exarata, Moller, Ind. Moll. Groenl. p. 12. 



Godhavn, 5-20 fms. ; Waigat Strait, 15-25 fms. ; Station 1, 

 175 fms. ; 5, 57 fms.; Holsteinborg, 10-30 fms. ^Porcu- 

 pine ' Expedition, 1869, off the west of Ireland, 164-1230 fms. 

 Greenland (Moller and others) ! Iceland (Morch). Norway 

 (Loven and others) ! Eastern coasts of North America 

 (Couthouy, Whiteaves, and others) ! Fossil : Red Crag (A. 

 Bell). Labrador (Packard). 



Closely allied to some of the varieties of P. tumcida ; but 

 the canal is shorter and the base broader. 



Reeve called this species P. Molleri ; and he stated that it 

 was the Pefrancia Iqctea of Moller, a name which is not to be 

 found in the work of the last-named author. 



Pleurotoma Trevelyana^ Turton. 



Pleurotoma TreveJlianum, Turton in Mag. Nat. Hist. vii. p. 351 (1834). 

 See ' British Concliology,' iv. p. 398, as to the emendation of the 

 specific name. 



Var. SmitMi. Shell smaller ; ribs more prominent, but not 

 extending below the upper half of the body -whorl, and some- 

 times altogether wanting ; infrasutural keel stronger ; spiral 

 strice slighter, and consisting of impressed lines ; there is no 

 reticulation. 



Station 4, 20 fms. ; 5, 57 fms. ; Holsteinborg, 10-12 fms. 

 Massachusetts Bay (Stimpson) ! Gulf of St. Lawrence (Whit- 

 eaves) ! Newfoundland (Verkriizen) ! 



The typical form inhabits the North Atlantic, from Spitz- 

 bergen to Yorkshire, and from Port Kennedy to the Gulf of 

 St. Lawrence, at depths of 6-189 fathoms. Dr. Philip Carpenter 

 has recorded it from the west coast of North America. It is 

 one of the usual glacial fossils of Great Britain, Scandinavia, 



