of British Mollusca. 129 



fornicata, which were no doubt livina; on the oysters when 

 imported, but all seemed to have perished. 



(16) Chaster, G. W. — " Adeorbis unisulcatus, new Species 



from the Irish Coast," Journ. Conchol. vol. viii. 

 1895-7, p. 373. 



(17) Marshall, J. T.— "The Marine Shells of Scillj," 



Journ. Conchol. vol. viii. 1895-7, p. 431. 



(18) Garstang, W. — '^ On the Gastropod Colpodaspis pusilla 



of Michael Sars," Proc. Zool. Soc, Nov. 1891, p. 661. 



(19) Garstang, W. — " The Aplacophorous Amphineura of 



the British Seas," Proc. Malacol. Soc. vol. ii. 1896, 

 p. 123. 

 In this interesting paper, under '' Fam. I. Chsetoderma- 

 tidge," Mr. Garstang- writes : "No British representatives." 

 Chcetoderma nitidulum is, however, a member of the British 

 fauna. It was dredged by the German expedition in 37 

 fathoms in the " Silver pit," which is to the west of the 

 Dogger Bank, and nearly east of Hull, and was described 

 and figured by Mobius under the name Crystallophri.sson 

 nitens. See ' Jahresbericht der Commiss. zur wissensch. 

 Unters. der deutschen Meere in Kiel fiir die Jahre 1872, 

 1873, 1875/ p. 157, pi. iii. figs. 6-12. 



(20) Jordan, H. K. — " Some new Species of British Mol- 



lusca from the 'Triton' Expedition, with a List of 

 other Species new to the Faroe Channel," Proc. 

 Malacol. Soc. vol. i. 1895, p. 264. 

 Some of these species I cannot receive, according to my 

 views, as ''British;" and the records of localities are most 

 unsatisfactory — " Warm Area " being usually given without 

 any reference to even station, still less to latitude and longi- 

 tude. Mr. Jordan differs from me as regards the limits of 

 the " British Area," as he has a perfect right to do. But 

 I trust that naturalists will weigh what I have written on 

 this matter, and examine carefully with charts the condi- 

 tions of the sea-bottom in the disputed area, together with 

 Sir John Murray's description of the Wyville Thomson 

 Kidge and its effect upon this fauna in the ' Knight Errant ' 

 and ' Triton ' Reports ; and then my views will not be mis- 

 understood as tliey have been by Mr. Jordan. I do not ex- 

 clude the Faroe Channel only because the water is cold there, 

 but because it geographically belongs to Faroe and not to 

 Britain ; and the " Wyville Thomson Ridge " separates two 

 oceans, since it slopes to the south into the Atlantic, with 

 the " warmer area " of that ocean at 500 fathoms, and 

 descends to the north into the Arctic Ocean, with its " cold 

 area " of 500 fathoms. 

 Ann. & Mag. N. Hist. Ser. 7. Vol. iv. 9 



