132 Rev. Canon Norman's Bevision 



56° 13' N., lon£?. 14° 18' W., 420 fathoms ; west of Shetland, 

 St. 73, lat. 60° 39' N., long. 3° 9' W., 203 fathoms. 



It is found in Norway, generally within the Arctic Circle, 

 in the Gulf of St. Lawrence, and off the N.E. American 

 coast. 



8. Bela exarata (Moller). 



Defrancia exarata, Moll. /. c. p. 85. 



Tritonimn imtrulmn, Lov^u, CEfvers. Vet.-Akad. Forh. (Index Moll. 



Scand.) 1846, p. 145. 

 Bela exarata, G. O. Savs, I. c. p. 232, pi. xvi. fig. 18, 

 Bela nitrvla, id. ib. p. 233, pi. xxiii. fig. 9. 

 Bela concinmda, Veirill, Trans. Connect. Acad. vol. v. pt. 2 (1882), 



p. 468, pi. xliii. fig. 15, and pi. Ivii. fig. 11. 

 Pleurotoma exarata, Jeffreys, Ann. & Mag. Nat. Hist. ser. 4, vol. xix. 



(1877) p. 332. 



'Porcupine' Expedition, 1869, "164-1230 fathoms off 

 the west of Ireland " {Jefrei/s), that is, St. 25, lat. 56° 41' N., 

 long. 13° 39' W., near Rockall ; and St. 17, lat. 54° 28' N., 

 long. 11° 44' W., to the west of Donegal Bay. 



Its distribution is Norway, Arctic Ocean generally, and 

 North-east America. It is fossil in the Crag {A. Bell). 



9. Bela turricula (Montagu). 



Jeffreys, in his account of the 'Valorous' Mollusca, writes: — 

 " The sculpture is extremely variable. Having before me a 

 large number of specimens from various parts of the North 

 Atlantic, and after a careful examination and comparison of 

 types of several so-called species, both recent and fo.ssil, I am 

 convinced that the following must be considered synonyms 

 of the present species : — Defrancia iwhilis, scalaris, and 

 Woodiana of Moller, Tritonimn roseum of M. Sars, Bda 

 americana of Packard, and Pleurotoma Dowsoni and rohusta 

 of S. V. Wood. P. harpularia of Couthouy may be distinct, 

 but it is questionable." 



It is therefore doubtful whether any or which of the forms 

 here referred to as synonyms were procured in the * Porcu- 

 pine ' Expedition. 



I am myself inclined to regard B. scahiris and B. nohilis 

 as iorms of turricula; and, judging from Searles Wood's 

 figures, P. Dowsoni and robusta are also referable to it. 

 1 would, moreover, include Lkla exarata, but hesitate as to 

 B. rosea, and 1 doubt if the shell so called by Sars has been 

 found in our seas, though Jeffreys records it from Oban. 



B. turricula is very variable in sculpture in British seas, 

 but the lattice-work is always less raised than in the 

 Norwegian B. scalaris and nobilis, though of similar 



