110 DR. GWYN JEFFREYS ON THE MOLLTJSCA OF THE [Mar. 6, 



Isles, Finmark to Gulf of Gascony, Algiers {Joly) !, Greenland to 

 New York, Alaska to N. Japan ; 0-36 fms. Inhabits the laminarian 

 zone. 



Fossil. Pliocene ? : Antibes. Post-tertiary : Scandinavia and 

 British Isles ; 0-1360 ft. 



Variable and therefore polyonomatous. Among these names are 

 Turbo vinctus, T. quadrifasciatus, and T. canalis of Montagu ; L. 

 solidula, L. labiosa, and L.frigida of Loven ; L.fabricii and L. arctica 

 of Philippi ; L. fusca of Say ; and L. pertusa of Conrad. Brown 

 made out of it four species of Phasianella, and Leach his genus 

 Epheria. 



3. Lacuna puteolus, Turton. 



Turbo puteolus, Turt. Conch. Diet. p. 193, f. 90, 91. 



L. puteolus, B. C. iii. p. 3J8 ; v. p. 205, pi. Ixiv. f. 4. 



•Lightning' Exp. St. 4. Drifted. 



Distribution. Greenland, Iceland, and Finmark to Vigo ; lami- 

 narian zone. 



Fossil. Post-tertiary : Clyde beds, Portrush, Selsea and Dorset. 



For the perplexing synonymy of this species I would refer to 

 ' British Conchology.' It is connected with L. pallidula through 

 Gould's L. neritoidea, which I consider a variety of the latter species 

 or an intermediate form. 



1. CiTHNA TENELLA, Jcffrej'S. 



Lacuna tenella, B. C. v. p. 204, pi. ci. f. 7. 



'Lightning' Exp. St. 5, 7. 



'Porcupine' Exp. 1869 : 4, 23, 23a, 36, 39-42. 1870 : Atl. 1, 

 3, 6, 9, 16, 17, 17a, Setubal B., off C. Espichel, 22, 31-34; Med. 

 51, 54, 55. 



Distribution. Between the Hebrides and Faroes (' Triton ' cruise), 

 Bay of Biscay (' Travailleur' Exp.), many parts of the Mediterranean 

 (Spratt, iV'flres, Ilonterosato, Italian and French Exps.), between 

 Gibraltar and the Azores (' Josephine ' Exp.), Azores, Pernambuco, 

 and E. of Japan ('Challenger' Exp.); 114-20.50 fms. 



Fossil. Pliocene: Calabria and Sicily (^S'e^uew^a). Post-tertiary: 

 Greenock (Crosskey and Robertson) ! 



Var. costulata. More or less strongly striated lengthwise, especially 

 on the upper whorls. 



In the 'Annals & Magazine of Natural History' for July 1870 I 

 proposed the generic name Hela for this species ; but I afterwards 

 found not only that the name had been preoccupied so long ago as 

 1830 by von Miinster in the Crustacea, but that the late Mr. Arthur 

 Adams had distinguished the same form of shell under the subgeneric 

 title of Cithna in the Proceedings of the Zoological Society for IS63. 

 His courtesy in sending me several species from Japan has satisfied 

 me that they belong to the same genus as mine ; and I therefore sub- 

 stitute Cithna for Hela as the generic name. It differs from Lacuna in 

 being destitute of an epidermis, and in having instead of a flattened 

 and channelled pillar an obliquely curved umbilical chink, which ends 



