158 Transactions. — Zoology. 



which has before been proposed for some other genus in zoo- 

 logy or botany, or for some other species in the same genus, 

 when still retained for such genus or species." The intrica- 

 cies of this biological law have recently been discussed by 

 several naturalists in the seventh and eighth volumes of the 

 sixth series of the "Annals and Magazine of Natural History." 



1. J. bitentaculata, Quoy and Gaimard, 1832. 



Synonym. — antipodarum, Gray, 1853. 



Illustrations. — Voyage de " 1' Astrolabe," Moll., pi. xiii.. 

 figs. 1, 2 (from which are copied : Genera Eecent Moll., 

 pi. lxxx., fig. 5; Struct, and Syst. Conch., pi. ci., fig. 51; 

 Figures Molluscous Animals, iv., pi. clxxx., fig. 15 ; Chenu's 

 Man. Conch., f. 3198) ; Trans. Linn. Soc, xxii., pi. 66, 

 figs. 1-3 ; and U.S. Expl. Exped., xii., pi. i., figs. 6, a, b, c. 



Descriptions. — Voy. "Astrolabe," vol. ii., p. 119; Ann. 

 Mag. Nat. Hist. (2), xii., p. Ill; Proc. Z. S., 1853, p. 112; 

 United States Exploring Expedition, vol. xii., p. 2; Zeitschrift 

 fiir Zoologie, xv., p. 81 ; New Zealand Mollusca, p. 27 ; Trans. 

 N.Z. Inst., xvi., p. 206, &c. 



Anatomy. — Trans. Linn. Soc, xxii., pi. 66, figs. 1-11 ; 

 Trans. N.Z. Inst., xiv., pi. v., figs. 12-16 : Keise im Archd. 

 Phil., iii., pi. xv., figs. 16, 17. 



Habitat. — Tasman -Bay, Wellington, Dunedin, Christ- 

 church, and Greymouth, New Zealand. 



Var. papillata, Hutton, 1879. 



Descriptions. — Trans. N.Z. Inst., xi., p. 332; op. clt., 

 vol. xiv., p. 159 ; op. cit., xvi., p. 206; Manual N.Z. Mollusca, 

 p. 27. 



Anatomy. — Trans. N.Z. Inst., xiv., pi. v., figs. 10, 11. 



Habitat. — Wellington and Dunedin, New Zealand. 



J. verrucosa, Von Martens, 1889. 



Illustration. — Nova Acta der Ksl. Leop. -Carol. Deutschen 

 Ak. der Naturforscher, Band liv., pi. iv., fig. 11. 



Description. — Op. cit., p. 77. 



Anatomy. — Op. cit., pi. iv., figs. 12-11. 



Habitat. — New Zealand. 



Var. nigricans, Von Martens, 1889. Op. cit., p. 77. 



Var. fasciata, Von Martens, 1889. :;: Op. cit., p. 79. 



Obs. — Probably this species is identical with J. biten- 

 taculata, var. papillata. 



* The name of this variety in " Nov. Acta" is fuscata, but Professor 

 E. von Martens, in a letter dated the 5th April, 1892, writes to me that 

 fuscata is a writing — or printer's — error, and that he called the variety 

 fasciata, because it is (in spirits) pale yellowish-white, with several inter- 

 rupted longitudinal lines of black. — H. Sutkr. 



