6 SUBANTARCTIC ISLANDS OF NEW ZEALAND. [MoUusca. 



Fam. PATELLIDAE, Guilding. 



Genus Nacella, Schumacher, 1817. 



Distribution. — Cape Horn was evidently the birthplace of Nacella and Patinigera ; 

 thence they have been distributed eastward to the Falkland, New Georgia, and 

 Kerguelen Islands by the eastward-sweeping Antarctic current, carrying them upon 

 seaweeds (Pilsbry). 



Nacella (Patinigera) illuminata (Gould), 1846. 



Patella illuminata, Gould, P. Bost. S.N.H., ii, 1846, p. 149 ; U.S. Expl. Exp., xii, 

 p. 340, atlas fig. 441. Helcioniscus illuminata, Gould, Man. Conch. (1), 

 xiii, p. 142, pi. Ixx, figs. 40-42. Nacella illuminata, Gould : Suter, P. Mai. 

 S., vi, p. 353. Patella terroris, Filhol, Compt. Rend., xci, 1880 ; Miss. I.C, 

 p. 529. 

 Hab. — Auckland Islands (Lieutenant Totten) ; Antipodes Islands ; Campbell 

 Island. 



Also Macquarie Island (A. Hamilton). 



Nacella (Patinigera) fuegiensis (Reeve), 1855. 



Patella fuegiensis. Reeve, Conch. Icon., 1855, fig. 73. Nacella fuegiensis. Reeve, 

 Man. Conch. (1), xiii, p. 121, pi. xlix, figs. 28-31 ; Suter, P. Mai. S., vi, 

 p. 353. 

 ^a6.— Campbell Island (FUhol). 



Also Macquarie Island (A. Hamilton), Tierra del Fuego, Falkland Islands, 

 Kerguelen. Common on the submerged fronds of floating kelp {Macrocystis). 



Genus Helcioniscus, Dall, 1871. 



Distribution. — Indian and Pacific Oceans, but not found on the American shores 

 north of Chili. No species have been found in the Atlantic Ocean. 



Helcioniscus radians affinis (Reeve), 1855. 



Patella affinis. Reeve, Conch. Icon., 1855, fig. 108. Helcioniscus affinis. Reeve, 

 Man. Conch. (1), xiii, p. 140, pi. Ixix, figs. 32, 33. Nacella earlii. Reeve: 

 Hutton, C.M.M., p. 45 (not of Reeve). Helcioniscus radians affinis, Reeve : 

 Suter, P. Mal. S., vi, p. 349. Acmaea chathamensis, Pilsbry, Man. Conch. 

 (1), xiii, p. 56, pi. XXXV, figs. 43-46 ; Suter, I.e., vii, p. 326. 



Hab. — Disappointment Island, Auckland Islands (Captain J. Bollons). 

 Also North and South Islands of New Zealand, and Chatham Islands. 



Helcioniscus stelliferus (Gmelin), 1790. 



Patella stellifera, Gmelin, Syst. Nat., ed. 13, p. 3719. Helcioniscus stdlifera, Gmel., 

 Man. Conch. (1), xiii, p. 141, pi. Ixx, figs. 43-45; Suter, P. Mal. S., vi, 

 p. 350. Patella stellularia, Quoy and Gaimard, Voy. " Astrolabe," Zool., iii, 

 1834, p. 347, pi. Ixx, figs. 18-20. 



Hab. — Campbell Island, on rocks (Captain J. Bollons). 



Also North and South Islands of New Zealand. 



