b SUBANTARCTIC ISLANDS OF NEW ZEALAND. [Mollusca. 



Fam. PATELLIDAE, Guilding. 



Genus Nacella, Schumacher, 1817. 



IHstrihutinn. — Cape Horn was evidently the birthplace of Nacella and Pat in i gem ; 



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 (Gonlil). 18-1:6. 

 Patella ilhuinnata, Gould, P. Post. S.N.H., ii, 184(i, p. 1-19 ; U.S. Expl. Exp., xii, 

 p. 3-10, atlas fig. 441. Helcioniscus illuminata, Gould, Man. Condi. (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; :\Iiss. 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. \eon.. 1855. fig. 73. Nacella fuegiensis. Reeve, 

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

 p. 353. 

 //^afe. —Campbell Island (Filhol). 



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

 Kerguelen. Common on the submerged fronds of fioating kelp (Macrocystis). 



Genus Helcioniscus, Dall, 1871. 

 Distribution. — Indian and Pacific Oceans, but not found on the AmiM-ican shores 

 north of Chili. No species have been found in the Atlantic (3cean. 



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. Mai. S., vi, p. 349. Acmaea chatJiamensis, Pilsbry, Man. Conch. 

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

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

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



Helcioniscus stelliferus (Gmeliu), 1790. 

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

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

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

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

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

 Also North and South Islands of New Zealand. 



