34 SUBANTARCTIC ISLANDS OF NEW ZEALAND. [Mollusca. 



pi. iii, figs. 27-29 ; Schwedische Sudpolar Exped., vi, 1, 1908, p. 8. S. re- 

 dimiculum. Reeve, Conch. Icon., ix, 1856, pi. v, fig. 24 ; Martens, Deutsche 

 Tiefsee Exped. " Valdivia," p. 72 : Melvill and Standen, Scottish Nat. 

 Antarctic Exp., p. 142. Kerguelenia redimiculum, Reeve : Rochebrune 

 and Mabille, Miss. Cap Horn, p. 29. S. tristensis, Leach: Watson, Chall. 

 Rep. XV, p. 675 (not of Leach). 

 Hah. — Antipodes Islands ; Auckland and Disappointment Islands (Professor 



Benhani. Captain J. Bollons) ; Campbell Island (Professor Chilton). 



Also Macquarie Island, Tasmania, Kerguelen, Patagonia, Strait of Magellan, 



and Falkland Islands. 



Fam. PHENACOHELICIDAE, Suter. 

 Genus Allodiscus, Pilsbry, 1892. 

 DistribiUion. — New Zealand, Tasmania, and Australia. 



Allodiscus planulatus (Hutton), 1883. 



Charopa planulata, Hutton, N.Z. Journ. Sci., i, 1883, p. 477. Psyra planidata, Hutton, 

 T.N.Z.I., xvi, p. 202. Gerontia {Allodiscus) planidata, Hutton : Pilsbry, 

 Man. Conch. (2), viii, p. 67. Flammvlina {Allodiscus) planvlata, Hutton : 

 Pilsbry, I.e., ix, p. 15, pi. iii, figs. 4-6. 



Hab. — Auckland Islands (Professor Benham). 



Three specimens were found under logs. The perforation is a little more open 

 than in the type, otherwise there is no difference. The species is widely distributed 

 over the North and South Islands of New Zealand, but is nowhere common. 



Genus Thermia, Hutton, 1904. 

 Disfribution. — New Zealand only. 



Thermia (?) expeditionis, n. sp. (Plate I, figs. 6-8.) 



Shell small, depressed globose, umbilicated, very thin, translucent, somewhat 

 shining, radially plicately ribbed. Sculpture : protoconch microscopically spirally 

 striate, the succeeding whorls with radial rounded and flexuous riblets, about 10 per 

 millimeter, slightly inequidistant, and getting obsolete upon the base. Colour 

 uniformly olive. Epidermis thin and slightly polished. Spire depressed conoidal, 

 its height less than that of the aperture. Protoconch of 2 slightly convex whorls. 

 Whorls 41, regularly increasing, flatly convex, periphery of last whorl rounded, very 

 faintly angled ; base convex. Suture deep. Aperture oval, somewhat excavated 

 by the parietal wall, which is lightly convex. Peristome sharp, simple. Columella 

 vertical, the inner lip slightly reflexed. Umbilicus narrow, open, deep. 



Diameter— Maj., 2-9 mm. ; min., 2-5 mm. Height, 2 mm. 



Animal unknown, and therefore the generic position somewhat uncertain. 



Type in the Canterbury Museum, Christchurch. 



Hnh. — Auckland Islands, under a log, (me specimen only (Professor Benham). 



