204 Transactions. — Zoology. 



Var. a. — antipoda, Hombron and Jacquinot (1854). Pale horny 

 banded on both surfaces with brownish chestnut. 

 South Island. — Greymouth (Helms). 

 Auckland Islands (H. and J., H. Krone). 



Var./3. — aucklandica, Guillon (1842). Yellowish brown with red 

 spots on the upper surface only. 

 Auckland Islands. 



Allied to H. excavata, H. and J., from Tahiti. The Chatham Island 

 specimens are too much rubbed to say to which variety they belong. 



Sub-Sec. OxYGNATHA. 



Marginal teeth aculeate, the base longer than broad with a single long 

 curved point. 



Fam. Vitrinldm. 



Animal heliciform ; the mantle more or less reflected over the shell ; no 

 caudal mucous gland. 



Genus Troehomorpha, Albers. 



Shell umbilicated or imperforate, conical ; the apex obtuse ; whorls 5-8, 

 the last carinated. 



T. hermia, Hutton (1883). 



Imperforate ; closely plicated above, polished below. Horny brown, 

 paler above than below; columella callous, white. Diameter *7 inch. 



North Island. — Manawatu. 



The animal and dentition are unknown, and the generie position is 

 doubtful. 



Genus Vitrina, Draparnaud. 



Shell imperforate, thin, pellucid, shining, depressed ; whorls 2-3, rapidly 

 increasing. Jaw smooth with a median projection. 



V. keemadecensis, Pfeiffer. 



Shell polished, slightly undulated with growth-lines ; spire flat ; whorls 

 3. Pale yellow olive. Diameter "34 inch. 



North Island. — Hobson's Glen, Auckland (T. W. Kirk). 



Found also at the Kermadec Islands. 



The animal and dentition are unknown and the generic position is 

 doubtful. 



Fam. Limacida. 



Animal elongated; mantle small, shield-like, enclosing the shell. No 

 caudal mucous gland. 



Genus Limax, Linne. 



Mantle anterior, the front edge free. Foot with a locomotive disc. 

 Sub-genus Milax, Gray. 



Back keeled to the mantle. 



