248 FAUNA OF NEW ZEALAND. 



150. Onchidium nigricans. Quoy et Gaim. Voy. Astrol. 

 ii. 214, t. 15, f. 24-26. 



Inhab. New Zealand, " Anse de FAstrolabe. 5 ' 



Fam. AMPHIBOLID^E. 



151. Amphibola avellana. Helix avellana. Gmel. 3640. 

 Wood, Cat. f. 46. Chemn. v. f. 19 19-20. Ampul- 

 laria avellana. Lam. vi. Ampullacera avellana. 

 Quoy et Gaim. Voy. Astrol. ii. 176, t. 15, f. 1-8. 



Inhab. New Zealand. Sunk in the sand. 



Eaten by the natives. Quoy, ii., 199. 



They live on mud-flats where mangroves grow, and in such-like 

 places. One specimen had the whorls nearly on a plane, and the 

 ridges very much raised. 



Fam. SIPHONARIAD^E. 



152. Siphonaria australis. Quoy et Gaim. Voy. Astrol. 

 ii. 329, t. 25, f. 32-34. 



Inhab. New Zealand, Cook's Straits. 



1 53. Siphonaria Zelandica. Quoy et Gaim. Voy. Astrol. 

 ii. 344, t. 25, f. 17, 18. 



Tnhab. New Zealand. Quoy. 



154. Siphonaria scutellum. Desk. Mag. Zool., 1841, 

 t. 35. 



Inhab. Chatham Island. M. Desk. 



Fam. LYMNEAD.E, 



155. Physa variabilis. Gray. 



Inhab. rivers with Amnicola antipodarum. 



Shell ovate, spire conical, apex often eroded, whorls ventri- 

 cose, swollen, and often flattened and keeled behind. The young 

 shells have an acute spire. 



These shells vary so much in appearance, that if I had not re- 

 ceived them all in one parcel, as if from the same locality, I should 

 be inclined to have regarded them as different species. They vary 

 not only in size from f to i of an inch, with the same number of 

 whorls, but also in the hinder part of the last whorl being rounded 

 and in others flattened and edged with a distinct keel; in the 

 height of the spire, which is generally about two-thirds the length 

 of the mouth, and in others scarcely raised half that height ; and, 

 lastly, some, instead of being short and swollen, as is their general 

 character, are elongated and tapering. 



