700 GASTROPODA. 



Diameter Maj., 4-3 rum. ; min., 4 inni. : height, 3 mm. (type). 



Animal Hutton, T. N.Z.I., xvi, 168. 



Dentition (Hutton, T.N.Z.I., xvi, 168, pi. 11, f. B, L. ; Suter, 

 I.e., xxiv, 29G, pi. 22, f. 34, 35). Formula of radula varying from 

 12+1+12 to 16 + 1 + 16. Jaw and teeth very similar to those of 

 the foregoing species. 



Hob. North Island : Thames (Adams) ; Petaiie, near Napier 

 (fide Hutton). South Island : Greymouth (Helms) ; Temuka (Pro- 

 fessor Chilton) ; Dunedin and Queenstown (Captain Hutton) ; 

 Owaka, Clutha (Bryant) ; Taieri (E. Suter) ; The Nuggets (A. 

 Hamilton) ; Fortrose (Miss Rich). 



Remarks. The North Island habitat wants confirmation. I think 

 the species is precinctive to the South Island. 



Subgen. 5. CHAKOPA. Albers, 1860. 



Clnirnpa, Albers, "Die Heliceen," <!. 2, 87. Type: Helix coma, Gray. 

 Charopa, Pilsbry, Man. Conch. (2), viii, 9<i, ix, 31. Simplicaria, Mousson, 

 MS. : Suter, T.N.Z.I., xxiii, 90. 



Animal small, the mantle rather posterior, tail not or not much 

 produced behind the shell. Eye-peduncles large, club-shaped, approxi- 

 mated at their bases ; tentacles short. Foot margined by a para- 

 podial groove. 



Jaw delicate, thin, more or less arcuate, subvertically striate. 



Radula having the central tooth tricuspid, side cusps small. Late- 

 rals similar, the entocone becoming larger outwardly until it becomes 

 joined 'at the base with the mesocone. Marginals low and wide, tri- 

 cuspid. 



Reproductive organs simple. 



Shell depressed, subdiscoidal, the spire varying from convex to 

 concave ; openly umbilicated ; whorls rather cylindrical, the last 

 rounded or subangular (never keeled) at the periphery ; surface sculp- 

 tured with oblique or sigmoid rib-stria? ; unicoloured or painted with 

 radiating reddish flames ; aperture lunate, oblique, the lip thin and 

 simple, more or less sinuous ; parietal wall covered by a varnish of 

 callus, the riblets being removed by absorption. 



The species are numerous, and they occupy a vast territory ; 

 New Zealand, Polynesia, and New Caledonia are their especial home. 

 In my opinion, only very few of the Tasmanian and Australian species 

 to Charopa really belong to it. Recently discovered in Natal. 



1. Gi'oiij) of Endodonta r<uua.. 



Shell having a smooth protoconch. Riblets more or less arcuate, 

 retractive; interstices without or with "microscopic spiral lines, often 

 indistinct ; umbilicus wide. 



