712 



GASTROPODA. 



[Pulmo/tata. 



KEY TO SPECIES. 



A. Interstices between the riblets with very distinct microscopic 



spiral stria?. 



a. Riblets 8 to 10 per millimetre. 



1. Riblets 8 per millimetre ; umbilicus one-third of dia- 

 meter ; 5 whorls ; dimensions, 3 mm. by H mm. 



'2. Riblets 8-10 per millimetre ; umbilicus one-quarter 

 of diameter ; 5 whorls ; dimensions, 4 mm. by 

 2 mm. 



3. Riblets 10 per millimetre ; umbilicus one-third of 



diameter ; whorls 5 ; dimensions, 3 mm. by 

 1-3 mm. 



4. Riblets 1012 per millimetre ; umbilicus wide, 



gradate ; whorls 4 ; dimensions, 2-8 mm. by 

 1-3 mm. 



b. Riblets 15 per millimetre ; umbilicus one-third of dia- 



meter ; whorls ;3 ; dimensions, 2-7 mm. by If mm. . . 



c. Riblets 20-24, but sometimes less, the spirals passing over 



them ; umbilicus one-quarter of diameter ; whorls 5 ; 

 dimensions, 3-8 mm. by 2 mm. to 4| mm. by 2^ mm. 



d. Riblets 28-30 per millimetre. 



1. Riblets 28-30 per millimetre ; sutural sinus not 



prominent ; whorls 4 ; dimensions, 2 mm. by 

 f mm. 



2. Riblets 30 per millimetre ; sutural sinus well pro- 



nounced ; whorls 4^ ; dimensions, 2J mm. by 

 1 mm. 



B. Interstices between the riblets without or with indistinct 



microscopic spiral striae. 



a. Interstices without spirals ; riblets 8 per millimetre, every 

 3rd to 5th higher than the others ; 5 whorls ; dimen- 

 sions, 4J mm. by 2f mm. 



aa. Interstices with indistinct or obsolete spiral stria.-. 

 b. Riblets 6 to 10 per millimetre. 



1. Riblets 6-8 per millimetre ; whorls 5 ; dimen- 



sions, 3 mm. by 1 mm. . . 



2. Riblets 810 per millimetre ; whorls 4J ; dimen- 



sions, 3 mm. by Ij mm. 



3. Riblets 10 per millimetre. 



c. Umbilicus one-third of diameter ; whorls 5 ; 



dimensions, 4-2 mm. by 2J mm. 

 cc. Umbilicus less than one-third of diamett- r ; 

 last whorl widened on approaching aper- 

 ture ; whorls oi ; dimensions, 3-7 mm. 

 by 1 mm. 

 bh. Riblets 1 1 per millimetre : whorls 5 ; dimensions, 



6 mm. by 2| mm. . . 

 t>l>h. Riblets 12-15 per millimetre. 



1. Riblets 12-13 per millimetre, irregularly de- 

 veloped ; spirals more or less distinct ; 

 whorls 5 ; dimensions, 3 mm. by 1 mm. . . 

 '1. Hiblets 15 per millimetre. 



c. Riblets equally developed ; whorls 5 ; di- 

 mensions, 2^ mm. by 1^ mm. 

 cc. Riblets alternately one higher than the 

 next ; whorls 3| ; dimensions, 1-8 mm. 

 by 1 mm. . . 



subinfecta. 

 Roseveari. 

 buccindla. 



caput-spinulcB. 

 reeftonensis. 



Sterkianti. 



eremita. 

 Brouni. 



tapirina. 



mutabilis. 

 alpestris. 



Colensoi. 



infecta. 

 otagoensis. 



irregularis. 



serpentinulr 



variecostata. 



