168 Transactions. — Zoology. 



Phrixgnathus maeginatus, Hutton. PL ix., fig. s. 

 Jaw arcuate, riot tapering, papillate, with about 28 broad ribs. 

 Dentition, 35-1-35. Teeth very minute. 



Central tooth unicuspid, longer than broad ; the reflexed portion 

 minute. Laterals bicuspid ; the cusps rather remote, and the reflexed 

 portion small. Marginals apparently the same as the laterals, but too 

 minute to make out clearly. 



Hab. Greymouth (E. Helms). 

 Helix regularis, Pfeiffer. PI. xi., fig. d. 



Jaw arcuate, not tapering, papillate, with about 23 broad rounded 

 ribs. 



Dentition, 27-1-27. Laterals 18 or 20. 



Central tooth rectangular, the length nearly three times the breadth ; 

 the reflexed portion covering only a third of the base, hollowed on each 

 side. Laterals oblique ; the reflexed portion covering a third of the base, 

 bicuspid, the cusps close together ; the inner cusp the larger and carrying 

 the larger cutting point, which is long and pointed. Marginals quadran- 

 gular, broader than long, with several very minute cutting points. 

 Hab. Greymouth (E. Helms). 



The shell is covered with a thin epidermis which is often ciliated round 

 the keel of the last whorl. 



Helix poucilosticta, Pfeiffer. 



Jaiv arched, not tapering, of 21 imbricating plates covered thickly with 

 papillas. 



Dentition, 23-1-23. All the teeth longer than broad and the reflexed 

 portion very short. Central tooth unicuspid ; laterals and marginals 

 rather oblique, bicuspid, with small points. 

 Helix conella, Pfeiffer. 

 Jaw not seen. 



Dentition, 38-1-88. As in the last species. 

 Helix stipulata, Eeeve (= alpha, Pf.). PI. xi., figs. b. and l. 

 Animal like P. coma ; mantle subcentral, slightly reflected over the peri- 

 stome ; eye-peduncles long and cylindrical ; tail short, pointed, and without 

 any mucous gland. Colour pale brown, with a broad slate-blue band on 

 each side of the head, including the peduncles. 



Jaw slightly arched, not tapering, smooth, slightly longitudinally 

 striated ; the anterior edge concave with a jagged margin. 

 Dentition, 12-1-12. Laterals 3 or 4. 



Central tooth rectangular, as broad as long ; the reflexed portion tri- 

 cuspid, the middle cusp reaching two-thirds of the length. Laterals 

 tricuspid, the side-cusps constricted on their outer sides, the middle cusp 



