632 GASTROPODA. [PnlmonuUi. 



Diameter Maj., 9-5 mm. ; min., 9 mm. : height, 5-5 mm. (type). 



Dentition. Hutton, T.N.Z.I.. xvi. 169, pi. 10. f. E ; Man. Conch. 

 (2), ix, pi. 3, f. 27. 



Jaw arcuate, flatly plaited, the concave margin indented. 



Radula having the formula 35 + 1 + 35, varying from 27 to 40. 

 Laterals about 9, varying from 8 to 10. Central tooth rectangular, 

 the reflexed portion half the length of the base, slightly constricted, 

 and with a moderate point. The inner laterals like the central tooth, 

 but broader and with the outer lobe more marked and notched, the 

 notch getting gradually less outwards. Inner marginals with a long 

 base and a short reflexed portion bearing a long oblique cutting-point 

 on the inner edge and a small cusp on the outer ; outer marginals 

 irregular, the breadth and length about equal, with a long oblique 

 cutting-point. The laterals pass gradually into the marginals, and 

 the cutting-point is longest in the middle of the marginals. (Hutton.) 



Type in the British Museum. 



Hob. North Island : Near Auckland (Major Greenwood) ; Gn-in 

 Barrier Island (Osborne) ; Waiheke Island (H. S.) ; Howick ; Maketu 

 (Major Broun) ; Tuakau (S. Bull) ; Msnmlcu (T. F. Cheeseman) : 

 Wairangi (A. Suter) ; Mount Pirongia (T. Urquhart) : Raglan (R. 

 Murdoch) ; Ngaputahi. Tuhoe-land (A. Hamilton) : Mangaoin 1 Cave, 

 near Nuhaka (Howard Hill) ; near Wellington (H. 8.). South Island : 

 Nelson (H. B. Preston) ; Kenepuru (McMahon) : Greymouth (R. 

 Helms). Chatham Islands. 



5. Thalassohelix ziczag, Gould, IS4X [Mate 25, tigs. 7, la. Ib. 



Helix zi'-mj. Gould, P. Bost, S.N.H., ii. 10<i : U.S. Kxj.l. Kxp., xii. 41. 

 f. 44, a-c; M.H. Viv., i, 11 ; Cox, .Mono-r. Aust. Land Shells, IS, pi. l!>. 

 f. 11, lla; Man. Conch. (2), ii, 210. viii. f,0. /'ntx/a (Discus) -.iczag, 

 Gld., Nomencl. Hel. Viv., 91 ; M.N.Z.M.. 7. Tli<tlfi*<>lidix ziczag, 

 Old. : Hedley and Suter, P.L.S. N.S.W. (2), vii, 035 ; Suter. I.e. (2), 

 viii, 488 ; " Nautilus," vii, 123 ; J. de Conch., xli. 256. Helix Portia, 

 Gray, P.Z.S., 1849 (1850), 105; A.M.N.H. (2), vii. 05; M.H. Viv.. 

 iii, 154 ; Conch. Icon., vii, f. 800 ; Conch. Cab. (2), i, pt. 2, 213, pi. 154. 

 f. 15-18; Man. Conch. (2), ii, 213, pi. 02, f. 35-37. Patula (Cliaropu) 

 Portia, Gray, Nomencl. Hel. Viv., !'s. //<//.( l >inn>i>(i) Portia, Gray : 

 Hector, Cat. Land Toll. N.Z.. Is. I'alidi 1',,,-tt',,, Cray, M.N.Z.M., 

 10. Thalassia Portia, Gray: Hutton, T.N.Z.I.. xvi, 2o.i Helix col- 

 l.i/rl. Reeve, Conch. Icon., f. Sll. //. kapjin. Pfeiffer. P.Z.S.. 1852 

 (1854), 58; M.H. Viv., iii, 154; Conch. Cab. (2), i, pt. 2. pi. 154, f. 25, 

 20. //.* (Chnropa) ka,>ii, Pf r. : Hector, Cat. Land Moll. N.Z., 18. 

 Pai/ilu (C/ii/mitft) kfipjifi, Pfr.. Xomencl. Hel. Viv.. !)S. /'. katnia, Pt'r., 

 M.N.Z.M., 7. 



Shell depressed, umbilicated, thin. ril-'i.Hl. and hairy, periphery 

 < onvex. Sculpture consisting of obliquely retractive, arcuate, equi- 

 distant, fine and sharp axial riblets. about 6 per millimetre, with 

 -parse rigid hairs, which easily get rubbed oft"; there is no spiral 

 sculpture. Colour fulvous, with rufous streaks and spots, the former 

 forming zigzag lines on the last whorl, obsolete on the base. Epidermic 



