778 GASTROPODA. [Pulmonata. 



KEY TO SPECIES. 



A. Shell broadly umbilicated. 



a. Upper surface with faint or obsolete spiral sculpture, some- 

 times wanting. 



b. Whorls 34, rapidly increasing, blackish-olive, no colour- 

 markings . . . . . . . . . . Edward i. 



bb. Whorls 5-6, slowly increasing. 



c. Shell pliable ; chestnut with yellow spiral lines . . fJilliesi. 

 cc. Shell not pliable ; luteous with radial bands of 



darker . . . . . . . . . . lignariu. 



aa. Upper surface finely decussated, the spirals very distinct. 



b. Whorls 4i, rapidly increasing, uniformly deep green . . Busby i. 

 bb. Whorls 5-6, slowly increasing, fulvous to chestnut, with 



darker spiral bands . . . . . . . . Hochstetti'ri. 



B. Shell perforated, rather small ; whorls 3, rapidly increasing, 



with distant spiral striae .. .. .. .. wrnula. 



1. Paryphanta Busbyi, Gray, 1840. Plate 48, fig. 10. 



Helix Busbyi, Gray, A.M.N.H. (1), vi, 317; Dieff. N.Z., 246; Ferussac, 

 Hist. Nat. Moll., pi. 102, f. 19, 20 ; Conch. Icon., vii, pi. 73, f. 380 : 

 Ereb. & Ter., pi. 1, f. 4 ; Conch. Cab. (2), i, pt. 2, 328, pi. 130, f. 1-3. 

 Nanina Busbyi, Gray : Shuttleworth, Notitise, Heft 2, pi. 1, f. 1. Helix 

 (Paryphanta) Busbyi, Gray : Hector, Cat. Land Moll. N.Z., 3. Pary- 

 phanta Busbyi, Gray, Man. Conch. (1), i, 127, pi. 26, f. 23, 24 ; P.L.S. 

 N.S.W. (2), ii, pi. 20, f. 6 (animal) ; M.N.Z.M., 21 ; Hutton, T.N.Z.I., 

 xvi, 207 ; Hedley and Suter, P.L.S. N.S.W. (1), vii, 629; Suter, J. de 

 Conch., xli, 286. 



Shell large, broadly umbilicated, depressed, subdiscoidal, opaque, 

 deep green, shining. Sculpture : Nucleus with, oblique and arcuate 

 radial plaits, the succeeding two whorls distinctly rugose ; on the post- 

 embryonic whorls more or less distinct spiral cords appear, which are 

 first directed upwards, but become spiral on the last whorl ; they are 

 distant, low, broadly rounded, varying in number from about 5 to 10. 

 and absent on the base ; there are retractive distant growth-plications, 

 which are prominently and closely plicate at the suture ; the whole 

 surface of the shell is microscopically decussated by exceedingly fine 

 and dense radiate and spiral lines, the latter slightly wavy. Colour 

 deep green, usually with some radial streaks of blackish-green ; aper- 

 ture within shining-blue. Epidermis thick, glabrous, shining, over- 

 hanging the peristome. Spire flat, very little raised, broadly convex. 

 Protoconch of 2 whorls, flatly convex, the volutions rather rapidly 

 increasing. Whorls 44, rapidly increasing, the last very large, slightly 

 convex, periphery and base rounded, the body-whorl more or less 

 deflexed anteriorly. Suture well impressed. Aperture obliquely 

 lunate-oval. Peristome simple, inflexed throughout. Columella very 

 oblique, slightly arcuate, and shortly reflexed above. Umbilicus 

 broad, perspective, deep. 



Diameter Maj., 66 mm. ; min., 53 mm. : height, 29 mm. (type). 



Embryonic shell globose, flat above, of 2 whorls, narrowed toward 

 the base, narrow I \- umbilicate. Diameter, 10mm. ; height, 9mm. 



