672 



GASTROPODA. 



[Puhnonata. 



KEY TO SPECIES. 



A. Shell with radial riblets. 



a. Shell openly umbilicated. 



b. Riblets 3 to 4 per millimetre, microscopic spiral 

 lines indistinct ; umbilicus one-fifth of greatest 

 diameter. Dimensions, 6 mm. by 3 mm., with 

 3 whorls 



bb. Riblets about 20 per millimetre, microscopic spiral 

 lines distinct ; umbilicus one-third of greatest 

 diameter. Dimensions, 2f mm. by 1 mm., with 

 4 whorls . . 

 aa. Shell narrowly perforated. 



b. Riblets 25-30 per millimetre, microscopically spirally 

 striate ; spire half the height of aperture. Di- 

 mensions, 3^ mm. by 2 mm., with 3J whorls. . 



bb. Riblets 10 per millimetre, a few spiral grooves on 

 upper surface ; spire three-quarters the height 

 of aperture. Dimensions, 5 mm. by 3 mm., 

 with 3 whorls 

 aaa. Shell imperf orate. 



b. Riblets about 10-12 per millimetre 



bb. Riblets about 25 per millimetre 



B. Shell without radial riblets, growth-striae only. 



a. Shell openly umbilicated. 



b. With microscopic spiral lines, no colour-markings ; 

 suture margined ; umbilicus one-quarter of 

 greatest diameter. Dimensions, 8 mm. by 

 3^ mm., with 4|- whorls 



bb. No spiral lines, with brown zigzag bands ; 

 suture simple ; umbilicus two-fifths of greatest 

 diameter. Dimensions, 7 mm. by 3 mm., with 

 3^ whorls 

 aa. Shell narrowly perforated. 



6. Minutely reticulated ; spire fiat ; last whorl sharply 



keeled 



bb. With growth-lines only ; height of spire three- 

 quarters that of aperture ; periphery convex . . 

 aaa. Shell imperforate, or only very narrowly subperf orated. 

 b. No colour-markings, uniformly horny ; spire very 



low. 



c. Suture false-margined, crenate by growth-striae, 

 with traces of microscopic spiral lines. Di- 

 mensions, 9| mm. by 3J? mm., with 4 whorls 

 cc. Suture simple, no microscopic spirals. Dimen- 

 sions, 6J mm. by 4^ mm., with 3 whorls. . 

 l>li. With brown zigzag markings ; height of spire two- 

 fifths that of aperture. Dimensions, 7 mm. by 

 34 mm., with 31 whorls 



Chiron. 



Pilsbryi. 



costtilata. 



olivacea. 



Feredayi. 

 glacialis. 



crebriftammis. 



Jacquenetta. 

 Perditu. 



com pressi valuta . 

 cornea. 



phlogophora. 



1. Flammulina alpina, Suter, 1904. Plate 26, fig. 12, a, 6. 



Flammulina alpina, Sut., " Index Faunae Novpe-Zealandise," 62. Amphidoxa 

 corneo-fulva, Pfr. : Suter, T.N.Z.I., xxiv, 1891 (1892), 287, pi. 20, f. 5, 6. 

 Flammulina corneo-fulva, Pfr. : Hedley and Suter, P.L.S. N.S.W. (2), 

 vii, 644 ; Suter, J. de Conch., xli, 240 ; not of Pfeiffer. 



Shell small, suborbicular, umbilicated. smooth, shining, pellucid. 

 Sculpture consisting of oblique curved and retractive growth -stria?, 

 more prominent toward the suture, and minute dense microscopic fine 



