Endodont-a. 1 



GASTROPODA. 



701 



KEY TO SPKCIES. 



A. Interstices between the riblets with microscopic spiral line,-*, 



often rather indistinct. 



a. Riblets about 2 per millimetre, their number, however, 



somewhat variable ; spirals distinct ; ">.', whorls ; di- 

 mensions. 7 mm. by 3 mm. . . . . . . coma. 



b. Riblets 910 per millimetre ; spirals mostly indistinct : 



umbilicus one-third of diameter : 4 whorls ; dimen- 

 sions, 3f mm. by If mm. . . . . . . 



c. Riblets 11-13 per millimetre; spirals very indistinct; 5 



whorls ; dimensions, 3f mm. by If mm. . . . . montivaga. 



'!. Riblets 15 per millimetre ; spirals indistinct ; umbilicus 

 one-quarter of diameter ; 4 whorls ; dimensions, 3| mm. 

 by H mm. . . . . . . . . . . ochru. 



>'. Riblets 20 per millimetre ; spirals indistinct ; umbilicus 

 one- quarter of diameter ; 3| whorls ; dimensions, 

 2 mm. by 0-8 mm. . . . . . . . . chrysaugcin. 



f. Riblets 30 per millimetre ; spirals distinct ; umbilicus one- 

 third of diameter ; 5 whorls ; dimensions, 2-6 mm. by 

 1-4 mm. . . . . . . . . . . Benhami. 



B. Interstices without microscopic spiral lines. 



a. Riblets 5-8 ; umbilicus two-fifths of diameter ; f> whorls ; 



dimensions, 5^ mm. by 2 mm. . . . . . . pseudocoma. 



<iu. Riblets 11-15 per millimetre. 



b. Riblets 11 per millimetre; umbilicus nearly one-half 

 of diameter ; 5| whorls ; dimensions, 4-3 mm. by 

 2-2 mm. . . . . . . . . . . multicostata. 



bb. Riblets 13-15 per millimetre ; umbilicus one-third 

 of diameter ; 4i whorls : dimensions, 2-3 mm. by 

 1mm. .. .. .. .. .. <nt.</niriilux 



bbb. Riblets 15 per millimetre ; umbilicus one-third of 



diameter ; 4 whorls ; dimensions, 2J mm. by 1 j mm. montana. 

 uaa. Riblets 18-20 per millimetre ; umbilicus one-quarter of 



diameter : 4 whorls ; dimensions, 2^ mm. by 1 mm. . . Bianco,. 



1. Endodonta anguiculus, Reeve, 1852. Plate 27, fig. 16, , l>. 



Helix anguiculus, Rve., Conch. Icon., vii, pi. 131, f. 802 ; M.H. Viv., lii, 

 634; Hector, Cat. Land Moll. N.Z., 14. Patula (Oharopa) anguiculus, 

 Rve., Nomenel. Hel. Viv., 98. P. aw/'/i'-, lus, Rve. : Hutton, M.N.Z.M.,9 ; 

 T.N.Z.I., xvi, 192. Helix (Patula) anguiculus, Rve. : Tryon, Man. Conch. 

 (2), iii, 23, pi. 3, f. 13. Charopa ai/i/idc/ihis, Rve: Hedley and Suter, 

 P.L.S. N.S.VV. (2), vii, 655. Endodonta (Charopa) ani/uictili.'*, Rve. : 

 Suter, J. de Conch., xli, 2(i3. Helix theta, Pfeiffer, ined. 



Shell minute, subdiscoidal, umbilicated, closely radiately ribbed, 

 dark brown with subequidistant white streaks, thin, not shining. 

 Sculpture of the post-nuclear whorls consisting of fine and close slightly 

 retractive radial riblets, sinuous on periphery and base, 13 to 15 per 

 millimetre ; interstices with a few growth-hues, but no spirals. Colour 

 rufous, with fairly regularly spaced white radial streaks, some of 

 which extend to the base. Satire flat or slightly elevated. Protoconch 

 of If whorls, smooth, convex. Whorls 4J to 5, convex, slowly and 

 regularly increasing, periphery and base rounded, sometimes the last 

 is very slightly descending in front. Suture impressed. Aperture 

 oblique, rotundly lunate. Peristome thin and sharp ; margins con- 



