98 HELIX-CHAROPA. 



thin, upper margin rapidly advancing and then turning down with 

 a slightly concave sinuation, then regularly arched ; columellar 

 margin not reflected. Greatest diameter 0'19, least O16, height 

 0'07 inch. Dentition 13-1-13. (Button.) 



Having compared this species with specimens of the true P. coma 

 from Auckland, I find that it is different, being more closely ribbed, 

 but less closely so than in P. buccinella and P. infecta. The right 

 lip advances as in P. infecta, but it can be distinguished from that 

 species by the interstices between the ribs appearing almost smooth 

 when viewed by transmitted light, and an inch objective. (Hutton.) 



North Island of New Zealand at Auckland, Hastwell, Havjke's 

 Say, Master ton and Wellington; South Island at Greymouth, Temuka, 

 Dunedin and Queenstown. 



Patula coma HUTT., Tr. K Z. I., xiv, p. 130, t. 3, f. L, not of 

 Gray. Patula tapirina HUTT., ibid, xv, p. 134, and xvi, p. 193. 

 P. tapirina f. albina SUTER, ibid, xxiv, p. 273. 



P. SYLVIA Hutton. 



Shell minute, discoidal, umbilicated, obliquely ribbed ; colors very 

 pale horny with faint thin radiating bands of chestnut on the upper 

 surface. Spire flat or slightly convex ; whorls 5, very slowly 

 increasing, rounded, with delicate rather distant ribs which are very 

 oblique on the upper surface but transverse to the whorls on the 

 lower surface, ribs about 18 in the tenth of an inch, the interstices 

 rather strongly striated with growth lines ; suture impressed ; umbili- 

 cus rather wide, graduated; aperture slightly oblique, rotundly 

 lunar ; peristome thin, regularly arched, the upper margin advanc- 

 ing. 



Greatest diameter *12 ; least '1 ; height '06 inch. (Hutton.) 

 Auckland, Horokiwi, Forty-mile Bush, and Wellington, North I., 

 Bealey, 8. IsL, New Zealand. 



P. sylvia HUTTON, Trans. N. Z. Inst. xvi, p. 175, 193. SUTER, 

 Ibid, xxiv, p. 273,278; 1891. 



Mr. Suter (in lit.) informs me that this is identical with P. tau 

 Pfr. 



P. ZETA Pfr. (Ill, p. 23.) 



Var. IRREGULARIS Suter. PI. 19, figs. 13, 14, 15. 



Shell depressed, subdiscoidal, yellowish-white, with distant light 

 brown streaks vanishing on the base, slightly shining, rather thin, 



