HELIX-CARTH^A. 77 



peristome thin, the right margin joined closely to the next whorl. 

 Greatest diameter '23, least *2, height '18 inch. 



The shell differs from H. chiron in being higher, the umbilicus 

 narrower, and the right margin of the peristome not advancing. 

 From If. novarce it differs in being striated, in the suture being 

 impressed and the spire convex. From A. cornea it differs in being 

 umbilicated. 



Animal with the mantle central, slightly reflected over the per- 

 istome of the shell ; tail pointed, depressed, with a mucus gland. 

 Color dark slate-gray, the mantle marbled with black and white ; 

 sole of the foot dirty yellowish. (Hutt.*) 



Auckland, Wanganui and Wellington, North Island ; Greymouth, 

 South Island, New Zealand. 



Amphidoxa perdita HUTTON, Trans. N. Z. Inst. xvi, p. 179, t. 11, 

 f. C and Q (dentition and jaw). 



G. CHIRON Gray. (Vol. I, p. 129.) 



The specimens from Ohaupo, collected by Mr. Chas. T. Moussou, 

 and of which I give figures (pi. 22, figs. 76, 77, 78), are so strongly 

 plaited that I first took them for a new species, closely allied to A. 

 chiron ; but the dentition is decidedly that of the species mentioned, 

 as described and figured by Professor F. W. Hutton in Trans. N. 

 Z. Inst., vol. XVI. This species seems to vary very much with 

 regard to the plaits. Specimens I collected in the Forty-mile Bush 

 show almost no trace of plaits, but only well developed growth lines. 

 The shells from Ohaupo correspond with Gray's description, though 

 I should not call them plaited, but ribbed. A. chiron may be con- 

 sidered as an intermediate form between Amphidoxa s. str. and the 

 subgenus Calymna Hutton, which includes the forms with ribbed 

 whorls. (Sitter.) 



G. CREBRIFLAMMIS Pfr. (Vol. I, p. 130). 



CARTH^A (vol. Ill, p. 37). 

 The position of this group is uncertain. 



H. FLOSCULUS Cox. PI. 22, figs. 79, 80, 81. 



Shell depressed-trochiform, imperforate, thin but solid, carinated 

 at the periphery. Color variable ; either (1) alternately streaked 

 with brown or corneous and cream-white, or (2) chestnut-brown 

 above and below, having a creamy peripheral line and columellar 



