96 HELIX-CHAROPA. 



Pitys marquesana Garrett., i. c., p. 18. Nuka-Hiva, Marquesas 

 Is. 



Pitys anceyana Garrett., t. c., p. 19. Dominique, Marquesas Is. 



Section CHAROPA Albers, 1860. 



The type of Charopa being H. coma Gray, it becomes necessary, 

 as Suter has shown, to use that name in a subgeneric sense, for the 

 Australo-Oceanic Patulse, which, although similar enough in general 

 appearance to the smaller species of Patula the world over, still 

 possess a few characters worthy of note. The spire has a tendency 

 to become flattened, or sometimes even concave, quite as in Diplom- 

 phalus ; and the upper termination of the peristome recedes more 

 or less, forming a notch or sinus at the superior angle of the mouth. 

 These characters, although of no very great importance, and vary- 

 ing greatly in degree of development in the different species, may 

 still be held sufficient to justify the separation of Charopa as a sec- 

 tion of Patula, pending the examination of the soft parts of the 

 animal. The separation of Charopa from Pitys and the allied 

 forms with toothed apertures, is at present artificial, and founded 

 wholly upon the presence or absence of teeth or folds within the 

 aperture. 



The figured species have been described by Tryon in vol. Ill, p. 

 22, 23, 24. The following were not included there : 



(1. Species of New Zealand.) 



P. COMA Gray. Vol. IX, PI. 4, figs. 1, 2, 3. 



See vol. Ill, p. 22. 



Var. globosa Suter. Has the general appearance of P. lucetta, 

 but the umbilicus is wider and the ribs more distant. 



Alt. -16 inch. 



Near Hastwell, N. Island, X. Z. 



P. LUCETTA Hutton (Vol. Ill, p. 22). P.'stokesii'E. A. Smith is a 

 synonym according to Mr. Suter. 



P. ETA Pfr. (Ill, p. 24.) Var. maculata Suter. 



Shell agrees in almost every respect with the type of the species, 

 but the white epidermis is adorned with rufous radiate streaks at 

 very irregular distances and from narrow to broad. There are 

 about 50 ribs in the tenth of an inch (20 per mm.) whilst the species, 

 according to Professor Hutton, has only 40 ; but I do not think this 



