96 AURICULELLA, OAHU. 



570. Helicteres petitiana PEASE, Journ. de Conehyl., 1868, p. 

 343. Auriculella petitiana PFR., Mon. Hel. Viv., viii, p. 210. 

 ANCEY, Bull. Soc. Malac. France, vi, 1889, p. 227. SYKES, 

 Fauna Hawaiiensis, ii, Moll., p. 377. Not A. petitiana 

 BORCHERDING, Zoologica, part 48, p. 146, pi. 9, figs. 24, 24& 

 (Kealia, Molokai) =a sinistral form of A. cerea. 



The specimen in the British Museum under this name be- 

 longs to a different species, and no doubt is somewhat related 

 to A. cerea Pfr. From an examination of Krister's figure and 

 a comparison of the descriptions, A. petitiana seems to be very 

 closely related to A. castanea Pfr. Pfeiffer, in a note on the 

 latter species, compares the two. I have specimens that un- 

 doubtedly belong to A. castanea which are corneous in tint. 



Pfeiffer does not state that his shell was umbilicate, and it 

 may be inferred that it was imperforate. All the Tornatel- 

 linas known to him at that time were imperf orate (cf. Mono- 

 graphia I, 1848, p. xxv). Kuester's figure, reproduced in pi. 

 28, fig. 8, gives the impression of an imperforate shell. 

 Kuester says of the type specimen that there is a ' e weak whit- 

 ish callous in the throat " and that "the columella ascends 

 almost vertically, with a tooth-like prominent fold; the peri- 

 stome straight, sharp". It was apparently not quite mature, 

 though from the number of whorls (8) it must have been 

 nearly so. 



By the numerous, closely coiled whorls, the size and color, 

 Pfeiffer's shell agrees with A. serrula- but that species has a 

 strongly plicate and lamellate columella, and when not quite 

 mature there is a lower-palatal plica, but no callus in the 

 throat. 



A. tantalus has part of the characters of petitiana, but it is 

 distinctly perforate, and there are not whorls enough. 



There is an imperforate species found on Mt. Tantalus, 

 sometimes associated with A. tantalus, which it resembles in 

 size, shape and often in color. It varies in one colony from 

 chestnut-brown, through cinnamon of various shades and tints 

 to naphthalene yellow with a cinnamon summit. There is a 

 lower-palatal lamina in the neanic stage up to a length of 

 about 4.4 mm., and the columellar lamella is very prominent 



