FAUNA HAWAIIENSIS 
to 
Co 
te) 
(1) Microcystis chamissoi Pfeiffer. 
Flelix chamessot Pfeiffer, P. Zool. Soc. London, 1855, p. 91; Bland and Binney, 
Ann. Lyc. New York, x. p. 338, pl. xv. fig. 3 (jaw and radula; copied 
in Ann. New York Ac. m1. pl. xvi. fig. O). 
Has. Kauai, Waioli and Haena (Baldwin); Makawele and Mountains above 
Waimea (Perkins). 
Bland and Binney give ‘“ W. Maui” on the authority of Newcomb, but this 
seems very dubious; Mons. Ancey gives Oahu, but I think this must be an error. The 
figures in the Manual of Conchology (Vol. u. pl. xxxvu. figs. 74—6) are not good. 
PHILONESIA, gen. nov. 
Recently’, I discussed the genus J/zcrvocys¢7s Beck, and expressed the opinion that 
these small Zonitoid forms so characteristic of the Hawaiian Islands, and scattered over 
the Islands of the Central Pacific, could not be placed in that genus. I, further, 
referred them to Macrochlamys, stating that “whether our small forms are in accord 
with the typical group of this genus anatomically, remains to be proved; but, concho- 
logically, they only appear to differ in size.” 
Specimens of a form which IJ refer to the unfigured Wecrocystis baldwint Ancey, 
and which were collected by Mr Perkins, contained the animal, and Lt.-Col. Godwin- 
Austen has most kindly made an examination of it. His full report will be found on 
p. 281, but I may here summarize it by saying that this species does not belong to 
Macrochlamys at all, and the query I suggested has been answered. He points out its 
affinity to Sztada and Kadlzel/a and here it is interesting to note that Mr Perkins found 
a species in the Hawaiian Islands that I have referred to the latter genus. 
Under these circumstances, and as the shells are distinct by the conchological 
characters of the columella from both JZzcrocystena and Lamprocystts—anatomically, 
also, from the former—I have ventured to create a new genus and propose to take 
Microcystis baldwint Ancey, as the type. Probably the bulk of the Hawaiian Zonitoid 
forms belong to this group. 
(1) Philonesia aberlled Ancey. 
Microcystis abertlet Ancey, Bull. Soc. Malac. France, vi. (1889), p. 199. 
Haz. Molokai (Ancey); Mapulehu (Baldwin); wet forest above Pelekunu 
(Perkins).—Oahu, Waianae Mts. (Perkins).—Lanai (Perkins). 
All the specimens are young, but I cannot sever them from this species. 
* P. Malac. Soc. London, 1. p. 130. 
