281 
ZOOLOGICAL LITERATURE. 
Besides some historieal remarks^ a systematic list of forty- 
eight species hitherto known is given ; they are referred to four 
genera j none of the genera and species are characterized. 
Diplommatina nana, sp. n., Blanford, Journ. As. Soc. Bengal, 1866, p. 86, 
Pegu. 
Plectostoma, g. n., H. Adams. Last whorl bent upwards and backwards j 
aperture without teeth. P. de cresjngnii, sp, n., H. Adams, Ann. & Mag. Nat. 
Hist. XV. p. 177, Labuan. This genus has been recognized by Mr. PI. Adams 
himself to be identical with Opisthostoma (Blanford, 1861), Proc. Zool. Soc. 
1866, p. 766 j but its position is not yet ascertained, the operculum being 
unknown. Blanford places it between Alycceus and Diplommatina, Adams 
among the IlelicidcB near Boysia and Ilypselostoma, Pfeifter among the Cy- 
clotea behind Alycceus, and Semper among the Diplommatinacea. 
Cyclostomid^ (?) . 
Pomatias (Stud.). Only eleven species are described and figured in Sower- 
by’s monograph, forming part of the ^ P’hesaurus,’ pp. 265-267, pi. 269, whilst 
in the same year (1864) Crosse enumerated twenty species in the French 
Journal of Conchology, and Pfeiffer fifteen some years ago in the first sup- 
plement of his monograph of the Pneumopoma ; three others Avere added 
iu 1864, see Zool. Record, i. p. 239. P. Jdmalayce (Bens.) is figured, figs. 19 
& 20 . 
New species : — 
Itealia ochrostoma, variahilis, scalariformis, affinis, and Icevis, Pease, Am. 
Journ. Conch, i. pp. 287-289, Polynesia. 
.[Realia'] Hydrocena parvula, Mousson, Journ. Conch, xiii. p. 184, Upolu, 
Samoa Islands. 
[PeaZ/tt?] Hydrocena marginata, Morelet, Journ. Conch, xiii. p. 226, Siam. 
Omphalotropis zehriolata (pi. 14. fig. 11), j^&rforata (fig. 12), conoidea, hiji- 
laris hilirata (fig. 13), Mousson, 1. c. pp. 181-184, Samoa Islands ; Omph. 
ovata (fig. 10) and parva, Mousson, I c. pp. 198 & 199, Feejee Islands. 
[^Omphalotropis Hydrocena turhinata, Morelet, 1. c. p. 226, Cochinchina. 
Assimine^. 
\^Assiminea'] Hydrocena inaularis, sp. n., Crosse, Journ. Conch, xiii. p. 223, 
pi. 6. fig. 7, Gambier Islands. 
Assiminea suhrotundata, sp. n.. Carpenter, Ann. & Mag. Nat. Hist. xv. 
p. 28, Neeah Bay, Vancouver district. May prove to be a large Hydrobia.” 
Paludinella castanea, sp. n., Carpentei’, /. c., Neeah bay, Vancouver district. 
May be an aberrant Assiminea.^’ 
[^Assiminea'] Paludinella helicoides, sp. n., Gundlach. Umbilicated, diam. 1^, 
alt. 1 millim., whitish, somewhat glossy, four rounded Avhorls. Report, fisico- 
nat. de Cuba, i. 
TuUNCATELLIDiE. 
Truncatella rustica, sp. n., Mousson, Journ. Conch, xiii. p. 186, pi. 14. fig. 8, 
Uvea Island, Samoa group. 
