MOLLUSCA. 
64.S 
same species. — Alvania novaremis [betteJ novarai], spj FrauSlifeld) h Ct pi 11, 
fig. 16, no locality indicated. — Alvania stlgmdtica (Schwi ti Molitfensti)^ I, c. 
p. 12, fig. 17, Nicobar Islands. 
[i2moa] iSahaneBa Jlammea and incidata [mc*sa], Spp. nn;^ Frauenfeld, Reis. 
Novar. Moll. p. 12, pi. 2. figs. 18 and 19, both from Botany Bay. 
^etia airopurpurba ahd S. nitens, spp. nn.^ Frauenfeld^ 1. t. p. 13, pL 2i figs. 
21 and 22, Botany Bay. [The former allied to the Recorder’s Ilydrohia tas- 
manica, bui much smaller.] 
Skened planorhis (Fabr.) is the only British species, comprising some va- 
rieties of shape and colour ; some other species referred by various authors to 
this genus belong to other genera, and even families. Jeffreys, Brit* Oonch. 
iv. pp. 66, 66. ' 
Hydrobia (Hartm.) is retained as a distinct genus by Jeffieys, on account 
of its foot vranting the opercular appendage or caudal filament, and its habitat 
being in brackish water only. The only British species is uh<B (Penn.)=awa- 
iina (Poiret) = muriatica (Beudant) [the Recorder may add = stagnaUs (Linne) ]; 
varieties MQ — harleei (Jeffr.), octona (L.) [?], and haltica (Nilss.). Brit. 
Conch, iv. pp. 51-64. — The same species is described as Paludinella stagnalis 
from Hakodate and Japan by Schrenck, 1. c. p. 312. 
Hydrobia moitessieri, sp. n., Bourguignat, Moll. Nouv. fasc. vi. 1866, p. 191, 
pi. 31. figs. 8-11, and Rev. et Mag. Zool. p. 90, pi. 21* figs. 10-16. Allied to 
H. gibba (Drap.), which is figured for comparison on the same plate, figs. 1-7, 
both from Montpellier, Southern France. The other localities of H. gibba^ 
given by various authors, are rather uncertain, other species having been pro- 
bably confounded with it. — H. reboudi, sp. n., Bourguignat, 1. c. vii. 1866,p. 218, 
pi. 33. figs. 19-21, Algeria. — Hydrobia carinulata, sp. n., Drouet, Moll. Gdte 
d’Or, p. 90, springs in the limestone of the French department Cote d’Or* 
\_Hydrobic^ Bythinia baudoniana^ sp. n., Gassies, Malacol. Aquit. /. c. p. 23, 
fig. 7* In shape similar to R. leachii (Sheppard), but the whorls more dis-, 
tinct, the umbilicus larger, the operculum with a complete spire, red. In 
ditches of brackish marshes at Teich, intralittoral region to the left of 
the Garonne, together with Limn< 2 a glabra and Planorbis leucostoma, var. 
perezii (Graells). 
Hydrobia. Paladilhe, Rev. Zool. pp* 46-47, 88-96, describes the following 
species : — H. eutropha, sp. n., pi. 20. figs. 7-9, and H. mabilleana, sp. n., pi. 20. 
figs. 19-21, from the alluvium of the river Lez, Southern France j H. liguricaj 
sp. n., pi. 21. figs. 20-22, Finale ; H, etrusca, sp. n., pi. 21. figS. 14-16, Mont- 
morella near Florence ; H. 7iiacei, Sp. n., pi. 21. figs. 17-19, Cannes ; H 
charpyi, sp. n., pi. 20. figs. 7-9, B^partemeht du Boubs j H Imitanica 
{—Paludina gibba, Morelet, not Drap.), sp. n., pi. 21. figs. 1-4, Coimbra; 
H. gibba (Drap.), pi. 20. figs. 6-9 ; Amnicola cortfma (Frauenfeld), pi. 22. 
figs. 16-17. 
\ 
The North- American freshwater species of Utssoidm [genus 
Hydrobia in its wider sense] are arranged by Binney in the 
following manner : — 
Genus Bythindla (Moq.-Tand.) i aitenuatd (Haldem.), nichlidiana (Lea), 
ienuipes (Coop.), binneyi (Tryon), obtusa (Lea). 
Genus Tryonia (Stimps.) : clathrata (Stimps.), (Gould). 
