136 
MOLLUSC A. 
Hydrohia tdvce (Pennant), from Kiel. lid. ibid. pp. 36-89, pi. 6. figs. 
6 - 12 . 
Hydrohia canariensis, sp. n., Mousson, Malacol. Can. p. 148, allied to ven~ 
trosa (Montagu), Fuerteventura, Canarian Islands. 
Paludcstrina bcccariif sp. n., Paladillie, in Issel’s paper, Atti Soc. Ital. xv. 
1 (p. 16), Stagno d’Orfietello, a lake of brackisli water on the coast of 
Tuscany. 
Hemistomia, g. n., resembling Hydrobia and JRissoa. Peristome simple, 
continuous, nearly free j pillar-lip thickened, oblique ; operculum not known. 
H. caledonica, sp. n., Crosse, J. de Conch, xx. pp. 72 & 852, pi. 16. fig. 8, 
Noumea, New Caledonia. Not known whether from fiesh or salt water. 
Paludinidas. 
Paludina madagascariensisj sp. n., Crosse & Fischer, J. de Conch, xx. p. 210, 
Madagascar. 
Vivipara Jischeriana and eriesi (Morelet) figured by Mabille, R. Z. (2) xxiii. 
p. 60, pi. 5. figs. 1 & 2 and 3-5, both from Cambodia. 
Bithynia inconspicua (Pohrn), lutea (Gray) (Hutt.) 
(Kiister, nec Bens.), nassa (Theob.), iravadica (Blank), cerameopoma (Bens.), 
travancorica (Bens.), pidchella (Bens.),, stenothyroides (Dolirn), and orcula 
(Bens.). Hanley & Theobald, Couchologia Indica, pi. 37. figs. 6-10, and pi, 
88. figs. 1-9, British India. 
Stenothyra minima (Sow.), deltcBf foveolata, and monilifera (Bens.). lid. 
ibid. figs. 1-4, British India. 
Valvatid^e. 
Valvata. The odd thread in the branchial cavity is perhaps, morphologi- 
cally, the rudiment of a second gill, but makes its first appearance in the 
same form as in the full-grown animal. Ganin, Z. wiss. Zool. xxii. p. 285. 
Valvata? petiti, sp. n., Crosse, J. de Conch, xx. pp. 167 & 363, pi. 16. 
fig. 7, New Caledonia. 
AMPULLARIIDAi. 
Ampidlaria crosseana (Hidalgo, 1871), Hidalgo, J, de Conch, xx. p. 142, 
pi. 7. fig. 1, B. Amazon. 
TuiUlITELLIDiE. 
Turritella alba, sp. n., II. Adams, P. Z. S. 1872, p, 9, pi. 3. fig. 3, Red Sea 
(“ apparently a young shell”). 
Mesalia polaris (Beck) =erosa (Couthouy), M. reticulata (Moller) = 
(Carpenter), and M. acietda tenuisculpta (Carpenter), all from the 
North Pacific, the first two from Plover Bay, East Siberia. Operculum uni- 
form. Dali, Am. J. Conch, vii. pp. 1I8& 119. 
CiECIDiE. 
C<ecum vitiense and costidatum, spp. nn., Garrett, P. Z. S. 1872, p. 879, Viti 
Islands. 
VERMETIDiE. 
The genera of this family, adopted by Morch (P. Z. S. 1861 & 1862) are thus 
arranged by L. Vaillant, N. Arch. Mus. vii. pp. 181-200 : — 
