R1ssOIDsA. AY 
var. obeliscus. 
Assiminea obeliscus, Paladilhe, Rev. Mag. Zool. 1860, long. 5, diam. 8 mil., 
River Macte ; emend. Palad., 1874, long. 7, diam. 34 mil., as Peringia 
obeliscus. 
14 “ Marées de la Macte,” Oran; coll. P. Joly, Esq. (as “ Peringia obe- 
liscus, Pal.”’). 
var. pictonum. 
Peringia pictonum, Paladilhe, Ann. Sci. Nat. I, 1874, Charente Inf: 
and Vendée—long. 6 to 7, diam, 3: mil. 
20 Lake Ossigor [S. W. France] ; coll. Marquis de Folin. 
Monterosato (1878) considered this variety as a good species : 
it seems to me’searcely separable. Dr. Kobelt adopts for this 
species the name of Hydr. stagnalis, Bast., ‘to which he joins 
ventrosa, Mtg.”, as a variety, but separates Hydr. baltica, 
Nilss. as a distinct species. 
2. Hydrobia ventrosa. 
Turbo ventrosus, Montagu, Test. Brit. II, 1803 ; fide Jeffreys=Cycl. acu- 
tum, Drap. 1805 ; fide Mirch, 1871, should be H. stagnalis, Baster 
(1762) =ventrosa, Mtg.=baltica, Nilss.=H. octona, Lin, 
20 England ; coll. G. Nevill, Esq. 
3 Neuwerk (Germany) ; ex “ Linnea”, 
var. baltica [? dist. sp.] 
Paludina balthica, Nilsson, Hist. Moll. Sueciae, 1822, Baltic; fide Sars= 
Cingula minuta, Totten. 
8 Oldenburg; ex “ Linnea” (as “ H. baltica, Nilss.’’), 
3. Hydrobia, sp. 
7 Oran ; coll. P. Joly, Esq. (as “ H, Oranensis, Bourg.”). 
var, (? dist. sp.) 
6 Oran; coll, P. Joly, Esq. (34, 12). 
4. Hydrobia peraudieri. 
Hydrobia Peraudieri, Bourguignat, Rev. Mag. Zool. 1862, Biskra, Tuggurt, 
and fossil at Géryville—long. 6 to 7, diam. 13 mil, 
