RlSSOIDiE. 47 



var. obeliscus. 



Assiminea obeliscus, Palndiihe, Jiev. Mag. Zool. 1800, lonr/. 5, diam. 3 mil.. 

 River Made ; emend. Palad., 1874, long. 7, diam. 3\ mil., as Peringia 

 obeliscus. 



14 "Marees de la Mactc," Oran ; coll. P. Joly, Esq. (as " Peringia obe- 

 liscus, Pal."). 



var. pictonum. 



Peringia pictonum, Paladllhe, Ann. Sci. Nat. I, 1874, Charente Inf: 

 and Vendee — long. 6 to 7, diam. 5^ mil. 



20 Lake Ossigor [S. W. France] ; coll. Marquis de Folin. 



Monterosato (1878) considered this variety as a good species : 

 it seems to me scarcely separable. Dr. Kobelt adopts for this 

 Bpecies the name of ILgdr. sku/naJis, Bast,, *' to which he joins 

 ventrosa, Mtg.", as a variety, but separates Ilydr. haltlca, 

 Nilss. as a distinct sjoecies. 



2. Hydrobia ventrosa. 



Turbo vcntrosufl, Montagu, Test. Brit. II, 1803 ; fide Jeffreys =Cycl. acu- 

 turn, Drap. 1805 ; fide March, 1871, should he H. stagnalis, Baster 

 {1762) = ventrosa, Mtg. = baltica, Nilss. = II. octona, Lin, 



20 Kngland ; coll. G. Novill, Esq. 

 '6 Neuwerk (Germany) ; ex " Linna^a". 



var. baltica [ ? dist. sp.] 



Paludina balUiica, Nilsson, Hist. Moll. Sueciae, 1822, Baltic ; fide Sars== 

 Cingula minuta, Totten. 



3 Oldenburg; ex " Linuffia" (as " H. baltica, Nilss."). 



3. Hydrobia, sp. 



7 Oran ; coll. P. Joly, Esq. (as " II. Oranensis, Bourg."). 



var. (? dist. sp.) 

 6 Oran; coll. P. Joly, Esq. (3^ 12). 



4. Hydrobia peraudieri. 



Hydrobia Peraudieri, IJourguignat, Bevi. Mag. Zool. 1862, BisJcra, Tuggurt, 

 and fossil at Qeryville — long, 6 to 7, diam, 1^ mil. 



