RISSOID^J. 47 



var. obeliscus. 



Assiminea obeliscus, Paladilhe, Rev. Mag. Zool. I860, long. 5, diam. 3 mil., 

 River Macte ; emend. Palad., 1874, long. 7, diam. 3| mil., as Peringia 

 obeliscus. 



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



Kacus, Pal.")- 



var. pictonum. 



Peringia pictonum, Paladilhe, Ann. Sti. Nat. I, 1874, Charente Inf: 

 and Vendee 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 scarcely 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. laltica, 

 Nilss. as a distinct species. 



2. Hydrobia ventrosa. 



Turbo ventrosus, Montagu, Test. Brit. II, 1803 ; fide Jeffrey s=Cycl. acu- 

 tum, Drap. 1805 ; fide MorcTi, 1871, should le H. stagnalis, Raster 

 (1762) = ventrosa, Mtg. = laltica, Nilss. = H. octona, Lin. 



20 England ; coU. G. Nevill, Esq. 

 3 Neuwerk (Germany) ; ex " Linnsea". 



var. baltica [ ? dist. sp.] 



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

 Cingula minuta, Totten. 



3 Oldenburg; ex "Linnaja" (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. (3i, If). 



4. Hydrobia peraudieri, 



Hydrobia Peraudieri, Bourguignat, Rev. Mag. Zool. 1862, Biskra, Tuggurt, 

 and fossil at G-eryville long. 6 to 7, diam. 1\ mil. 



