mssoiD^. 47 



var. obeliscus. 



Assiralnea obeliscus, PaladiJhe, Rev. Mag. Zool. 1860, long. 5, diam. 3 mil., 

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

 obeliscus. 



14 "Marees 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 Vendee — long. 6 to 7, diam. 5| mil. 



20 Lake Ossigor [S. W. France] ; coll. Marquis cle Polin. 



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

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

 species tlie name of Hyclr. stagnalis. Bast., " to whicli lie joins 

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

 Nilss. as a distinct species. 



2. Hydrobia ventrosa. 



Tui-bo ventrosus, Montagu, Test. Brit. II, 1803 ; fide Jeffreys=Cycl. acu- 

 turn, B rap. 1805 ; fide Morch, 1871, should be H. stagnalis, Baster 

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



20 England ; coll. G. Nevill, Esq. 

 3 Neuwerk (Germany) ; ex " Linnsea". 



var. baltiea [ ? dist. sp.] 



Paludina baltliica, Nil'sson, Mist. Moll. Sueciae, 1822, Baltic ; fide Sars = 

 Cingula miniita, Totten. 



3 Oldenburg,- ex " Linna3a" (as "H. baltiea, Nilss."), 



3. Hydrobia, sp. 



7 Oran ; coll. P. Joly, Esq. (as " H. Oranensis, Boiu-g."). 



var. (? dist. sp.) 

 6 Oran J coll. P. Joly, Esq. (3i, If). 



4. Hydrobia peraudieri. 



Hydi'obia Peraudieri, Bourguignat, Rev. 3Iag. Zool. 1862, BisJcra, Tuggurt, 

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



