136 C. A. Westerhmd^ Synopsis Molluscomm Extramarinor. Scandin. 



Fam. Rissoidae. 



Sublam, Hydrobiina. 



Testa minuta; operculum coriaceum v. coimeum, spircde, spiris 

 paucissimis (1 — 2^l2>-, rapide accrescentihus, profunde immersum, 

 nucleo valde excentrico. 



Gen. Hydrobia Hartm. 



H. steini Mart. (Arch. f. Naturges. 1858). T. riaiato-subperfo- 

 rata, turrito-conica^ cylinclracea, tenuissime striatula, cor- 

 neo-virescens, spira obtuso-subtruncata, longior quam aper- 

 tura; anfr. 5, sat lente regulariter accrescentes, convex!, 

 sutura canaliciilata, ultimus convexo-rotiinclatus; apertura 

 ovalis, superne obtusissime angulata. peristomate connexo. 

 Alt. 373—372, lat. 176—2 mm. 



Hah. Sitecia in Skane (Wesum pr. Lund, Kristianstad), 

 Blekinge (Bastasjo &c.), Smaland (Jonkoping), Gotland (Gothem), 

 Ostergotland (Kimstad et in palude ad Ljungstorp), Westergot- 

 land (Kopparsjon pr. Molltorp, Goteborg), Nerike (Svartan pr. 

 Hjelmaren), Upland (Upsala). — Dania ad Kjobenhavn, Esromso 

 et Voroso (H. L.). 



Var. scholtzi A. Schm. (BinnenmoU. Norddeutschl. 1856): t. 

 ovato-conica, spira vix longior quam apert., late conica, 

 anfr. 4, altitudine lente, latitudine celeriter accrescentes, 

 ult. ventrosus, ad sinistrum dilatatus; alt. 2 — 2^/4, lat IV2 

 — 2 mm. — Suecia ad Ronneby (in lacubiis Herrstorpsjon 

 & Langasjo). — Finland ad Frugard (E, N.). 



Fam. Talvatidae. 



Testa discoidea usque ad conoidea, apertura siibcircu- 

 laris, marginibus continuis; operculum multi- et arcte- 

 spirale^ nucleo cejitrali^ profunde immersum. 



Gen. Valvata Mull. 



1. Cincinna Hilhn. T. turUnoidea^ umbilico angusto, scepins ad 

 partem obtedo. 



V. antiqua Sow. (Mag. of Nat. Hist., 1838). T. anguste, ssepe 

 obtecte, perforata, ovato-conoidea, dense striatula, spepe 



