Acta Societatis pro Fauna et Flora Fennica, XIII, n:o 7. 133 



pressa, tandem lente longeque descendens; peristoma conti- 

 nuum affixum; operculum (ut apertura) ovatum, superne 

 angulatum. 



Typus: t. ventroso-conoidea, sat tennis, nitida, flavido-cornea, 

 anfr. 5 — 6, superi 3 — 4 regulariter in spiram brevem 

 late conicam attenuati, ultirai duo majores, plns quam 

 2/3 altitudinis totius occupantes, ult. ventroso-convexus, 

 apert. subovalis, margine colum. fortius incurvato, oper- 

 culum lineis concentricis tantum 1 — 2 elevatis, cfeteris 

 tenuissimis; alt. 8 — 10, lat. 5 — 6 mm. — Nerita jaculator 

 Miill. (1774), Palud. impura Drap. (1805). 



Forma gigas Morch (Syn. Moll. Dan., 1864). t. rimata, 

 late ovata, anfr. ult. lineis transversis 2 — 3 eleva- 

 tis, apice eroso et lamina plana suppleto; alt. 15, 

 lat. 9, ap. a. 7, 1. 5 mm. — Suecia in Skane (Hojea). 



— Dania in Viborg So. — Fennia in Aland (in 

 palude ad Godby: Mus. Helsingf.). 



Forma intncata W. (Naclir. blatt Mal. Ges. 1894), t. 

 miuor, operculum lineis incremeuti concentricis 

 omuibus valde elevatis, interstitiis densissime 

 striatulis. — Suecia ad Borgholm frequens. 



Forma geniina W. (Nachr. blatt Mal. Ges. 1894), t. 

 operculo extus spatio lato Isevi vel striatulo, lineis 

 incrementi concentricis 3 — 5 internis forte elevatis. 



— Suec. ad Ultuna prope Upsala frequens. 



Var. prodnda Mke. (Syn. ed. 2, 1830): t. major, elongato-co- 

 nica, solidior, cornea, anfr. 6 — 7, spira elongata quam apert. 

 longior, acuta, anfr. ult. elongatus, parum convexus, ajsert. 

 angustior, acutior; a. 12—15, lat. 7—8 (18:10) mm. — Sue- 

 cia in Skane et Ostergotland inventa. 



Var. ventncosa Mke. (Syn. ed. 2, 1830): t. vix rimata, ventrosa, 

 tenuis at firma, cornea, nitidula, anfr. 5, sat celeriter ac- 

 crescentes, convexi, nunc perdistincte, nunc obsolete su- 

 perne ad suturam sat impressam planati et angulati, ult. 

 ventrosus, superi 3 sat abrupte in spiram breveni anguste 

 conicam attenuati, apert. quam spira paullo brevior, rotun- 

 dato-ovata, marginibus teque arcuatis; alt. 10, lat. 7 mm. 

 — Suecia ad Stockholm (Nya Brunnsviken: J. W.). — Fen- 

 nia in Ladoga (Mus. Helsingf), „B. inflata Hansen, telle 

 que je Tai compris dans ma monographie, avec Bourguig- 

 nat'' (Locard in lit.). 



Var. hoitnica (Anders.) CI, (Malak. Blatt. 1878): t. firma, flavo- 

 virescens vel fulva, forte spiraliter lineata, rugis incre- 



