153 



partem efformans; 1. 5 — 6, d. 2 mra. {Gallia, ins. St.-Marguerite, 

 Bdgia ad Namur.) Fig. Dup. Hist. t. 15. f. 7. 



4. Petrseus Albers. Testa ohlongo-conica vel cylindra- 

 ceo-ohlonga, suhito attemiata, cornca, alhida, unicolor; 

 anfr. 6 — 8, planiiJati, idtimus spira hrevior; aj^er- 

 tura ovalis, colnmeUa pliis minusve distincte plicata; 

 peristoma late expansiim vel rcflexum, marginihus 

 approximatis, callo junctis. 



Hahitat in desertis lapidosis asiaticis, duse tantum species in- 

 colse Europae sunt. Fossilis modo in strato oligocenico et mio- 

 cenico infero. 



50. B. niveus Parr. ap. Rossm. (1859): t. attenuato-cylin- 

 dracea; apertura truncato-subrotundata, margine exteriore labiato, 

 supra obsolete tuberculifero ; alt. 23, lat. 5 mm. (Tauria.) T. alba, 

 striatiila, apice conico, obtusato, anfr. 8, couvexiuscuH, ultimus stria- 

 tus, basi compressiusculus, apert. ^^ altitudiuis nondum sequans, pe- 

 ristoma patulum, columella remota, strictiuscula. Syn. B. turbatus 

 Parr. ap. Mouss. Fig. Rossm. Icon. f. 916. 



51. B. cosensis Reeve: t. oblongo-turrita; apertura trun- 

 cato-ovalis, peristomate subsimplici; loug. 15, diam. 5 mm., ap. 

 5 mm. longa. (Ins. Cos Arcbipelagi gra^ci.) T. coerulescenti-alba, 

 substriata, nitida, spira turrita, obtusa, anfr. 7, summi convexi, se- 

 quentes subplani, ultimus V3 longitudinis vix attingens, basi rotunda- 

 tus, cohimella leviter arcuata, peristoma marginibus vix conniventi- 

 bus, dextro breviter expanso, columellari reflexo. 



Gen. Cochlicopa (Fer.) Risso. 



Animal cidem generis Helicis simitc, sed organis gene- 

 rationis simpliciorihus; maxilla parimi arcuata, striis vcr- 

 ticalihus suhtilihus cxarata.^ marginc concavo vix denticu- 

 lato; dentes radulce suhquadrafi, in series transversales 

 dispositi. 



Testa parvuJa, imperforata, ovato-ohlonga, ovato-elliptica 

 vel hulimiformis, nitida v. splendida, pcMucida, epidermide 

 destituta; anfr. 6 — 7, ultimus rotundatus; sutura margi- 

 nata; apcrtura orata, V3 — V2 longitudinis circiter cBquans; 

 columclla hrcvis, arcuata, plus minusve truncata, pcristo- 

 ma rectum, suhincrassatum. 



