History of British animals - University of Guam Marine Laboratory

Paludina. MOLLUSCA. PECTIMBRANCHIA. 3153. E. plicattts.—^C'onical, transversely striated, base angular, sides flattened,central cavity plaited or deeply striated ;aperture oblong.— Cirus plicatus,Sower. Min. Conch, t. cxli. f. 3.— Chalk Marl, Folkstone.4. E. perspectivus—Obtusely conical ; spirally striated, central cavity deep,exposing one-third of each whorl; aperture transversely oblong Cirus per.Mant. Geol. 194. t. xviii. f. 12, 21. Sower. Min. Conch, t. ccccxxviii. f. 1, 2.—In Chalk.5. E. depressus — Subdiscoid, concentrically striated ; central cavity wide,exposing a small portion of each whorl ;an angular canal runs round thespire; aperture obtusely angular.— Cirus depressus, Mant. Geol. 195. t.xviii. f. 18, 22. Sower. Min. Conch, t. ccccxxviii. f. 3 In Chalk.6. C» granulatus.— Conical; whorls five or six, obscurely quadrangular, ornamentedwith regular transverse granulated striae.— Mant Geol. 195UpperChalk.7- C. Sowerbii.— Conical, spiral, smooth, umbilicate; inner wreaths anchylosedslightly inserted ; aperture indented by the preceding volution. Ver.micularia Sower. Mant. Geol. iii. t. xviii. f. 14. 15.— Grey Chalk Marl.8. C. Bognorensis— Spiral, last volution much produced, inferior side deeplyumbilicate—Verm. Bog Alant. Geol. 272.Gen. LVI,— 267. P. vivipara.— Whorls five or six, rounded ;separatingline deep apex like a minute tubercle.;Cochlea maxima, List. An. Ang. 133. t. ii. f. 18. Conch, t. cxxvi. f. 26.— Helix vivipara, Linn. Syst.i. 1247—Nerita viv. Mull. Verm. ii.PALUDINA.— Shell conical, mouth a little longerthan broad ;pillar-lip simple.182,—Hel. viv. Mont. Test. Brit. 38(3— Cyclostoma viviparum andachatinum, Drap. Moll. 34, 36.— In the slow running rivers of Eno-.land.Length sometimes an inch and a half, the breadth one inch ;olive-green,with three brown spiral bands ; whorls with an abruptly fine apex, irre