BELLINI : FRESHWATER SHELLS OF NAPLES AND NEIGHBOURHOOD. 4I 



Var. major Locard. — " Etud. sur les variat," I., 1881, p. 312. 

 Larger; rare. 



(14) P. (Aplexa) hypnorum L. sp. — "Syst. Nat.," Ed. X., I., 



p. 727 {Bulla); Miill, "Verm. Hist.," II., p. 169, nr. 354 {Pla?iorlns 

 tnrritus). Not common, on plants, near borders of rivulets and on 

 moist mosses. Tliis species is well distinguished by its yellow gold 

 color, its lustre and elongated form. 



PROSOBRANCHIATA. 



Hydrobiid^. 



(15) Pseudamnicola macrostoma Kiister sp.— "Chem. Conch. 

 Cab.," ed. nova, 1845, p. 73, t. 13, f. 5-7 {Paludina) ; Fitzgerald, 

 "Land Shells of Capri," J. Conch. ^ 1877, vol. i., p. 12 {Bithynia 

 similis, non Drap.). Very rare in Capri with Ancyhis margaritaceus 

 and also in a fountain in the Botanical Garden. 



The species of the genus Pseudamnicola Paulucci, 1878, were 

 included by some authors in the American genus Ainnicola Gould et 

 Hald., from which they were separated by the characters of the radula, 

 which is furnished only with a small basal tooth. 



(r6) Bithynia tentaculata L. sp.— "Syst. Nat.," Ed. X., I., p. 

 774 {Helix); Miiller, "Verm. Hist.," II., p. 185, nr. 372 {Nerita 

 iaciilator) ; Drap., "Tabl.," 1801, p. 41 {Cyclostoma inipuruni) ; Costa, 

 "Catal. test, due Sicilie," 1829, p. Icvii., nr. 43 {Helix t.) ; Phil, 

 "Moll. Sic," I., p. 148 {^Paludina inipura), II., p. 122. Common, 

 Avith its varieties, in numerous colonies, in every water or fountain. 

 This form is ancient and dates from the miocene period to the present. 

 Very variable; the extreme variations of form are: var. codia, swollen, 

 and var. producta, elongated. 



Var. producta Menke.— "Syn. method, mollusc," 1830, p. 41. 

 More elongated than the type and large; pale yellowish in color; rare. 



Var. ventricosa Westerlund. — "Fauna Sueciae," 1873, p. 460 

 (=var. neapolitana Blanc, /// schedis). Swollen form. 



Var. codia Bourg. — "Spic Malac," p. 136, t. viii., f. 5-7, 1862. 

 Also more contracted variety and the last whorl occupies almost the 

 whole shell. The type lives in Pisa, and is common in Central Italy. 



Var. sebethina Blanc {in schedis). — Coutagne, "Note faune 

 malacol. bass, du Rhone," I., 1881, p. 24 ; Locard, "Catal. gendr. 

 moll. terr. et fluviat. de France," p. 224, 1882; Locard, Ann. Mus. 

 Hist. Nat. de Getieve 1894, p. 85, pi. v., f. 3. Rather a common 

 form in the River Sebeto. 



Var. fulva Locard. — "Etudes sur les variat.," etc , 1881, p. 367. 

 Reddish color; common. 



