AND ALLIED FORMS. 4T 



shells of Cuba/ and D'Orbigny himself says that the species was 

 found at Guadeloupe, " at the mouth of a rivulet." The conclusion 

 would naturally follow that D'Orbigny was misinformed with re- 

 gard to its habitat, and that it is not a marine, but a fresh-water 

 species. I adopt this conclusion the more willingly on account 

 of the close agreement of the shell of P. Auberiana with the 

 South American fresh-water P. culminea ; both having a form 

 rarely found among the shells of the marine Hydrobia3. If, 

 however, I should prove to be mistaken in this conclusion, 

 Paludestrina Auberiana will doubtless be found to be a Hy- 

 drohia, of which D'Orbigny's name will then become a synonym. 

 In this case I would propose the name Heleobia, for P. culminea 

 and its allies. 



PYRGUI^A, Chrtstofori & .Tan. 



Pyrgula, Christofoki & Jan, Consp. Mtlth. Moll. (1832); and Mant. Catal. 

 test., (1832) p. 4. 



Shell elongated, turreted, imperforate ; whorls carinated. Aper- 

 ture oval, effuse anteriorly ; outer lip not thickened. Operculum 

 corneous, with projections on the outer margin, corresponding to 

 the concavities of the carinae of the shell. In the soft parts of 

 P. bicarinata, according to Moquin-Tandon, the foot is " narrow, 

 obtuse, and as if bilobate in front, somewhat pointed behind," and 

 the tentacles are slender. 



Lingual dentition unknown. 



Station, fresh waters in mountainous regions. 



Distribution, Europe and South America. 



Type P. helvetica, H. & A. Adams, Gen. of Rec. Moll., I, (1854) 309, pi. 

 xxxii, fig. 7. — Melania helretica, Michelin, Mag. de Zool., 1831, p. 37, pi. 

 xxxvii. — Pynjnla cnu7ulata, Christ. & Jan, Mant. Catal. Test. (1832) p. 4. 

 Of a white color. H tb. Switzerland. 



The following are all the other species as yet known : — 



P. bicarinata, Boukgcionat, Rev. et Mag. de Zool., [2] XIII, (1861) 528. 

 — Bythinia bicarinata, Dupoy. — Bythinella bicarinata, Moq.-Tand., Hist. 

 Nat. des. Moll. ter. et fluv. de France, II, (1855) 520, pi. xxxviii, fig. 39- 

 42. France. 



P. pyrenaica, Bourguignat, loc. cit., [2] XIII, (1861) 530. Pyrenees. 



P. andicola, STyi.—Paludi'Strina amlicola, D'Okb., Voy. Am. Merid.,Moll., 

 p. 385, pi. xlvii; fig. 13. Andes of Bolivia. 



» Mem. sobre la Hist. Nat. de la Isla de Cuba, II, (1856) 10. 



