BIVALVE SHELLS. 2/5 



elevatis, crassiusculis, utrinque duplicibus iu valvula dextra; 

 simplicibus in sinistra. 



Musculus Huviatilis, Gualt. Ind. Test. pl. 7- f- C, C. 

 Tellina amnica, Mull. Verm. Hist. ii. 205. no. 381) ; Zool. Dan. 

 Prodr. ]). 24G. no. 2967. 



Chemn. Conch. vi. 138. pl. 13. f. 134. 

 Wood, Gen. Conch. p. 153. no. 19. pl. 47. f. 6; Ind. Test. 

 pl. 3. f. 19. 

 Tellina striata, Schrbt. Flussconch. p. 193. no. 15. 

 Tellina rivalis, Mat. Sf Rack. Linn. Trans. iii. 44. pl. 13. f. 37, 38. 



Donov. Nat. Hist. of Brit. Shells, ii. pl. G4. f. 2. 

 Cyclas palustris, Drap. Tobl. des Moll. p. 106. no. 3; Hist. des 



Moll.i^. 131.pl. 10. f. 17, 18. 

 Cardium amnicum, Mont. Test. Brit. p. 86. no. 15. 



Turt. Brit. Fauna, p. 154. 

 Cyclas obliqua, Lamk. An. s. Vert. v. 559. no. 4. 

 Nilsson, Hist. Moll. Suec. p. 99. no. 4. 

 Alder, Trans. Nat. Hist. Soc. Newcastle, i. 41. f. 71. 

 Pisidium obliquum, C. Pfeiff. Syst.An. p. 124. no. 1. pl. 5. f.l9, 20. 

 Cyclas amnica, Turt. Conch. Ins. Brit. p. 250. pl. 11. f. 15. 

 Pisidium amnicum, Jenyns, Trans. Cambr. Phil.Soc.iv. 309. 110.6. 

 pl. 19. f. 2. 



Gray, Turt. Man. ed. 2. p. 285. no. 120. pl. 1. f. 5. 

 Forbes Sf Hanley, Hist. ofBrit. MolL ii. 133. pl. 37. f. 8, 9, & 

 pl. O. f. 8. 

 Pera fluviatilis, Leach, Mus. Brit. (teste Jenyns, Cambr.Phil. Soc. 



iv. 310) ; Moll. Brit. Syn. ed. Gray, p. 292. no. 3. 

 Pera Ilenslovviana, Leach,Brit.Mus.{testeJenyns,loc.cit.Y>.S\0) ; 



Moll. Brlt. Syn. p. 291. no. 1. 

 Pisidium inflatum, Megerle in Porro, Malac. Comasea, p. 121. 

 no. 109. pl. 2. f. 13. 



Villa, Dispos. Meth. Conch. p. 44. 

 Pisidium Pfeifferi, Ziegler (sec. Stentz) inPorro,Malac. Comasea, 



p. 121. 

 Pisidium palustre, Porro, Malac. Comasea, p. 122. no. 3. 

 Villa, Disp. Meth. Moll. p. 44. 

 Spinelli, Cat. Moll. Bresciana, p. 20. no. 136. 

 Cordula amnica, Leach, Moll. Brit. Syn. ed. Gray, p. 293. no. 1. 



Hab. In aquis dulcibus Euroj)8e. 



2. PlSUM CASERTANUM. B.M. 



P. testa crassa, ovali, tumidiuscula, valde obliqua, latere antico 

 posticum fere duj^lo superante, tenuissime transversim striata, 

 pellucida, comea, fragili, apicibus integris, obtusissimis, ssepius 



