Hydrobia ulviy, v Barlet'i, /e^. 



Hydrobia ulv?e, v octona, Z. 



Hydrobia ulvie, v tumida, Mar. 



Hydrobia ulva3, v decollata, Mar. 

 Hydrobia siimilis, Drap. 

 Hydrobia ventrosa, Mont. 



Hydrobia ventrosa, v minor, Jeff. 



Hydrobia ventrosa, v decollata,/"^ 



Hydrobia ventrosa, v ovata, Jeff. 



Hydrobia ventrosa, v elongata, Jeff. 



Hydrobia ventrosa, v pellucida, Jeff. 



Family X.— HETEROPHROSYNID>E, Clark. 

 Genus I.— Barleeia, Clark. 

 Barleeia rubra, Mont. 



Barleeia rubra, v unifasciata, Mont. 

 Barleeia rubra, v pallida, Jeff. 



Genus II.— Jeffreysla, Aid. 

 Jeffreysia diaphana, Aid. 

 Jeffreysia opalina, Jeff. 

 Jeffreysia GLOBULARis,y^. 



Family XL— SKENEID>€:, Clark. 

 Genus I. — Skenea, Fleni. 

 Skenea planorbis, Fabr. 



Skenea planorbis, v trochiformis, Jeff. 

 Skenea planorbis, v maculata, Jeff. 

 Skenea planorbis, v hyalina, Jeff. 

 Genus II. — Homalogyra,yi?^ 



HOMALOGYRA ATOMUS, Phil. 



Homalogyra atomus, v vitrea, Jeff. 

 HoMALOGYRA ROTA, F. and H. 



Family XII.— VERMETID>E, HOrb. 



Genus Cascum, Flein. 

 C^CUM TRACHEA, Mont. 

 CiECUM GLABRUM, Mont. 



