RISSOID^. 49 



11. Hydrobia aehaja. 



Hydrobia aehaja, Clessin, Malak. Bldt. XXV, 1S78, Euhoea. 

 8 Eubcea; ex "Linnsea" and P. Bouvier, Esq. 



12. Hydrobia thiessesB. 



Hydrobia Thiessese, Clessin (uhi 1). 



8 Euboea ; ex " Linnsea" and P. Bouvier, Esq. 

 Seems to me scarcely separable from tlie prececTino". 



13. Hydrobia aponensis. 



Hydrobia aponensis, von Martens, Wiegm. Arch. 1867, Ahano, for Paludina 

 thermalis, Kiister, Sfc. {not of Lin.) ; sect. Thermhydrobia. 



3 Abano (Padua) ; ex " Linnaea" (as " Hydr. thermalis, Lin."). 



Subgenus BYTHINELLA, Moquin-Tandon. 



J. de C. 1851, p. 239, and Hist. Moll. 1856, type Bulimus viridis, Poiret ; 

 sect. = Belgrandia, Boiirg., Moll, quart. Seine, 1869, type £. gihba Brap.; 

 sect. = Vitrella, Clessin, 1877, type P. pellucida, Benz ; sect. = Frauen- 

 feldia, Clessin, 1879, type F. lacheineri, Clessin ; sect. = Maresia, Bourg., 

 Bull. Soe. Toulouse, 1877, type Hydr. dolicUa, Bourg.; sect. = Stimpsonia, 

 Clessin, Mai. Bldt. XXV, 1878. 



Dr. Kobelt joins the sections Maresia and FrauenfeJdia ; but 

 if this is adopted, tlie former name must have priority. M. de 

 Folin lias suggested tliat the group Vitrella may be the same 

 as his Locardia ; M. Bourguignat considers them as distinct : 

 if they prove identical, both names must yield priority to M. 

 Bourguignat's genus Lhotelleria, which is unmistakeably the 

 same as Locardia. 



14. Hydrobia (Bythinella) obtusa. 



Paludinella obtusa. Lea, Trans. Am. Philos. Soc. IX, 1844, Ohio ; sect. 

 Stimpsonia, 



2 New York ; coll. Prof. E. C. Stearns."^ 



15. Hydrobia (Bythinella) binneyi. 



Pomatiopsis Binneyi, Tryon, P. Philad. Ac. 1863, Bolinas, California ; 

 ? sect. Stimpsonia. 



20 Baulines Bay ; coll. Prof. E. C. Stearns. 



