46 RTSSOID^. 



18. Stenothyra, sp. 



1 Java (?) ; coll. Baron F. von Riclithofon. 



Not tlie species figured hj Mousson. 



19. Stenothyra woodmasoniana. 



Stenothyra woodmasoniana, O. Nevill, J. A. S. B. ISSO, Pi. Canning, long. 

 31, diam. {vix) 2 mil., and Oj). c, 18S1, pi, VII, fig. 8. 



10 Port Canning (type) ; coll. J. WDod-Mason, Esq. 



4. Family EISSOID/E, Grai/. 

 Subfamily HYDBOBIIN^, Troschel [emend.]. 



Genus HTDROBIA, Rartmann. 



Sturm, Fauna Deutschland, 1821, types S. acuta, vitrea, and minuta \_sine 

 descr.'] ; type restricted Hydr. acuta, Drap., Fischer, J. de C. 1878; = 

 Faludestrina, Orb. (pars). Toy. Amer. Merid. 1S39, p. 381, type P. nigra. 

 Orb. Sfc. ;^=Fcrobia, Stimpson, 1865, type Turbo minutus, Totten ;=Lit- 

 iorinella, Braiin, 1842, and of Thomae, Jahrb. Ver. Naturh. Nassau, II, 

 p. 125, 1845, type Hydr. acuta, Drap. ;=Feringia, Palad., Ann. Sci. 

 Natur, 1874, type S. ulvae, Iltg. ; sect. = Thermhydrohia, Patducci 

 1878, type Hydrobia aponensis, v. 3Iartens. 



The animal of Hydrohia [as " Littoriuella''] is generieally 

 distinct from that of Peringia [a.s " Hydrobia"], according to 

 Stimpson. Gray, in Tnrton's Manual, 1840, proposed Tarbo 

 ulvae. Pennant, as tj-pe of the genus, but this cannot, however, 

 be so accepted, because it "was not one of Hartmann's original 

 type species. 



1. Hydrotoia ulvse. 



Turbo Ulvae, Pennant, Brit. Zool. 1776; fide Jeffreys=Pal. muriatica, Lam. 

 and \_p. 3102=^Cycl. anatinum, Drap. ; fide MVrch, 1871=11. Jeverensis, 

 Schrbter, ivith var. grandis, from Denmark, long. 9k '>nil, 



20 Sliorcham and Weymouth ; coll. 0. Nevill and T. F. Nevill, Essfirs. 



