46 RISSOIDJB. 



18. Stenothyra, sp. 



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

 Not the species figured by Mousson. 



19. Stenothyra woodmasoniana. 



Stenothyra woodmasoniana, Q. Nevill, J. A. S. B. 1880, Pt. Canning, long. 

 31, diam. (vix) 2 mil., and op. c., 1881, pi. VII, Jig. 8. 



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



4 Family RISSOUXE, Gray. 



Subfamily HYDROBIIN^l, Troschel [emend.]. 



GENUS HYDROBIA, Hartmann. 



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

 descr."] ; type restricted Hydr. acuta, Drop., Fischer, J. de C. 1878; = 

 Paludestrina, Orb. (pars), Voy. Amer. Merid. 1839, p. 381, type P. nigra, 

 Orb. tyc. ;=jEcrobia, Stimpson, 1865, type Turbo minutus, Totten ;=Lit- 

 torinella, Braun, 1842, and of Thomae, Jahrb. Per. Naturk. Nassau, II t 

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

 Natur. 1874, type H. ulvae, Mtg. ; sect. = Thermhydrobia, Paulucci 

 1878, type Hydrobia aponensis, v. Martens. 



The animal of Hydrobia [as " Littorinella"~] is generically 

 distinct from that of Peringia [as " Hydrobia"] , according to 

 Stimpson. Gray, in Turton's Manual, 1840, proposed Turbo 

 ulvae, Pennant, as type of the genus, but this cannot, however, 

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

 type species. 



1. Hydrobia ulvse. 



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

 and [p. 3W]=Cycl. anatinum, Drap. ; fide March, 1871=H. Jeverensis, 

 Schroter, with var. grandis,from Denmark, long. 91 mil. 



20 Shoreham and Wey mouth ; coll. G. Nevill and T. F, Nevill, Esqrs. 



