30 Moll. 
MOLLUSCA. 
Rissoa (^Alvania) emaciata^ sp. n., Morch, 1. c, p. 54, West Indies. 
Rissoa chilostoma, agnewi^ cyclostoma^ melanura^ angeli, R. (Setia) 
siennoi, R. {Cingula) athinsoni, and R. {Ceratid) ?wacco^i, spp. nn., J. E. T. 
Woods, P. R. Soc, Tasm. 1876, pp. 24-26, Tasmania. 
Alvania fasciata, new name for Dunheria fasciata of the same author, • 
1. c. p. 24. 
Eatoniella substituted for Eatonia (Zool. Rec. xii. p. 165), which is 
pre-occupied ; Dali, Bull. U. S. Mus. No. 3, p. 42. 
Rissoina. The known species from the West Indies examined and 
reduced froiji 31 to 8-10 ; H. Krebs, P. Sc. Ass. Trinid. 1873, 12 pp. 
R. multicostata (Schwartz v. Mohrenstern, nec Orb.) renamed hrehsi ; 
Morch, Mai. Bl. xxiii. p. 50, West Indies. 
Rissoina supra-costata (Garrett, 1875) = montrouzieri (Souverbie, 
1862), and terebra (Garrett, 1875) = incerta (Souverbie, 1862); P. 
Fischer, J. de Conch, xxiv. p. 150. R. flindersi^ st. Isanctce-I clarce^ and 
concatenata, spp. nn., J. E. T. Woods, 1. c. pp. 26 & 27, Tasmania. 
Rissoina (Zebia) vitrinella, sp. n., Morch, Mai. Bl. xxiii. p. 45, St* 
Thomas, West Indies. 
Zebinella, new subgenus of Rissoina, containing the ribbed and spirally 
striate species; type, (Montagn). Also R. (Z.) signifer,sp.n., 
New Providence, Bahama Islands. Id. 1. c. pp. 47 & 48. 
Phosinella, new subgenus of Rissoina. Shell reticulated, aperture 
deeply sinuate ; operculum with a styliform and toothed apophysis. R. 
sagraiana (Orb.), pulchra (O.B. Ad.), cancellata (Phil.), labrosa, fenes- 
trata, and bicollaris (Schwartz v. M.), privati (Polin). Id. 1. c. pp. 51 
&'52. 
Pachydrobia, g. n. “ Testa imperforata, oblongo-ovata, Rissose- 
formis, crassiuscula ; spira mediocris ; sutura impressa ; aufractus sat 
numerosi, mediocriter convex!, ultimus ventre planatus ; apertura semi- 
circularis ; peristoma sinuosum, incrassatum, continuum, marginibus 
callo valido junctis. Operculum subulatum, tenue, corneum, pauci- 
spiratum, apice antico.” Freshwater. P. paradoxa, sp. n., Crosse & 
Fischer, J. de Conch, xxiv. pp. 320 & 321, pi. x. fig. 3, Mekong River. 
[Melania parva (Lea) apparently also belongs to this genus.] 
Hydrobia vitrea (Drap.) var. quenstedti (Wiedersh.) ; several varieties 
in form, dead shells found in an open fountain. Weinland, Wiercht. 
Schwab. Alb, pp. 104-111, pi. iv. figs. 9-13. [Cf., Zool. Rec. x. p. 147, 
and xi. p. 145]. Anatomy of the same by Rougement, Etudes s. 1. faune 
des eaux priv(3S de lumiere, 1876, 4to, with pi. 
Hydrobia caspia (Eich.), Caspian Sea, redescribed, pp. 150-153, pi. vi. 
fig. 15 ; H. spica (Eichw.), figured, fig. 13 ; II. stagnalis (L.), specimens 
from the Caspian Sea described, p. 153, pi. vi. fig. 12 : Grimm, Kaspins- 
koe more i ego fauna, i. 
Hydrobia martensiana and maxima^ spp. nn. (12 and 31 mm. in 
height) ; Dybowski, Mem. Ac. Petersb. (7) xxii. pp. 25 & 27, pis. i. figs. 
18 -27, viii. figs. 17-20, Lake Baikal. 
Amnicola petterdiana and simsoniana, spp. nn.. Brazier, P. Linn. Soc. 
N. S. W. i. p. 10, Tasmania. 
