MOLLUSC A CTENOBRANCHIA. 
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Rissoa plica, Caiitraine, Bull, de Brux. ix. 2, p. 346 ; smooth ; milk 
white ; columella with a fold above ; allied to R. monodonta, Philippi : 
Sardinia. R, subventncosa, id. ib. ; greenish horn coloured ; narrow folds 
longitudinally with vertical stripes ; labrum outwardly slightly eniar- 
ginated : Ostia. R. marmorata, id. ib. ; greenish ; marbled dirty browm ; 
white at the base ; pointed with minute stripes : Sardinia. R. punctum, 
id. ib. ; smooth ; horn coloured ; labrum inwardly slightly thickened ; 
peristome complete ; allied to the R. ptinctidum, Phil. : coasts of the 
Peninsula, Sant Antioco. R. ohtusa, id. ib.; obtuse; smooth; horn coloured, 
yellow ; three whorls ; suture deep ; peristome complete : Sardinia ; rare. 
R. sabulum, id. ib. ; obtuse ; sub-umbilicated ; smooth ; horn coloured, 
grey ; apex brown ; four whorls ; mouth roundish, marginated ; peristome 
complete : Sardinia. R. castanea, scrohiculata, globulus, Moller, 1. c. 
from Greenland. R. caribcea, auberiana, gradata, D’Orbigny. 
Rissoina catesbyana, sagraiana, elegantissima, stnato-costata, 
browniana, sloaniana, D’Orbigny : from Cuba. 
Truncatella scalariformis, Reeve, from the Pacific. (Proc. Zool. 
Soc. p. 197.) 
Ampullaria tasmanice, Le Guillou (Rev. Zool. 1842, p. 105) ; coni- 
cal ; five whorls ; slightly striped ; bay, with brown interrupted cross 
lines ; umbilicus deep; 15 mill. : Van Diemen’s Land. 
Turritella lactea, Moller, 1. c. ; white ; thirteen wavy ribbed whorls. 
T. polaris, Beck, ib. ; grey violet, with twelve rounded, four cornered, 
smooth whorls. T. costulata ; white, with twelve to fourteen cylin- 
drical sharp ribbed whorls. T. caribcea, D’Orb., slightly undulated ; 
whitish ; twelve whorls ; from Cuba. 
Scalaria Eschrichtii, Holb., in Moller, 1. c. ; ten fine longitudinally 
striped whorls, the inferior quite smooth. Sc. hotessieriana, D’Orb., 
ten flat ribs ; eight whorls ; the last anteriorly furrowed across : Gua- 
daloupe. Sc. albida, id. ; narrow, oblique, leaf-like ribs ; nine whorls. 
Sc. foliaceicosta, id. ; high, posteriorly widened lamellae ; eleven whorls. 
Sc. echinaticosta, id. ; undulating, four-bristled lamellae. Sc. uncina- 
ticosta, id. ; rose-coloured, with high ribs, hooked posteriorly. Sc. can- 
deana, id., is perhaps Sc. acuta, Pfr. Archiv. 1840, i. p. 256. 
Lea describes a new species of the genus Pasithea, which he calls 
sordida (Sillim. Amer. Journ. xlii. p. 110). Adams declares it (ib. 
p. 392) to be a variety of Odostomia trijida, Gould ; Actoeon trijidus, 
Totten. He also remarks, that it is not from Boston, as Lea asserts, but 
from Dartmouth. 
Actceon parvus. Lea, ib. p. Ill ; acutely conical, smooth, white, um- 
bilicated, columella with one fold : Delaware Bay. 
Lovell Reeve has published a monograph of the genus TornateUa, in 
which he reckons thirteen species ; amo)ig these, seven are new. (Proc. 
Zool. Soc. 1842, p. 58.) 
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