578 
ZOOLOeiCAl^ T4TERATURE. 
Siam, yax% Japonicus, from YpJiohamaj PI, ton^anensis (Quoy & Gaimard), 
Lake of Tondano in Northern Oejehes, redescribed j PI. aherram, sp. n., 
Shanghai; PI. umhilicalis (Bens,) and largillierti (Bunker), both from China, 
redescribed ; PL (Segmentmd) calathua (Bens.), Yokohama, described by v. 
Martens, Mai, Blatt. xiv. pp, 212-218. 
Planorhis. The North- American species are classified by Binney (Land- 
nnd Freshwater Moll, i. pp. 103-187) in the following manner ; — 
a. Suhgeniis Planorhis ; subcrenatus (Carp,), lentus (Say), tupiidus (Pfr.), 
glahratus (Say), lumens (Carp.), hapanensis (Pfr.), liebmanni (Bunker). 
b. Suhgenus Planorbella : campanulatus (Say), haldernani (Bunker), 
c. Subgenus Adtda ; midtivolvis (Case), 
d. Suhgenus Ilelisoma ; ammoo (Gould), tenuis (Phil.), corpulentus (Say), 
trivolpis (Say), tnmcatus (Miles), fragilis (Bekay), lautus (II. Adams), 
bicarinaUis (Say), antrorsus (Conrad). 
Q. Suhgenus Menetus : opercularis (Gould), exacutus (Say), 
f, Suhgenus Oyraulus : vermmdaris (Gould), deflecius (Say), dilatatus 
(Gould), albus (MUll,), (Say), arcticus (Beck). 
Genus Segmentina: S. tcheallcyi (Lea) and S, armigera (Say). 
% Carinifex newberryi (Lea) is said to he a distinct genus between Pompholyx 
and Physa. Nothing hut the shell is known, Binney, 1. c. p. 74, with a 
woodcut. 
Bidla Jiuviatilis (Say) and Physa planorbula (Bekay) are very young Pla- 
norbis Irivolvis, L o. p, 118. 
Ancylus. The organization of this genus, the natural affinities of which 
were for a long time not clearly understood on account of the form of the 
shell, is nearly the same as that of Limncea and other aquatic Pulmonata ; 
but it remains in a sort of embryonic state. This is also confirmed by the 
sexual organs, which, on the whole, agree with those of Limn(ea, hut 
exhibit two striking peculiarities : — first, the absence of a distinct albuminous 
gland, the functions of which are performed by the walls of the hermaphro- 
ditic gland itself ; and, secondly, the quite distinct orifice of the muciparous 
glands near to, and not in, the cloaca. Eggs are to ho found during the whole 
summer. Their development is generally the same as that of other Pul- 
monata, without a striking metamorphosis. It wants, like other aquatic 
Pulmonata, the primordial kidney and contractile vesicle occurring in the 
young states of terrestrial Pulmonata, Stepanoff) M^m. Acad. Sc. St. 
P^tersb. X. no. 8, with 2 plates. 
Ancylus isseli, sp. n., Bourguignat, Moll. Nouv. fasc. vii. 1866, p. 214, pi. 33. 
figs. 18-18, Bamhe, near Alexandria. 
Ancylus obscurus (IIaldem.),/xfsqw (Adams), elatior (Anthony), diaphanus 
(Ilaldeman), haldernani (Bourg.), sullei par allelus (Ilaldem.), rivu~ 
laris (Say), iardus (Say), calcarius (Bekay), patelloides (Lea), kootaniensis 
(Baird), caurinus (Coop.), newberryi (Lea), crassus (Haldem.),/ra^^7/s (Try on), 
jilosus (Conrad), and borealis (Morse), Aeroloxus nuttallii (Lea) and ovalis 
(Morse), Gundlachia californica (Howell) and meekiana (Stimps.) are North- 
Amevican species, briefly described and figured by Binney, 1. c. pp. 138-160 
and 156. 
Ancylus kootaniensis, sp. n., Baird in Lord’s Naturalist in Vancouver 
island, ii. p. 864, Bivers Kootanie and Spokan, British Columbia. 
