80 Moll. 
MOLLUSCA. 
Hazay, tom. cit. p. 167, vol. iv. pi. iv. figs. 7-9, some other varieties, 
pp. 168 & 169, figs. 10-13. 
Limncea peregra (Miill.) is a variety of ovata (Drap.), produced by 
living in water containing much carbonic acid, as can be proved by trans- 
planting the spawn to other waters ; Hazay, JB. mal, Ges. viii. p. 265. 
Limncea peregra var. picta^ in Derbyshire; Milnes, J. of Conch, iii. 
p. 153. 
Limncea peregra var. n. amhigua, Sweden, var. n. stgriaca, Styria, 
var. n. oblita, Southern Bavaria, lagotis var. n. prisca, Sweden, subfossil 
in turf beds, palustris var. n. stenostoma, same locality, and var. n. 
decollata, Tornea ; Westerlund, (Efv. Ak. Forh. 1881, pp. 60 & 61. 
Limncea allainiana, vitrinella^ diaphanella, callista, incomparabilis, 
bouchardiana, physella, eumicra, balatonica^ renoufi^ tualiana, gueretiana, 
udvarica^ colombiana, and callomphala, spp. nn. ; Servain, Hist. mal. 
Balaton, pp. 67-78, Lake Balaton, Hungary. 
Limncea acuminata (Lam.) var. patula (Troschel, 1837), sulcatula 
(Trosch.), amygdalum (Trosch.), chlamys (Bens.), rufescens (Gray), 
mauritiana (Morelet), and gracilior^ var. n., all from Bengal except 
mauritiana from Mauritius, and L. ovalis (Gray) = bulla (Bens.), var. 
prunum^ cerasum and nucleus (Trosch.), also Bengal, L. tigrina (Dohrn), 
Ceilon, L. succinea (Desh.) var. impura (Trosch.), Bengal, L.javanica 
(Hasselt) varr. nn. obesa, intumescens^ ventrosa, all 3 from Java, var. n. 
sub teres, Sumatra and Banka, var. n. Java , and Celebes, and 
var. n. porrecta, Timor, with notes on the distribution of this genus 
in India and the Malayan Archipelago ; E. v. Martens, Conchol. 
MT. i. pp. 75-91, pis. xiv. & xv., Troschel’s type specimens figured, and 
pi. xvi. 
Limncea philippinensis, sp. n., Nevill, J. A. S. B. 1. pt. 2, p. 142, 
Lucban, Luzon ; L. andersoniana and yunnanensis (Nevill), Yunnan, 
figured ; id. 1. c. pi. v. figs. 8 & 9. 
Aplecta bullula, Vera Cruz, and tapanensis, Isthmus of Tehuantepec, 
spp. nn., Crosse & Fischer, J. de Conch xxix. p. 334. 
Physa achaia, sp. n., Westerlund, CEfv. Ak. Forh. 1881, p. 61, Patras. 
Fhysa boucardi, Lake of Mexico, strebeli, Vera Cruz, and tehuante- 
pecensis, Isthmus of Tehuantepec, spp. nn., Crosse & Fischer, 1. c. 
pp. 334 & 335. 
Physa hung erf ordiana, sp. n., Nevill, 1. c. p. 143, Lucban, Luzon. 
Pechaudia, g. n., very near Physa, but dextral, found in the alluvial 
deposits of Cheliff (Algeria?) ; Bourguignat, Monogr. Pechaudia, 1881. 
Planorbis. R. Stearns insists on the shape of the first whorls in the 
large-sized North American species, which resemble more or less dis- 
tinctly those of the genus Physa, and concludes therefrom that the shell 
of Planorbis is sinistral, which is also proved by the sinistral situation of 
the respiratory and genital orifices [and has been admitted long ago by 
European anatomical conchologists, as for example Moqu in-Tan don, 
1855 ; Rec.]. He discusses further the affinities and variations of the 
large-sized species, dividing them into two groups : (1) Whorls rounded, 
P. corneus (L.), guadelupensis (Sow.) &c., and (2) Whorls planulate, 
angulated or carinated, P. corpulentus (Say) ; bicarinatus (Say), &c. 
