GASTROPODA (pDLMONATA) . 
Moll. 51 
Autonoe riparia (Gruppy, 1868) = Auricula pellucens (Menke, 1868), 
according to Lechmere Guppy himself, P. Sc. Ass. Trinidad, 1872. 
Alexia myosotis var. n. hiriarti^ Polin & Berillon, Bull. Soc. Bayonne, 
1875, Biarritz, at the light-house. 
LlMNyEID^E. 
Troschel states, in opposition to Siebold (Zool. Bee. xii. p. 193), that 
there is a limited respiration in the Limnmidm during the winter, and 
that water is not used instead of air for that purpose. SB. Ver. Rheinl. 
1876, p. 82. 
Limncea stagnalis (L.) and palustris (Miill.) ; remarkable varieties 
observed at Hamburg by H. Strebel, Yerh. Yer. Hamb. ii. pp. 267-285, 
pis. i. ' & ii. L. palustris. a white variety found at Southport ; E. 
Collier, Q. J. Conch. 1876, p. 139. Banded varieties of L. palustris and 
auricularia (L.), mentioned by Issel, Bull. mal. Ital. (2) ii. pp. 50 & 51 
[probably due to a slight damage of the periostracum] . 
Limncea peregra (Miill.), different varieties from Lombardy, including 
var. n. apricensis ; Adami, Moll. terr. e. fluv. di Brescia e Bergamo, 
p. 69, pi. i. figs. 20 & 21. Yar. from the Jura chain of Southern Ger- 
many ; Weinland, Weicht. schwab. Alb, p. 97, pi. iv. fig. 7. 
Limncea truncatula (Miill.) var. n. wittlingensis^ 11 mm. long, found in 
a pond which had existed only a few years ; Weinland, 1. c. pp. 17 & 98, 
pi. iv. fig. 6. 
Limncea microcephala (Kiister) ? = ovata (Drap.), var., from Trans- 
caucasia, described by Mousson, J. de Conch, xxiv. pp. 146 & 147. 
Limncea goodwini, sp. n., E. Smith, Q. J. Conch. 1876, p. 125, Japan 
[Probably = pervia (Martens)]. 
Limncea hrevicauda (Sow.), Hanley & Theobald, Conch. Ind. pt. viii. 
pi. clviii. fig. 2, Kashmir. 
Physa (Isidora ?) sibirica, sp. n., Westerlund, Nachr. mal. Ges. 1876, 
p. 100, Yenisei River, 71° N. lat. 
Physa {Aplexa) hypnorum (L.) var. n. polaris, id. ibid., same locality. 
Camptoceras (Bens.), the three known species, figured by Hanley 
& Theobald, Conch. Ind. pt. viii. pi. clviii. figs. 1-6. 
Planorhis (Troschel), P. charteus (Held) = bavaricus (Wester- 
lund), and P. acies (Mhlfld.), critical notes ; and variability of P. vortex 
(L.) and dispar (Westerlund) = contortus (L.) var. ; Clessin, JB. mal. Ges. 
iii. pp. 262-275. 
Planorbis centro-gyratus (Westerlund) — rotundatus (Poiret), var.; 
Gredler, Nachr. mal. Ges. 1876, p. 19. This statement retracted ; id. 
1. c. p. 76. P. vorticulus (Troschel, Clessin) provided with a membran- 
aceous fringe at the keel ; Schepman, tom. cit. p. 107. 
Planorbis crista (L.) var. n. laevigata^ Adami, Moll. terr. e fluv. di 
Brescia e Bergamo, p. 74, Lago di Capolago, Lombardy. P. villce, 
sp. n., id. 1. c. p. 76, pi. i. figs. 14-16, Edolo, Yal Camonica, Lombardy, 
allied to rotundatus (Poir.). 
Planorbis micromphalus (Fuchs), hitherto only known from tertiary 
