J76 
MOLLUSCA. 
opaca (Lam.) from acuta (Drap.) ; Desmars, Cat. Moll. He & Vilaine, 
pp. 56 & 67. 
Physa acuta (Drap.) = suhopaca (Lam.) = nana and ohlonga (Potiez 
& Mich.) = horhonica (Fer.) = canariensis (Bourg.) = seychellana 
(Martens) = dalmatina and biu^chl (Kiist.), Southern Europe and several 
parts of AL’rica ; Jickoli, Ver. L. 0. Ak. xxxvii. pp. 206 & 207. 
Physopsis ahyssluica (Martens), id. 1. c. p. 210, pi. vii. figs. 15 & 16, 
notch in the pillar lip distinct only in the young shell. 
Isadora (Ehrenb.) distinct by jaw andradula from Physa. I. sericina, 
sp. n., schacJcoi, sp. n., forshali (Ehrenb.) = lamellosa (Roth) = 
wahlbergi (Krauss) = scalaris and schrnidti (Dunker) = fischeriana 
(Bourg.) = capillacea, clavulata, semiplicata, turriculata, and apicidata 
(Morelet) = beccarii (Paladilhe), and I. contorta (Mich.) = truncata 
(F^r.) = brocchii (Ehrenb.) = hemprichi (Ehrenb.) = trojnca (Krauss) 
= cyrtonata (Bourg.) = scalata (Merian) ; shell, jaw, and radula 
described ; id. 1. c. p. 194 et seq., pis. iii. figs. 2-4, vii. figs. 11-14 : the first 
two from Abyssinia, the last two from Egypt. 
Physa {Isidora) lirata, sp. n., and brocchii (Ehrenb.) var. n, approxi- 
mans ; Mousson, J. de Conch, xxii. pp. 43 & 42, Lower Mesopotamia. 
Planorbis. C. Westerlund, Mai. Bl. xxiv. pp. 70-82, 98-117, pis. ii.-iv., 
discusses some critical species, and arranges those found in Europe in the 
following manner : — 
I. Coretus (Adaiis.). P. corneus (L.) with varr. banaticus (Lang), 
pi. iii. figs. 4-6, ammenocerus (Westerl.), pi. iii. figs. 1-3, etruscus, 
elophilus, adelosius, mabilUi (Bourg.), dufouri ((xraells). 
II. Tropidiscus (Stein). 
rt, Carinati ; umbilicatus (Mull.) = marginatus (Drap.), with 
varr. catinus (ii.) and subuugulatiis (Phil.) ; carinatus (Mull.) 
with var. disciformis (Jeffr.), nummularis (Morch), turgidus 
(Westerl.), dubius (Hartm,), intermedins (Fer.), and dilatatus 
(Clessin). 
5, Vortices : vortex^ L., pi. iii. figs. 7-9, with varr. compressus 
(Mich.), figs. 10-12, discoides (Reinh.), figs. 13-15, (Westerl.), 
figs. lG-18, poulseni (n.) and discus (Parr.), figs. 19-21 ; P. vorti- 
culus (Trosch.), pi. iii. figs. 22-24, with varr. charteus (Held), 
figs. 25-27, and bavaricus (n.),figs. 28-30. 
c, Spirorbes : septemgyratus (Ziegl.), pi. iii. figs. 31-33, dazuri 
(Morch) = spirorbis (Rossm.), pi. ii. figs. 19-22, spirorbis (L., 
nee Rossm.), pi. iii. figs. 34-36, rotundatus (Poiret) = leuco- 
stoma (Millett) pi. iii. figs. 40-42, with var. gracilis (Credler), 
figs., 43-45. 
III. Bathyomphalus (Ag.) : contortus (L.), with var. dispar (Westerl.). 
IV. Gyraulus (Ag., Hartm.) : albus (Mull.), pi. iv. figs. 1-3, with 
var. hispidus (Drap.), lemniscatus (Hartm.), pi. iv. figs. 4-6, cinctidus, 
(Westerl.), gothicus (Westerl.), figs. 7-9, draparnaldi (Jeffr.), 
figs. 10-12, gredleri (Bielz.), pi. ii. figs. 15-18, rossmcessleri 
(Auersw.), devians (Porro, 1838) = deformis (Hartm., 1844) = 
cavatus (Westerl., 1871), borealis (Lov^n) = rossmcessleri (Wes- 
terl., 1871, 1873), pi. ii.figs. 23, 25, Norway, Lapland, and Finland, 
