F II Y S A. 



Genus PIIYSA, Draparnaud. 



Testa Jliiri'tli/is, ronua, tenuis, spiralis, sinlstrorsrf, 



■plertniiqiie ovato-iiciiminafa ; labia e.rterno aciita, 



siiiiplii-i ; labia interna expanso, cum roluniella cvn- 



timio ; columella tortua, uniplirata. Operculum 



nullum. 



Shell (luviutiio, horny, thin, spiral, sinistral, gonorally 



ovate acuminated ; outer lip sharp, simple ; inner 



lip expanded, continuous with the columella; 



columella tortuous, single-plaited. Operculum 



none. 



The Physa;, like the other Lynuia-da?, are fnuml in 



ponds, rivers, and fountains. Many of the older spicies 



are North American and many of the newer ones are 



Australian. We have a couple in Great Britain, and 



there are others in other parts of Kurope. South Africa 



and India abound in species, which on the whole seem 



to flourish best in warm countries where ruiming 



streams are to be found. 



trans- 

 'uald; 



Species 1. (Mus. Sowerby.) 



PlIVSA I'ONTIN.iLls. P/(//. testa tenui, H 

 lucidA, pallidefulvd, ovatd ; npird brer 

 aperturd ohliqud, cvlumelld albd, tenui, tarlh 

 plied subprominenti ; labia interna teuui^^iiiia. 



The kount.mn Piiysa. Shell thin, shining, transparei 

 pale fulvous, ovate ; spire short, acuminated ; ape 

 ture oblique, columella white, thin, tortuous, witi 

 rather jjrominent fold ; inner lip very thin. 



Linnaeus (Bulla). Systema Naturce. 



Ilab. Great Britain; France; Europe generally. 

 Mostly found in standing pools and small streai 



near fountains. 



Species 2. (Fig. a, b, Mus. Sowerby.) 

 PuvsA Africana. Phi/, testa ovato-tumidd, solidiilsculd, 

 nitenli, olii}aced,fasciis paucisfuscis longitialinalibus 



ornata ; spira 

 gibbosis ; columella, h, 



anj'ractibus siipierue 

 albd, crassd in anijuluiii 



The Afuicax Pin 



Shell tumid-ovate, rather solid, 



shining, olivaceous, ornamented with a few brown 

 longitudinal bands; spire very short, whorls 

 gibbous above; columella short, white, thick, 

 produced into a tooth-like angle. 



Krauss. Sudafriken Mollusken. 



Phijsopsis Africana, Adams. 



Hab. Cape of Good 11. .pe. 



The prominent tuoth-like angle of the short columella 



i.s so remarkable that it has been supposed by some to 



justify a generic separation. 



Species 3. (Fig. a, b, Mus. Brit.) 



Physa ancili.ai;ia. Pbi/. testa orato-obloiigd, pallide 

 corn,,!, hine-illic fiiscu faseiiitil, spird breviusculd, 

 aufructibiis a/,;e„li/„is pareis, j>: uultiwo ma,jno, 

 ultimo ohivu'jn. jiiKpe siitiiraiii tuiiiido: aperturd 

 ovatd, labia iuterun ralido .- eviumelld torttid, plica 

 vuiderate consjiimd. 



The nA.\D5iAiL> Physa. Shell ovate-oblong, pale 

 horny, here and there banded with brown, spire 

 rather short, apical whorls small, penultimate 

 large, last oblong, tumid near the suture ; aperture 

 ovate, inner lip strong ; cohunella fold tortuous, 

 plait moderately conspicuous. 



Say. Haldeman's Archives, PI. II. f. 1. 



Bab. Pennsylvania. 



Species i. (Fig. a, b, Mus. Sowerby.) 



Physa inflata. Pb;/. tcstd ylobosd, injlatd, brevi, 

 pallidij'iilr.i, ran) fasco fasciatd, spird brevissimd, 

 aiif'riielii ujiieiili uduuto, secundo inflata ; idtimo 

 valde iiijlala; ullrd a.eeiu. producto ; aperturd ro- 

 tunda, ruluuielld areiiatd, jdicd eleratd. 



The inflateii Phvsa. Shell globose, inflated, short, 

 pale fulvous, here and there banded with brown, 

 spire very short, with apical whorl minute, the 

 second intlated, the last much inflated, produced 

 beyond the a.^s; aperture rounded, columella 

 arched, plait raised. 



Adams and An ;as. Proc. Zool. Soc. 



Hub. S. Australia. 



November, 1874. 



