PHYSA. 145 



forming' a decided angle with the outline above it. No 

 vestige of an umbilical chink. Ordinary size, half an 

 inch (occasionally nearly three quarters) (Mont.) long; 

 two lines and a half broad. 



A specimen forwarded to us from Ohio as the P. elon- 

 gata of Say (Journ. Ac. N. S. Philad. ii. p. 171) is, except 

 in superior size, precisely identical ; others from Massa- 

 chusetts (Gould, Inv. Mas. p. 214, f. 143) differ only in 

 the volutions being more convex, and of a more olivace- 

 ous cast. 



The animal is of a deep brown, or nearly black hue, 

 with paler tentacles, which are subulate, slightly com- 

 pressed, and not auriculated at their bases. The mantle 

 is simple-edged, and not reflected over the shell. The foot 

 is lanceolate. 



This species, though generally diffused throughout Eng- 

 land and Ireland, is somewhat local, and in Scotland 

 occurs only in the southern and midland districts. 



SPURIOUS. 

 P. RivALis, Maton and Rackett. 



Bulla rivalis, Maton and Rack. Trans. Linn. Soc. vol. viii. p. 126, pi. 4, f. 2. — 

 Mont. Test. Brit. Suppl. p. 97. — Turt. Conch. Diction, p. 26 

 (in part). — Dillw. Recent Shells, vol. i. p. 488. 



Jplexa „ Fleming, Brit. Anim. p. 277. 



Phym „ Turt. Manual Land and F. W. Shells, p. 128, f. 112 (copy from 

 Linn. Trans.). 



Limnea „ Sovverby, Genera Shells, Lim. f. 9.— Reeve, Conch. Syst. vol. ii. 

 pi. 192,f. 9. 



Physa Soverbiana, D'Orbig. H. N. Cuba, Moll. pi. 13, f. 11, 12 (probably). 



Aplexus rivalis. Gray, Manual Land and F. W. Shells, p. 21 (as spurious). 



A West Indian sjyecies, introduced hy Maton hnd RacJcett, as 

 from Hampshire. The P. Antonii of Kiisters " Conchilian 

 Cabinet" (i. sect, 17, p. 12, pi. 2, f. 7, 8 J appears to be most 

 closely allied, if not identical. 



VOL IV. U 



