84 LAND AND FRESH-WATER SHELLS OF N. A. [PART IL 



Phijsa mexicana, Philippi in KiisTER, Chemn. ed. 2, p. 5, pi. i, f. 3-4. 



I can give no other information regarding this species tlian that 

 furnished by the original description copied above. One of Kiis- 

 ter's figures also is given. The specimens in the collection no 

 doubt are to be referred to the species. 



Fig. 144. 



Fig. 145. 



Phyfta hetero- 

 stroplui, from 

 Say's type. 



Pliysa laeterostl'Oplia, Sat. — Shell sinistral, subovated ; color 

 pale yellow, chestnut or blackish ; whirls four, the first large, the others 

 very small, terminating rather abruptly in an 

 acute apex ; aperture large, somewhat oval, 

 three-fourths of the length of the shell, or 

 rather more ; within of a pearly lustre, often 

 blackish ; lip a little thickened on the inside, 

 and tinged with dull red. 



Inhabits with the first species (Z. cata- 

 scopium), and almost as numerous. PI. 1, 

 Fig. 6. 



Animal resembles that of Lhnnsea catasco- 

 pium, but is of a darker color and longer than its shell, the 

 tentacula also are longer and setaceous ; tail acute. The mantle is trifid 

 at the base of the pillar lip. and at the upper corner of the aperture ; de- 

 posits eggs the beginning of Xlay ; eggs enveloped by a transparent gelati- 

 nous substance ; the nucleus, after a few days, appears of a pale or milk- 

 white color, and not so well defined as those of L. calascojnum. (Say.) 



Limnasa heterostrnpha, S\Y, Am. ed. Nich. Enc. pi. i, f. 6 (1817, 181S, 

 1819): BixNEY's ed. 46, pi. Ixix, f. 6. 



Phi/sa heterostropha, Say, Jour. Acad. Nat. Sc. II, 172 (1821) : Binney's 

 ed. p. 68.— Haldeman, Mon. p. 23, pi. ii, f. 1-9 (1843).— Godld, 

 Invert, p. 211, f. 141 (1841).— Adams, Shells of Vt. 154 (1842).— 

 DeshayEs in Lam. An. sans Vert. VIII, 402; ed. 2, 111,412. — De- 

 Kay, N. Y. Moll. p. 76, pi. V, f. 82 (1843).— Chemnitz, ed. 2, p. 7, 

 pi. 1, f. 7, 8. — Mrs. Gray, Fig. Moll. An. pi. cccx, f, 9. — Potiez et 

 MicHAPD, Gal. des Moll. I, 224, pi. xxii, f. 15, 16. — Anony^. Canada 

 Nat. II, 209, fig. (1857). 



Phijsafontana, Haldeman, Mon. pt. 2, p. 3 of cover (1841). 



Physa cylindrica, Newcomb in DeKay, N. Y. Moll. 77, pi. v, f. 82 (1843). 



Physa aurea, Lea, Trans. Am. Phil. Soc. VI, 18, pi. xxiii, f. 106 ; Obs. 

 II, 18 (1839).— DeKay, N. Y. Moll. 80, pi. v, f. 89 (1843). 



Physa pUcata, DeKay, N. Y. Moll. p. 78, pi. v, f. 85 (1843). 



