PHYSA. 



11 



Fig. 128. 



Fig. 129. 



Phi/.<!<i 

 gabhi. 



Physa gabhi. 



Physa gal)!)!, Tkyox. — Shell large, thin, closely striated with the 

 lines of growth ; hody whirl inflated, its upper 

 half flattened, so that the labrum appears angu- 

 lated in the middle ; spire moderate, apex acute, 

 whirls six, convex, with distinct sutures. Color 

 light corneous, very much polished within ; lip 

 margined with red. Length 25, diam. 13 ; of 

 aperture 15, breadth 3 mill. 



Mountain Lake, Cal. : Rev. T. Rowell. Santa 

 Ana River, Los Angelos County, Cal. : Wm. Gabb. 

 My cabinet, and cabinets of Mr. Rowell and Mr. 

 Gabb. 



Several specimens of this fine large species were com- 

 municated to me by my friend Mr. Wm. Gabb, after whom I take great 

 pleasure in naming it. It is a much larger, thinner species than Ph. Jietero- 

 stropha, Say, and is at once distinguislied by the peculiar flattening of the 

 superior portion of the body whirl. The same character will also distin- 

 guish it from Ph. buUata, Gld., in which species the aperture, moreover, is 

 proportionally longer. {Tri/on.) 



Physa gabhi, Tryon, Proc. Phila. Acad. Nat. Sc. 1S63, 149, pi. i. f. 14. 



This is a very well-marked species. Fig. 128 is copied from 

 the original figure of Mr. Tryon, whose description is given above. 

 Another figure also is given. 



Plsysa gyrina, Sat. — Shell heterostrophe, oblong ; whirls five or 

 six, gradually acuminating to an acute apex ; suture slightly 

 impressed ; aperture more thau one-half, but less than two- 

 thirds the length of the shell ; labrum a little thickened on 

 the inner margin. Length rather less than one inch. 



Inhabits waters of the Missouri. 



Of this species I found two specimens at Bowyer Creek, 

 near Council BluflT. It differs from P. hcterostropha in magni- 

 tude, in having a more elongated spire, and less deeply im- 

 pressed suture. (,S(iij.) 



Phijsd giirina, Sat, J. A. N. S. II, 171 (1S21).--Binney's ed. 

 67. — Haldeman, Mon. 32, pi. iii, f. 1-6 (1843).— 

 ?DeK.vy, N. Y. Moll. 79, pi. V, f. 87 (1843).— Ciiemxitz, ed. 2, 20, 

 pi. V, f. 7-10.— Adams, Shells of Vermont, 154 (1842). 



Physa elliptica, Lea, Tr. Am. Phih Soc. V, 115, pi. xix, 83 (1837) ; Obs. 



