272 



THE CHICAGO ACADEMY OF SCIENCES. 



moving from one house to another, the eggs became lost, so 

 that he is unable to record any exact observations on the em- 

 bryology of caperata. 



looa. Limnaea caperata umbilicata Adams, pi. xxx, fig. 19. 



Limtuza umbilicata ADAMS, Amer. Journ. Sci., ed. 1, Vol. XXXIX, 



p. 374, 1840. 

 Limnaa cubensis BAKER (non PFR.), Trans. St. Louis Acad. Sci., 



Vol. XI, p. 12, pi. i, fig. 1, 1901. 



Shell: Ovate, solid, translucent; color yellowish or brown- 

 ish horn; surface shining, growth lines fine and numerous; shell 

 encircled by raised spiral lines; whorls five, very convex, the 

 last whorl inflated, occupying from one-half to three-fifths of 

 the total length of the shell; spire short, obtuse; conic, sutures 

 much impressed; aperture roundly ovate, one-half to three- 



FIG. 



Radula of LIMN^EA CAPERATA UMBILICATA Adams. (Original.) c, 

 central tooth; 1-4, lateral teeth; 5, 6, 7, transition teeth; 8, 9, 12, 20, mar- 

 ginal teeth. 



fifths the length of the shell, the terminations rounded; peri- 

 stome thin, sharp, thickened inside by a reddish deposit; 

 columella strong, reflected over the narrowly open umbilicus; 

 columella with a small fold. 



Length, 10.00; width, 5.00; aperture length, 5.50; 



6.00; " 4.00; " " 3.50; 



6.75; " 4.00; " " 4.00; 



" 11.25; " 6.50; " " 6.50; 



" 14.00; " 6.00; " " 7.00; 



Animal: Similar to that of caperata. 

 Jaw: As usual, striated. 

 Radula formula: 



vidth, 2.75 mill. (10655.) 



2.00 " (10655.) 



2.00 " (10492.) 



3.50 " (12475.) 



3.50 " (12686.) 



