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. 
109a. Limnza caperata umbilicata Adams, pl. xxx, fig. 19. 
Limnea umbilicata ADAMS, Amer, Journ. Sci., ed. 1, Vol. XXXIX, 
p. 374, 1840. 
Limne@a cubensis BAKER (non PFR.), Trans. St. Louis Acad. Sci., 
Vol. XI, p. 12, pl. 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- 
Fie. 88. 
Radula of LIMN&A 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; width, 2.75 mill.- (10655.) 
ch G.00e27 S72 <4 00: ‘s % ee 2s 2.00 “  (10655.) 
3 6.7550: 29" 0; x " BOs vit 2.00 ‘* (10492.) 
6 SVR s oe ieee % S 6.00408 3.50 “  (12475.) 
tS TAOO ce oa Es “4 7.00; “ 3.00 “  (12686.) 
Animal: Similar to that of caperata. 
Jaw: As usual, striated. 
Radula formula: 23+43+4+4+4+4+44+34 22(30—1— 30); 
