330 THE CHICAGO ACADEMY OF SCIENCES. 







race which seems reasonably distinct from clodes and which is an 

 abundant mollusk in certain localities. 



Galba elodes shurtleffi (Tryon). Plate XXXIV, figure 13. 



Limncea (Limnophysa) shurtleffi TRYON, Amer. Journ. Conch., II, p. Ill, 

 pi. 10, figs. 4, 5, 1866. 



Limncea shurtleffi TRYON, Con. Hald. Mon., p. 98 (72), pi. 17, figs. 7, 8, 

 1872. 



Lymncea shurtleffi BAKER, Amer. Nat., XL, p. 331, et sq., fig. 4, 1906. 



SHELL: Ovate, cylindrical, robust; periostracum yellowish horn, 

 surface shining, growth lines heavy, coarse, close-set, crossed by fine 

 impressed spiral lines; whorls 5 to 6, flatly convex, the last subcylin- 

 drical and considerably compressed or flattened on the sides; spire 

 depressed, though more elevated in some specimens, acutely conical; 

 nuclear whorls brown, smooth, in outline like those of palustris; sutures 

 impressed, bordered by a rather heavy white callus ; aperture elongate- 

 ovate, contracted, somewhat ear-shaped ; outer lip thickened within and 

 bordered by a purplish band; columella with a heavy callus, which is 

 reflected so as to nearly cover the umbilicus, leaving a small chink; 

 axis slightly twisted. 



Length. Width. Aperture length. Width. 



13.50 6.50 7.00 3.00 mill. (Tryon's type, figured in 



this monograph. No. 

 58160 Acad. Coll.) 



20.00 9.00 10.00 4.75 " (Tryon's fig. 7 in Hald.) 



19.50 8.50 10.00 4.50 " (Part of type lot, Smith. 



Inst) 



TYPES: Academy of Natural Sciences, Philadelphia, two speci- 

 mens, No. 58160. 



TYPE LOCALITY: Weatogue, Conn. 



ANIMAL, JAW, RADULA and GENITALIA : Unknown. 



RANGE (Figure 36) : Connecticut. 



RECORDS. 



Weatogue, Hartford Co., Conn. (Shurtleff; Lea; Tryon). 



GEOLOGICAL RANGE : Unknown. 



ECOLOGY : In artificial pond. 



REMARKS : Shurtleffi is a form of elodes in which the upper spire 

 whorls are shortened and the body and aperture are compressed. The 

 specimens in Philadelphia and Washington are wonderfully uniform. 

 This Lymnsea was found under rather peculiar circumstances, seeming 

 to be a case of mutation, as outlined by de Vries, and the account given 

 by Tryon and Shurtleff is not without interest, and is certainly very 



