214 THE CHICAGO ACADEMY OF SCIENCES. 



Dr. Dall (Alaska Mollusks, p. 78) suggests the identity of ade- 

 lince and bulimoidcs. An examination of the types of both species 

 shows that Dall was right in thus associating the two forms. Tryon's 

 types show a wide range of variation, principally in the form of the 

 body whorl, which may be regularly ovate or somewhat widely ex- 

 panded (compare the figures on plate XXVII). The figures of both 

 forms have been very poor, and the descriptions have been totally 

 inadequate. Tryon's figure in continuation of Haldeman's monograph 

 is of an extremely wide specimen, scarcely to be considered as typical. 

 Many specimens vary toward techclla, the inner lip being wider and 

 the umbilical chink more widely open. Adelines (^bulimoides) has 

 frequently been confounded with gabbi, but that species is almost im- 

 perforate, has a columellar plait and belongs to a different group of 

 Lymnseas. 



Galba bulimoides techella (Haldeman). Plate XXVII, figures 

 30-35; plate XXVIII, figures 1-3, 8. 



Limncea techclla HALDEMAN, Amer. Journ. Conch., Ill, p. 194, pi. 6, fig. 4, 

 1867. TRYON, Con. Hald. Mon., p. 112 (86), pi. 18, fig. 9, 1872. PILSBRY, Proc. 

 Phil. Acad., 1891, p. 320. 



Lymntea techella? FERRISS, Nautilus, XX, p. 17, 1906. BAKER, Nautilus, 

 XXIII, p. 94. HANNA, 1. c., p. 96, 1909. 



Lymnaa bulimoides techclla PILSBRY and FERRISS, Proc. Phil. Acad., 1906, 

 p. 163, figs. 20-23. HENDERSON, Univ. Col. Studies, IV, pp. 81, 83, 93, 180, 1907. 

 WALKER, Nautilus, XX, p. 108, 1907. STRECKER, Nautilus, XXII, p. 65, 1908. 

 HENDERSON, Nautilus, XXIII, p. 144, 1910. 



Limncea bulimoides SINGLEY, Rep. Geol. Surv. Tex., IV, pp. 188, 1892; p. 

 313, 1893. DALL, Proc. Nat. Mus., XIX, p. 368, 1897. And of authors generally. 



Lymncea caperata HINKLEY, Nautilus, XX, p. 40, 1906. 



SHELL: Varying from obtuse to subfusiform; periostracum yel- 

 lowish in color ; surface dull to shining, growth lines rather coarse, with 

 but faint indications of spiral lines ; the body whorl is frequently mal- 

 leated, "the flattened facets obliquely descending;" nuclear whorls 

 \ l /\ wide and low, with a surface sculpture resembling satin finish 

 (pi. XLIX, fig. C) ; whorls six, convex, usually somewhat shouldered; 

 last whorl large, generally very ventricose; spire acutely conic, of 

 variable length ; sutures well impressed ; aperture roundly ovate, from 

 1/2 to 3/5 the length of the entire shell; inner lip broadly and flatly 

 expanded and reflected, without a fold; the anterior extremity of the 

 aperture is produced or effuse; umbilical chink large, rather widely 

 open; outer lip simple, sharp; axis consisting of a series of smooth, 

 round, hour-glass-shaped columns. 



