l8o UNIVERSITY OF COLORADO STUDIES 



Lymnaea bulimoides cockerelli Pils. & Fer. 



Pool southeast of Denver, Pilsbry & Ferriss 45, 162. 



Lymnaea bulimoides techella Hald. 



A few specimens were collected at Florence by Prof. E. A. Kenyon. 



Lymnaea palustris Miill. Fig. 37. 



Between Animas and LaPlata, Ingersoll 35, 406. Georgetown, 

 South Park, Twin Lakes, Saguache and Loma, Yarrow 68, 942, 943. 

 ■ Lymnaa Decollated form, pond near Black Lake, Cockerell Mss. 



Limnaa nuttalliana Lea. Between Animas and LaPlata Rivers, 

 Ingersoll 35, 406. 

 This variable species has been described under several different names. There are slight 

 differences in specimens from different lakes, which would afford an interesting study. 

 We have found none in the streams of this region, but have found it common in lakes 

 of both plains and mountains up to 8,500 feet in Boulder, Weld, and Larimer Counties. 

 It has also been collected by Mr. D. M. Andrews at Magnolia and by Prof. F. H. Hop- 

 kins at Meeker, and specimens sent by Prof. E. Bethel are believed to have been collected 

 by Dr. T. W. Stanton at Del Norte. Prof. Cockerell mentions (Mss.) some forms from 

 Greeley resembling forms described from Europe. Specimens from a lake near Ward 

 were called L. palustris haydeni by Dr. Pilsbry and "a pathologic form of palustris^' by 

 Mr. Baker, who considers haydeni probably a synonym. 



L3^nsea palustris elodes Say. 



Chalk Creek, Chaffee County (Cockerell), Baker Mss. 



Lymnaea simiassi Baird. Fig. 38. 



Between Animas and LaPlata, Ingersoll 35, 405. 



We found specimens in some numbers at the head of Lake 



Fig. 38.— Lymnaa George and in the pool just below the outlet, which Mr Baker 

 sumassi. , , . . , , , ■ , 1 1 rxAi 



refers to this species, but none anywhere else in the lake. Ihe 



writer feels much inclined to call them palustris, as does Mr. Walker also, in the 



absence of an oppwrtunity to compare them with the types of sumassi. 



Lymnaea leai Baker. 



Between Animas and LaPlata, Frank C. Baker, " Description of new species of 

 Lymnaea," The Nautilus, Vol. XX, March, 1907, p. 125-127. In Mr. Baker's paper, 

 received since our bibliography accompanying the first part of this paper was printed and 

 consequently not appearing therein, he says: "Easily recognized by its short spire, very 

 large aperture and heavy columellar plait It has probably been heretofore identi- 

 fied as a form of the protean species palustris, but it is unquestionably distinct from any 

 form of that species." 



Lymnaea caperata Say. Fig. 39. 



Its habitat in this region appears to be overflow ditches and 



sloughs which are dry during part of the year. We have collected it 

 caperata. from Boulder to Loveland and have received specimens collected by 



Prof. E. Bethel at Granby, by Prof. E. A. Kenyon at Florence, 

 by Mr. S. R. Rohwer at Florissant, by Mr. H. W. Clatworthy at Ft. Morgan, by Miss 



