THE MOLLUSC A OF COLORADO 1 79 



collected by Prof. Bethel; from Florissant, collected by S. R. Rohwer, and alcoholic 

 specimens from Monon, collected by E. R. Warren. Some specimens from Davidson's 

 ranch have a decidedly reddish tinge. ' 



Succinea rusticana Gld. Fig. 30. 



Hot Sulphur Springs, IngersoU 35, 399. 



Fig. 31. — Suc- 

 cinea stretchiana. 



Succinea stretchiana Bland. Fig. 31. 



Large specimens, Pagosa, Yarrow 68, 936. 



Form major Anc. Mss. Pagosa, Cockerell 25, 31. 



Specimens "doubtfully referred to 5. stretchiana Bland," Chaffee 

 County, Cockerell 22, 63; but see 26, 46. 



Genus LYMN.^A Lamarck 



Lymnsea stagnalis appressa Say. 



LimncRa stagnalis Lin. Between Animas and LaPlata, IngersoU 35, 405. Rio 

 Grande, Loma and Del Norte, Yarrow 68, 941, 942. 



Ljrmnaea parva Lea. Fig. 32. 



1 Howardsville (IngersoU), South Park (Wolf), Swift Creek, Custer 



Fig. 32. — ^Lym- County (Walker), Baker Mss. 

 naea parva. 



/-^^^ Lymnaea humilis Say. Fig. 33. 



^v? Denver and South Park, Yarrow 68, 945. San Luis Valley and 

 nsa'humilis ' Howardsville, IngersoU 35, 406. Denver, Surface Creek and subfossil 

 at West Cliff, Cockerell Mss. 

 Limncea truncatula. West Cliff, Cockerell 14, 9. Abundant in Custer County, 

 Cockerell 22, 63. 



A specimen collected by Prof. Cockerell at Lake George we refer to this species. 



^^^^ Lymnaea obrussa Say. Fig. 34. 



V_^*>— -^ Trinidad ( Ashmun), Greeley (Shimek), Baker Mss . 



FiG.34.— Lym- LimncBa desidiosa Say. Hot Sulphur Springs and Blue River 



naa obrussa. Valley, IngersoU 35, 406. Trout Creek, Yarrow 68, 944. Greeley, 



CockereU Mss. 



Abundant in overflow ditches at Boulder, associated with L. caperata. A few were 

 coUected at Florence by Prof. E. A. Kenyon. 



\^^^ Lymnaea obrussa modicella Say. Fig. 35. 



Fig. 35. — L. ob- LimncBa modicella Lea. CoUected in Lodge Pole Creek by 



russa modiceUa. Chas. T. Simpson, CockereU 22, 61. 



Lymnaea bulimoides Lea. Fig. 36. 



Variety at Denver, IngersoU 37, 132. Probably refers to one of 

 Fig. 36. — Lym- the subspecies foUowing. 

 nasa bulimoides. 



