100 THE NAUTILUS. 
it has been deemed unnecessary to repeat details of this kind which 
have been published elsewhere. Many species are considered by the 
author to be identical with those of Europe; some of these are 
considered distinct by good authorities, and pending sufficient 
anatomical comparisons, are retained as varieties. A distinction is 
also drawn between “ forms” and “ varieties.” 
LIMACID A. 
Agriolimax campestris var. montanus (Ing.), Grand Co. (Ingersoll), 
Agriolimax Morch presents differences from Limax proper which are 
probably to be considered generic. A. montanus cannot be distin- 
guished from campestris by external characters, and I do not think 
its anatomical ones warrant specific separation. 
A. campestris montanus form castaneus (Ing.) Blue River Valley 
(Ingersoll). Probably only a young example of montanus, and 
certainly no better than a variety. Vide J. of Conch. V, 558. 
A. campestris montanus form typicus Ckll. Custer Co.; Chaffee 
Co.; Saguache Co.; Fremont Co. (Canon City) ; Summit Co.; Eagle 
Co.; Mesa Co.; Gunnison Co. 
A. campestris montanus form intermedius Ckll. Saguache Co. ; 
Fremont Co. (Canon City); Pueblo Co. (Wales Canon) ; Custer Co. 
(Wet Mountain Valley) ; Summit Co.; Mesa Co.; Delta Co, 
A. campestris montanus form tristis Ckll. Lake Co. ; Summit Co. ; 
Delta Co. A few specimens of A. agrestis and Helix nemoralis, from 
Burlington, New Jersey, have been liberated at West Cliff, Custer 
Co. 
Vitrina pellucida var. limpida (Gould). White Earth River 
(Ingersoll) ; Dillon, Summit Co. ; Swift Creek, Custer Co. ; Grand 
Mesa, Mesa Co.; Wales Canon, Pueblo Co.; Cottonwood Guleh, 
Saguache Co.; near Mam Mts., Mesa Co.; West Fork of Surface 
Creek, Delta Co.; South Park (Yarrow). 
V. pfeifferi Newe. Head of Gunnison River (Binney); San 
Juan Co. (Ingersoll); E. Fork Arkansas River, Lake Co.; near 
Cattle Creek, Garfield Co.; near Mam Mts., Mesa Co.; Breckenridge 
(Hy. Prime); Rock Creek, Routt Co.; Fort Garland (Yarrow) ; 
Twin Lakes (Yarrow). 
Hyalina nitida (Mill.) High alpine (Carpenter), needs con- 
firmation. 
Hyalina arborea (Say). San Juan Co. (Ingersoll); Williams 
Canon, Manitou (M. E. Cusack); South Park (Yarrow); Twin 
