Hannibal: caltfornian freshwatkr mollusca. 187 



Sub-genus Heathilla. Shell similar to preceding but moi-e nearly- 

 globose, sub-perforate, the spire but little elevated, early adolescent 

 whorls slender, but the later ones expanding more rapidly than in 

 Flnminicola., s.s., sutures shallow, Fluminicola stage carried back to 

 mid-adolescence ; habitat similar. 



The bulk of the Fluminicolas belong to Heathilla, which may be 

 readily distinguished by its globose form. Judging by the localized 

 distribution of the representatives of this genus, additional species 

 may be expected when tlie Great Basin and adjacent desert regions 

 are explored more fully. 



Fluminicola viuens (Lea). 

 Ptdndina virens, Lea, 1838; P. nucha. Lea, 1838; P. Nuttalliana^ 

 Lea, 1838; Amnicola Hindsii, Baird, 1863. 

 Shell large, elevated-conic, imperforate, epidermis dark green or 

 tawnv, spire elevated, sutures well impressed ; habitat streams and 

 springs. 



Columbia and Eraser (locally) Systems. 



Fluminicola !^[oDOCI, n.sp. PI. VIII, Fig. 30. 



Shell small, elevated-conic, imperforate, epidermis green-brown, 

 spire decidedly elevated, sutures deeplj' impressed ; habitat springs. 



Altitude (estimated) 5-0, breadth 3-2, altitude of aperture 2-6 mm. 



Nevada System (locally). 



California : Fletcher's spring, south end of Goose Lake (type) ; 

 Fritter's spring, head of Willow Creek, Honey Lake basin ; Troxel's 

 spring. Eagle Lake (H. Hannibal). 



In the new edition of West Coast Shells this distinct little 

 Fluminicola was figured as Anmicola viicrococcus, to which it bears 

 some resemblance, though that llissoid is even more minute and sub- 

 perforate. F. Modoci appeal's to be confined to the lava beds of North- 

 Eastern California and the adjacent portions of Oregon and Nevada, 

 once the home of the Modoc Indians, who, led by the intrepid Captain 

 Jack, for a number of years successfully resisted the settlement of the 

 country by the whites. 



Fluminicola (Heathilla) fusca (Haldeman). 

 Anculosa fnsca, Haldeman, 1841; Anmicola Hurhiniformis, Tryon ', 

 J. G. Cooper, 1871, pars. 

 Shell large, nearly globose, sub-perforate, epidermis dark silvery- 

 brown, spire somewhat elevated, sutures impressed, whorls deep ; 

 habitat streams. 

 Utah System. 

 Quaternary: Bonneville Lake beds, IJtah. 



Fluminicola (Heathilla) seminalis (Hinds). 

 Paludina seminalis, Hinds, 1842; P. ' nude a, Lea', Hinds, 1844; 

 F. ' Nuttalliana, Lea', Binney, 1865,jw«rs; Amnicola tiirbini- 

 formis, Trvon, 1865; F. 'fnsca, Haldeman', Call, \SS4, pars; 

 A. Dalli, Call, 1884. 



