PILSBRY: non-marine MOLLUSCA of PATAGONIA. 539 



Fig. 18. Length 15, diam. 8, length of aperture 10 



mm. 



" 21, 22. " 12 " 7 " " 8.8 



" 22^-. " 12.5 " 7 " "9 " 



12 " 7.1 " " 8.6 



13-5 " 7-3 " " 9 



" 12.2 " 7.9 " " 9.5 " 



Spring on the north side of the Rio Chico near the Sierra Ventana. 

 Types No. 88,686 A. N. S. P. Also taken in springs 20 and 25 miles below 

 the Sierra Ventana. 



By its shorter form, weak or wanting columellar fold, and the less devel- 

 oped color-pattern, this race differs from C. fulgiirata. Some examples 

 from 25 miles belowthe Sierra Ventana are more fully colored, resembling 

 C.fiilguyata in this respect; and it may be said that dead shells which 

 retain the cuticle also show the color-pattern more distinctly than living 

 shells. 



Chilina fulgurata livida subsp. nov. 



(Plates XLIII, Figs. 5-7; XLIV, Figs. 16, 17, 19.) 



The spire is longer than m fulgurata, acuminate, and consisting of fully 

 dYz whorls ; spiral striae distinct. In the adult stage the surface, where 

 unworn, is livid purplish on the back, and color-streaks are wanting or 

 very weak, though one to three faint spot-bands are generally retained. 

 The eroded spots have the appearance of mould, the edges under a 

 hand-lens, appearing fuzzy or fibrous. The columellar fold is usually well 

 developed, though often appearing weak or blunt in a face view. The 

 interior is dark purplish-brown. 



Fig. 5. Length 20.5, diam. 10.25, length of aperture 12. i mm. 



" 6. " 20 " 10 " " 12 



" 7. " 16 " 8 " " 9.8' " 



23.8 " 12.9 " " 15.4 " 



Spring 15 miles above the Sierra Oveja. Types no. 88,662 A. N. S. P. 



The young stage down to 14 mm. long, is colored like fig. 7, but occa- 

 sional specimens of larger size show some faint, waved color-streaks. ' 



Another lot which I refer to livida (PI. XLIV, figs. 16, 17, 19) was 

 taken in a small stream 5 miles above the Sierra Oveja. The half grown 

 stage (PI. XLIV, fig. 19) is elaborately zigzag-striped with reddish-brown 



' Immature. 



