540 



PATAGONIAN EXPEDITIONS I ZOOLOGY. 



on a buff ground. In older shells (figs. 16, 17) the pattern is very 

 indistinct or lost by erosion-. 



Fig. 16. Length 21.8, diam. 10, length of aperture 12 mm. 

 " 17. " 18 " 9 " " 10.9 " 



" 19. " 13.1 " 6.9 " " 8 " 



CHILINA FULGURATA ANDICOLA subsp. nov. 



(Plate XLIIIa, Figs. 5, 50.) 



A series of three quite young shells from under stones along a small 

 running stream near the mouth of the Rio Belgrano, and a single shell, 

 perhaps adult, from a spring 50 miles north of the Rio Chico, at an ele- 

 vation of 1750 ft., indicate that a special race inhabits the Andean foot- 

 hills, though the material at hand is hardly sufficient for its full charac- 

 terization. The cuticle is rather bright yellow, with a full development of 

 the fulgurata pattern in young shells. This pattern begins about the 

 middle of the third whorl. 



In the larger shell (PI. XLIIItf, figs. 5, 5<?), from the second locality, the 

 ground is olive or greenish-yellow. The first half of the last whorl has 

 the usual fulgurata streaks, but the last half (following a growth-arrest 

 period) has the streaks broken, leaving four spot-bands. The yellow 

 ground also has many fine olive lines. The aperture is like that of 

 ftilgurata. The apex is eroded. Length 8.5, diam. 5, length of aperture 

 6.8 mm. 



CHILINA FULGURATA HATCHERI subsp. nov. 



(Plate XLIIIa, Figs. 3, 3*.) 



The shell is thin, of a dilute dull red color, variegated with four bands 

 of spots, more or less indistinct, often hardly noticeable. There are also 

 some obscure red-brown longitudinal streaks. The spire is darker, 

 acuminate above, its surface more or less eroded. There would be over 

 5 whorls if the apex were perfect. Surface glossy, with fine growth-lines 

 and very delicate spiral striae, much as in C. fulgurata from 30 miles above 

 Sierra Oveja, but much more delicate. Columella straight and flattened 

 below, acutely folded above, similar to large forms of C. fulgurata. 



Fig. 3. Length 19, diam. 10, length of aperture 13.4 mm. 



17-5 



8.8 



