542 PATAGONIAN EXPEDITIONS: ZOOLOGY. 



CHILINA PERRIERI Mabille. 



Chilina perrieri Jules Mabille, Bull. Soc. Philomathique de Paris (7), 

 VIII, 1883, p. 46; Mabille et Rochebrune, Miss. Sci. du Cap Horn, 

 VI, Pt. H., Mollusques, p. 24, 1889. 



A short, oval, solid form, apparently near C. monticola. Length 12, 

 diam. 8 mm. It has not been figured. 

 Santa Cruz (Lebrun). 



CHILINA MONTICOLA Strebel. 



Chilina monticola Strebel, Zool. Jahrb., XXV, 1907, p. 169, Taf. 8, fig. 



101. 



The shell is thin but rather strong, translucent chestnut, with separated, 

 dilute, waved streaks, or spot bands also, mostly indistinct ; comparatively 

 broad, with short, acute spire of about 5 whorls. Columella has a very 

 weak fold, not visible in front view. 



Length 9.8, diam. 6.9, aperture 8.4 X 3-9 mm. 

 " 8.5 " 6.8 " 7-5X3-2 " 



Punta Arenas, in a large mountain lake at an elevation of about 300 

 meters. 



Strebel seems to entertain some doubt as to whether this may not be 

 an immature stage of C. ovalis Sowerby. I have not seen specimens. 



CHILINA MONTICOLA PILULA subsp. nov. 



(Plate XLIV, Figs. 29, 30, 300.) 



The shell is very small, shortly oval, with a very short conic spire ; 

 thin ; glossy when unworn, sculptured with fine growth-striae and indis- 

 tinct, minute spiral lines. Adult shells are generally dull ashy- or brown- 

 ish-white from loss of the cuticle, but where preserved, it is yellow or 

 dusky reddish, closely marked with indistinct reddish-brown streaks, upon 

 which there are spots at intervals, forming five spiral bands, one just 

 below the suture, the others at subequal intervals on the last whorl. The 

 longitudinal streaks are scarcely visible on some examples, and the spot- 

 bands are often very faint or reduced to three. The very short spire is eroded 

 in all the specimens seen, the number of whorls being therefore uncer- 

 tain. The aperture is quite ample and shows the external color through 

 the thin outer lip. The columella is white, rather narrow and weakly 



