536 PATAGONIAN EXPEDITIONS I ZOOLOGY. 



aperture is nearly vertical, very dark chestnut-colored within in adults, 

 less dark in younger shells, fleshy-whitish near the lip-edge, which is thin 

 and acute. The columella is not very wide, flat, white or flesh-tinted, 

 more or less concave, and bears a rather small, very oblique fold above. 

 Parietal callus very thin, transparent. 



Fig. i. Length 41, diam. 22, length of aperture 24 mm. 



" 2. " 30 " 15.3 " " 19 " 



" 3. " 39.5 " 20 " " 22 " 



" 4. " 31.2 " 19 " " 21.8 " 



35.2 " 17.2 " " 21.6 " 



Springs on the Rio Chico, 15-25 miles above the Sierra Oveja. 



This is one of the largest species of the genus, remarkable for its solid, 

 inornate shell, shouldered at the last whorl (a feature not very well shown 

 in the figures), and very dark chestnut or purplish-chestnut interior. Typi- 

 cally the spire is well produced, as in figs, i, 3, but the lot contains also 

 shortened forms, such as fig. 4. 



The shouldered last whorl, solidity and color distinguish this species 

 from C. parchappii d'Orb. It also attains a larger size. Named in honor 

 of Mr. E. A. Smith, to whom we owe a very useful catalogue of the genus. 



Young shells up to 22 mm. long show faint traces of waved longitudinal 

 brown streaks on the last whorl, but in older ones these disappear, though 

 faintly indicated spot-bands may persist up to 30 mm. long in some 

 examples. Figures 8, 9, 10 of Plate XLIII represent young shells 17.2, 

 1 6 and 14.5 mm. long respectively. At this stage there are 5^ to 6 

 whorls. The spire is acuminate and the apex perfect in some individuals. 

 On a yellow ground there are chestnut streaks, which show three (figs. 8, 

 9) or four (fig. 10) forwardly projecting angles, with a row of spots just 

 below the suture. 1 



CHILINA LEBRUNI Mabille. 



Chilina lebruni Jules Mabille, Bulletin Soc. Philomathique de Paris, 7 

 Serie, VIII, 1883, p. 45 ; Mabille et Rochebrune, Mission Scientifique 

 du Cap Horn, VI, Zoologie, Pt. H., Mollusques, p. 22, 1889. 

 An unfigured form, probably related to C. fulgurata. Length 10 to 13 

 mm., diam. 6 to 9 mm. 

 Santa Cruz (Lebrun). 



1 The pattern is not very well rendered in the drawings, and the outlines of the markings are 

 too definite. 



