518 PATAGONIAN EXPEDITIONS I ZOOLOGY. 



the riblets about as wide as their intervals, about 25 in i mm. on the last 

 half of the last whorl. Under the microscope some very minute striations 

 may be seen upon the ribs, and in places an extremely minute and very 

 faint spiral striation. The rotund-lunate aperture is slightly oblique. 



Alt. 0.9, diam. 1.7 mm. (50 miles above Sierra Oveja). 

 " 1.2 " 1.8 mm. (Santa Cruz). 



Santa Cruz (v. Ihering, type locality). Near Mt. of Observation. On 

 the Rio Chico 50 miles above Sierra Oveja, on a dry stone near the water. 

 Spring near base of the Andes, 65 miles north of the Rio Chico, elevation 

 2400 ft. Banks of a small stream 10 miles from Ushe Lake (J. B. Hatcher). 



The above description and the figures are from a shell collected alive 

 50 miles above the Sierra Oveja. The original description, in Portuguese, 

 was based upon fossil specimens, which had lost the color and part of the 

 finer sculpture. The original lot of patagonicus was from Santa Cruz, on 

 the coast, in a modern deposit. Part of the original lot is before me. 

 They are a little larger than the living shell described, with the whorls 

 slightly deeper ; yet in the series examined from all of the localities yet 

 known, the very slight differences seem to intergrade. 



STEPHANODA Albers. 



This group comprises Patuloid species in which the embryonic whorl is 

 typically smooth, but in some forms now referred here it is marked with 

 radial striae, but no spirals. It differs from Amphidoxa (with which I 

 formerly united it) by the more numerous, less rapidly widening whorls. 

 Without a knowledge of the soft parts, the relationships of these South 

 American snails to the Austral Charopa and Flammulina, and to the northern 

 Patuliform genera, cannot be defined. The following species from southern 

 Patagonia belong here : 

 S. lyrata (Gld.), summit of highest mountain near Orange Harbor, etc. 



(Helix lyrata Gld.). 



S. leptotera (Mab. et Rochebr.), Orange Bay (Patula leptotera M. & R.). 

 S. rigophila (Mab. et Rochebr.), Orange Bay (Patula r., M. & R.). 

 S. michaelseni (Strebel), Magellan Strait to Navarin Island (Patula m., 



Strebel, 1907). 



