104 THE NAUTILUS. 



In 1906 we collected a few shells in the neighborhood of Albu 

 querque while waiting for trains. 



The immediate environs of Albuquerque are barren of molluscan 

 life. Only along the Rio Grande the drift debris affords small shells, 

 the land forms probably washed down from the Sandia mountains, 

 which rise north of the city. A low ridge of black volcanic rock 

 frowning on the western horizon proved to be not worth the excur- 

 sion. We found only a few Pitpoides marginatus there. The nearer 

 slopes of the Sandia mountains are also barren. A few small species 

 Were found in the canyon beyond the Agricultural College. A much 

 richer fauna no doubt inhabits the higher slopes northward. Miss 

 Maud Ellis found twelve species in Las Huartus canyon, at 8000- 

 9000 feet elevation (NAUTILUS, xiv, 85). 



The following forms were taken: 



Helicodiscus eigenmanni arizonensis P. & F. Rio Grande drift ; 

 Sandia Mts. 



Vitrea indentata umbilicata Ckll. Sandia Mts. 



Zonitoides arborea (Say). Sandia Mts.; Rio Grande drift debris. 



Zonitoides minuscula (Binn.). Sandia Mts.; Rio Grande drift 

 debris. 



Euconulus fulrus (Miill.). Sandia Mts. 



Vallonia cychphorelJa Anc.. Rio Grande drift debris. 



Cochlicopa lubrica (Miill.). Sandia Mts. 



Pupoides marginatus (Say). Rio Grande drift debris; volcanic 

 ridge about 5 miles west of Albuquerque. 



Pupoides horduceus (Gabb). Rio Grande drift. 



Pupilla blandi Morse. Rio Grande drift. 



Bifidaria procera (Gld.). Rio Grande drift. 

 . Bifidaria procera cristata P. & V. Rio Grande drift. 



Bifidaria peUucida hordeacella (Pils.). Rio Grande drift. 



Bifidaria armifera (Say). Rio Grande drift. 



Vertigo ovata Say. Rio Grande drift. 



Lyrmicea bulimoides cockerelli P. & F. Rio Grande drift. 



Planorbis trivolvis Say. Rio Grande drift. 



Planorbis parvus Say. Rio Grande drift. 



Valvata (humeralis Say ?), one broken specimen. Rio Grande 

 drift. 



