THE NAUTILUS. 35 



barbata Pils. A stiff shower during the night brought them out 

 upon the rocks, and with sycamore shade in plenty they re- 

 mained active during the following forenoon. The teeth upon 

 the lower margin were smaller than at Station 56, lip more 

 rounded, but no other difference of importance was noted. 

 Compared with the former station, one example measured 7.4 

 mm. alt., 15 diam. Smaller examples were found than in the 

 former colony. Two of these measured, alt. 6.2, diam. 13.5 

 mm.; alt. 6.4, diam. 13.4mm. 



Sections 58, 59. Above the cabin, in a branch of the canyon 

 north of east, and in the rocks around and above Cave Spring, 

 were found shells smaller in diameter but otherwise unchanged. 

 Three of this colony measured: 



Height 6. 6, diam. 13.6mm. 



Height 6.8, diam. 12.6 mm. 



Height 6.8, diam. 12.4 mm. 



These stations were at an altitude above 8,000 feet, the high 

 point of the range. The upper two miles of this canyon was 

 left unexplored. 



(To be continued.} 



NOTES 



Mr. Frank C. Baker announces that he has resigned his posi- 

 tion as Curator and Acting Director of the Chicago Academy of 

 Sciences. His address for the summer will be 1555 Highland 

 Avenue, Rochester, N. Y. 



VlVIPARUS MALLEATUS REEVE IN MASSACHUSETTS : In April, 



1914, Mr. William J. Clench brought in two specimens of 

 the above species for determination, collected in Muddy River, 

 a small stream dividing Boston from Brookline. Shortly 

 afterwards a third specimen was found by Mr. Kendall Foster. 

 At the time I was inclined to consider it a recent introduction 

 from some aquarium, as the animals were dead when found and 

 probably killed by the cold, being unable to stand the winter. 

 On Nov. 2, 1914 a fourth specimen was found by Mr. P. S. 

 Remington. On April 1, of this year four specimens were again 



