KGERsoLL.] ZOOLOGY LIST OF LOCALITIES. 387 



bottoms, with pleuty of timber on the hills. Clear, with frosty 

 nights. 



Camp 26 : SoicardviUe, Balmr's ParJc, August 29-September 23. 9,700 

 feet. A deep valley among immense trachyte mountains. Abundance 

 of timber (spruce and the like, and aspen), bushes and plants. Frosty 

 nights, and snow toward the last of our stay. 



Cunningham Gulcli is a deep caiion near by, on the high, perpendicular 

 side of which, along trails leading to silver-mines, I found active mol- 

 lusks and insects at an altitude of fully 11,000 feet. 



Camp D: Casm.de Creek; head of the Animas Valley, September 3. 

 About 8,000 feet. Southern slope of high sierras. A beautiful region 

 in all respects. This and the four following localities were on the 

 side-trip into the San Juan Valley. 



CampE: Awiwirts ParA;, September 4. About 6,600 feet. Lower down 

 the river, where the broad bottoms are somewhat cultivated. 



Camp E-F : Between the Rio Animas and Rio La Plata, September 4. 

 8,000 feet. Half-way we passed a great pond, surrounded with rushes; 

 the resort of innumerable wild fowl, and inhabited by a great variety 

 of fresh-water life. Observe the note to Helisoma trivolvis. 



Camp F: Rio La Plata mining-camp, September 5-8. About 7,500 

 fee't. Collections made in dense damp groves of evergreen and de- 

 ciduous trees. 



CA3IpK: Hovvemceep, f7/a/^, September 13. About 4,500 feet. Alow, 

 dry ravine some twenty miles into Utah, in a desolate mesa country, 

 named by us Hovvenweep, from two Indian words meaning deserted 

 canon. Only gnarled cedars, sage-bush, and greasewood grow there. 

 The valley must be subject to floods. 



CA3IP P : Read of Mineral CreeTc, September 19. About 10,000 feet. The 

 sources of a mountain-torrent drainhjg into Baker's Park. 



Camp 28-29 : Saitit Mary's Lake, Antelope Parli, September 25. 9,300 

 feet. A beautiful lake without inlet or outlet, on the northeastern 

 side of the park, surrounded by rocky cliffs. Inhabited by some pe- 

 culiar shells and hosts of water-fowl, while its shores are the resort of 

 large herds of antelope. 



Camp 30 : Rio Grande above Del Norte, September 28. 7,560 feet. The 

 camp was in a low spot by a sluggish stream. 



Camp 32 : Lakes, San Luis Valley, September 20. About 7,500 feet. 

 These lakes are most of them dry in September, and all the shells I 

 found were dead on the beach. They are frequented by innumerable 

 wild geese and ducks, which are tormented by the many large gulls 

 which make the lakes their home. The waters are alkabne, and the 

 whole region is white with saline deposits and nearly barren. . 



It will be observed that all of these localities are in Colorado except 

 Camp K. 



GENERAL ACCOUNT OF THE WORK. 



Attention was chiefly given to fresh-water invertebrate life, though 

 the results were not very satisfactory. 



At the springs near Saguache, leeches were found, pronounced by 

 Prof. A. E. Vernll to be Aulostomum lacustre, var. tigris, Verrill, and 

 Clepsine modesta, Verrill, both of which have been found heretofore in 

 the same region. A more thorough search, had it been possible, would 

 probably have revealed additional forms, as the locality was extremely 

 favorable. 



For Crustacea a sharp lookout was kept, but only the following spe- 

 cies were certainly seen : two amphipods, Qammarus rohustus, Smith, 



