123 



Camp D : Head of tlie Animas Valley, September 3. 8,100 feet. Southern 

 slope of high sierras. A beautiful region in all respects. This and 

 the four following localities were in the side-trip into the San Juan 

 Valley. 



Camp E : Animas Park, September 4. 6,350 feet. Lower down the river, 

 where the broad bottoms are somewhat cultivated. 



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

 7,000 feet. Half-way we liassed a great pond, surrounded with rushes ; 

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

 of fresh- water life. 



Camp F : Bio La Plata Mining Camp, September 5-8. 7,200 feet. Collec- 

 tions made in dense damp groves of evergreen and deciduous trees. 



Camp K : HovvemoeeiJ, Utah, September 13. 4,500 feet. A low, dry ra- 

 vine some twenty miles into Utah, in a desolate mesa country, named 

 by us Hovvenweep, from two Indian words meaning deserted canon. 

 It furnished only gnarled cedars, sage-brush, and greasewood. The 

 valley must be subject to floods. 



Camp P : Head of Mineral Creeh, September 19. 9,300 feet. The sources 

 of a mountain-torrent draining into Baker's Park. 



Camp 28-29: Saint Marj/s LaJce, Antelope Parle, ^eY)temheT2o. 8,300 feet. 

 A beautiful lake without inlet or outlet, on the eastern side of the park, 

 surrounded by rocky cliffs. ' Inhabited by some peculiar shells and 

 hosts of water-fowl, while its shores are the resort of large herds of 

 antelope. 



Camp 30 : Bio Grande above Pel Norte, September 28. 7,560 feet. The 

 camp was in a low spot by a sluggish stream. 



Camp 32: LaJces, San Luis Valley, Septemher 29. 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 alkaline, 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 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. Yerrill 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 favor- 

 able. 



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

 were certainly seen : two amphipods, Gammarus rohustus. Smith, and 

 Hyallela inermis. Smith, both of which were described in the Report for 

 1873, which inhabited the above springs in great abundance. From the 

 pond mentioned between camps E and F a small crab was brought home, 

 which Prof. S. I. Smith pronounced to be a true marine form, belonging 

 to the Astacidce. That this is a survivor of the period, probably com- 

 paratively recent, when this pond was a salt-water marsh, is supported 

 by the fact that well-preserved fragments of Area shell were found on 

 the muddy shores. 



