478 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
3. Ephemeridm. Nymplis of several species, not determined. Most commonly belonging to the 
genus Cmnis ; one example closely allied to Ecdyurua, and undoubtedly of that group by 
Eaton’s Monograph ; another similarly related to Ephemerella. 
4. Phryganeidw. Undetermined larva. 
5. Hydraohnidos, sp. 
6. Allorchestes dentata. Abundant, especially among the vreeds. 
7. Alona, sp. Several times occurring. One allied to A. tuberculata Koch, but probably dis- 
tinct. 
8. Acroperus leucocephalus. Noticed but once. 
9. Eurycercus lamellatus. More abundant. 
10. Ophryoxus gracilis (?) Sars. Examples of a species of this genus not distinguishable from 
gracilis as described by Sars* were obtained among weeds in water 6 to 9 feet deep. This is 
apparently identical with Lyncodaphnia macrothroides Herrick. 
11. Daphnia retrocurva, var. Only a single specimen. 
12. Moina reotirostris. Taken at the margin. 
13. Latona setifera. Three specimens of this somewhat rare crustacean: were taken among 
weeds in water 6 feet deep. 
14. Sida crystallina. Rather abundant in our collections. 
15. Cyclops, sp. Several specimens ; not critically studied. 
16. Epischura lacustris. Only a few examples in one of the hauls at the margin. 
17. Diaptomus sicilis, var. A few specimens among weeds, in water 9 feet deep. 
18. Stylaria lacustris. A single example near the margin. 
19. Ophrydmm, sp. A few colonies of this protozoan taken from the weeds along shore. 
20. Arcella, sp. Taken as above. 
21. Dijjlugia, sp. Taken as above. 
August 5, among the weeds at outlet, 5 p. m., sun, wind. 
1. CMronomus, larvie. Two or three examples. 
2. Agrionina. A single larva of these dragon flies. 
3. Ephemeridw. Several larvae, mostly of the Ephemerella group. (Eaton’s Monograph, PI. 40, 
Fig. 18.) 
4. Hydraclinidce. Four specimens taken. 
5. Allorchestes dentata. Not abundant. 
6. Cyprididce, sp. Several examples, among them representatives of Cypris vidua. 
7. Eurycercus lamellatus. Several specimens. 
8. Simocephalus, sp. A dozen specimens similar to americanus, hnt dili'ering apparently in speci- 
fic characters. 
9. Moina rectirostris. Two examples. 
10. Daphnella hrachyura. Several examples, including young 
11. Sida crystallina. A few. 
12. Cyclops pectinifer Cragin. 
13. Epischura lacustris. A large number of this species, making, in fact, the chief contents of 
the collection. 
14. Diaptomus sicilis, var. A few examples. 
Augusts, upper eud of lake, sandy bottom, with Chara contraria. 
1. CMronomus, larvse. A slender white species. 
2. Ccenis, sp. A single larva. 
3. Allorchestes dentata. Several examples. 
4. Leptodora hyalina. Several examples. 
5. Acroperus leucocephalus. 
6. Ophryoxus gracilis (?). Three examples. 
7. Daphnia retrocurva. A very few. 
8. Latona setifera. A single specimen. 
9. Sida crystallina. Several examples. 
* Oversigt af de Omgegnen af Christiania iagtcagne Crustacea cladocera. Forhandliuger i Videns- 
kabs-Selskabet i Christiania, 1861, p. 158. 
