NO. 1848. RECENT CLADOCERA FROM NEW ENGLAND— DOOLITTLE. 169 



The honeycomb cells are remarkably free from attached algae or 

 protozoa or debris, though some of these are observed at times. 

 C. faviformis Birge, which occurs associated with the form here 

 described, is often loaded with algre and protozoa. 



Occurrence. — Taken frequently but not in numbers fi'om weedy 

 shallow parts of Umbagog Lake, Maine, and New Hampshire, 

 1905, July, August; Sebago Lake, Maine, 1906, 1907, 1908, July, 

 August, September; Panther Pond, Maine, 1906, August; Songo 

 River, Maine, 1906, July; Grover Mill Pond, Princeton, New Jersey, 

 1909, September; 1910, August. 



Tiipe.— Cat. No. 42782, U.S.N.M. 



Type-localit)j. — Sebago Lake, Maine, August 19, 1907. 



EXPLANATION OF PLATES. 



Plate 13. 



Fig. 1. Parophryoxus tubulatus, female from Umbagog Lake, Maine and New Hamp- 

 shire, August, 1906. Lateral view. X58. 



2. Do. Rostrum and Antennule. X233. 



3. Do. Antenna. X233. 



4. Do. Post abdomen. X233. 



Plate 14. 



Fig. 1. Parophryoxus tubulatus, female from Anonymous Pond, Maine, Sejit ember, 

 1908. Lateral view. X58. 



2. Do. Dorsal view. X58. 



3. Do. Anterior view. X58. 



4. Do. First leg. X233. 



5. Do. Second leg. X233. 



6. Do. Third leg. X360. 



Lettering: d, exopodite; e, e' , e" ^ endopodite and its branches; mx, maxillary 

 process. 



Plate 15. 



Fig. 1. Parophryoxus tubulatus, female from Anonymous Pond, Maine, September, 

 1908. Fourth leg. X360. 



2. Do. Fifth leg. X360. 



3. Do. Sixth leg. X360. 



4. Do. Head, lateral view. X133. 



5. Do. Maxilla. X400. 



6. Do. Postabdomen. X133. 



Lettering as under Plate 14. 



Plate 16. 



Fig. 1. Parophryoxus tubulatus, marking of shell, female. X633. 



2. Do. Male from Anonymous Pond, Maine, September, 1908. Lateral view. 



X94. 



3. Do. Anterior view. X133. 



4. Do. Juvenile male. Lateral view. X94. 



5. Do. End of postabdomen, the shrunken tissues showing position of sperm 



duct. X270. 



Plate 17. 



Fig. 1. Chydorus bicornutus, female from Sebago Lake, Maine, July, 1908. Lateral 

 view, antenna not shown. X127. 

 2. Do. Dorsal view. X127. 



