CRUSTACEA. 113 



PHYLLOPODA. CLADOCERA. 



LYNCEIDAE. 



372. Pleuroxus denticulatus Birge. 



Pleuroxus denticulatus Birge, Trans. Wisconsin acad. sci., 

 1876-77 (1878), vol. 4, p. 96 [20], pi. 1, fig. 21. ''Glacialis, 

 Cambridge, Mass.; Madisox, Wis." 



Mass. — Glacialis, Cambridge. 



373. Pleuroxus hamatus Birge. 



Pleuroxus hamatus Birge, Trans. Wisconsin acad. sci., 1876- 

 77 (1878), vol. 4, p. 98 [22], pi. 2, figs. 13 & 14. "Southamp- 

 ton, Mass." 



Mass. — Southampton. Not rare. 



374. Chydorus sphaericus (O. F. Miiller). 



Lynceus sphaericus O. F. Miiller, Zool. Dan. prod., 1776, p. 

 199. Exact locality not given. 



Chydorus sphaericus Herrick, Twelfth ann. rept. geol. & nat. 

 hist. sm-. Minnesota, 1884, p. 116, pi. F, figs. 4, 7, 8 & 10. 



Common wherever I have collected (Birge). 



[Mas..] 



375. Graptoleberis testudixaria (Fischer). 



Lynceus testudlnarius Fisher, Mem. acad. Imper. sci. St.- 

 Petersbourg par divers savants, 1848, vol. 6, p. 191, pi. 9, fig. 12. 

 " Sergiefskoje bei Peterhof." 



Graptoleberis inermis Birge, Trans. Wisconsin acad. sci., 1876- 

 77 (1878), vol. 4, p. 102 [26], pi. 1, fig. 17. 



Mass.— Cambridge and Southampton. 



376. Aloxa axgulata Birge. 



Alona angulata Birge, Trans. Wisconsin acad. sci., 1876-77 

 (1878), vol. 4, p. 104 [28], pi. 2, fig. 16. "Cambridge, Mass." 



Mass. — Cambridge. Not rare. 



