10 FAUNA OF NEW ENGLAND. 



HYDRACHNIDAE. 



Hydrachna globaior Miiller, Zool. Danicae prodr, 1776, p. 188. 

 " Denmark." 



]\Iass. — Wood's Hole. 



41. Arrenurus parallellatus Marshall. 



. Marshall, Trans. Wis. acad., 1903, vol. 14, p. 154, pi. 16, fig. 18, 

 pi. 18, fig. 6. "Wood's Hole, Mass." 



INIass.— Wood's Hole. 



42. Arrenurus securiformis Piersig. 



Piersig, Zool. anz., 1894, vol. 17, p. 378. "Germany." ^Marshall, 

 Trans. Wis. acad., 1903. vol. 14, p. 152, pi. 18, fig. 4. 



Mass.— Wood's Hole. 



43. KOENIKEA CONCAVA Wolcott. 



Wolcott, Trans. Amer. micros, soc, 1900, vol. 21, p. 190, pi. 11, 

 fig. 15-22. "Lake Saint Clair, Michigan * * * Susan and 

 '26' Lakes, Northern Michigan * * * Reed's, Fisk's, Lam- 

 BERTON, Power's, and Dean's Lakes, near Grand Rapids. 

 Michigan." 



]\iASS. — Cranberry Lake, Wood's Hole. 



44. PlONA DEBILIS (Wolcott). 



Curvipes debilis Wolcott, Trans. Amer. INIicros. soc, 1902, vol. 

 23, p. 234, pi. 32, fig. 44-46. "Cranberry Lake, Wood's Hole, 



Mass." 



Mass. — Cranberry Lake, Wood's Hole. 



