ISOPODS OF THE ATLANTIC COAST— RICHARDSON. 



543 



107. ERICHSONELLA ATTENUATA (Harger). 



Erichmnia attenimla Hakgek, Report U. S. Commissioner of Fish and Fisheries, 

 1874, Pt. 1, p. 570 (276), pi. vi, fig. 27; Proc. U. 8. Nat. Mas., II, 1879, p. 160.— 

 N'errill, Report IT. S. Commissioner of Fish and Fisheries, 1874, Pt. 1, p. 

 370 (76). — Harger, Report U. S. Commissioner of Fisli and Fisheries, 1880, 

 Pt. 6, pp. 356, 357, pis. vi, vii, figs. 36-37. 



Ilahitat. — Great Egg Harbor, New Jersey; Noank, Connecticut. 



108. ERICHSONELLA FILIFORMIS (Say). 



Sfe7iosoma filiform If! Say, Jour. Acad. Nat. Sci., I, 1818, p. 424. — Milne-Edwards, 



Hist. Nat. des Crust., Ill, 1840, p. 134. 

 Idoim filiform is White, List Crust. Brit. Mus., 1847, p. 95. 

 EricIiso7iiafil form is Hauger, Report U. S. Commissioner of Fish and Fisheries, 



1874, Pt. "1, p. 570 (276), pi. vi, fig. 26; Proc. V. S. Nat. Mus., 1879, II, p. 160.— 



Verrill, Report U. S. Commissioner of Fish and Fisheries, 1874, Pt. 1 , p. 



316 (22). — Hakger, Report U. S. Commissioner of Fish and Fisheries, 1880, 



Pt. 6, pp. 355, 356, pi. vii, figs. 38-41. 



IlaliHat. — Great Egg Harbor, New Jerse3^; Long Island Sound; 

 Vineyard Sound, Massachusetts; Punta Rassa, Florida. 

 Dejjth.—^^ to 7 fathoms. 



109. ERICHSONELLA FLORIDANA Benedict, new species.' 



The hocly is long and narrow, broadest at the third and fourth seg- 

 ments. The head is wider than long. A rectangular projection 

 extends forward in front of the eyes. The 

 frontal margin Ijetween the projections is 

 arcuate. The eyes are lateral, slightly pro- 

 jecting. The antennas are geniculate. The 

 three distal segments are approximately the 

 same length. The terminal segment or tla- 

 gellum is hair3\ 



A large tridentate spine occupies the 

 center of the head. The main portion of the 

 spine has a longitudinally compressed apex, 

 the lateral portions arise at a distance from 

 the base and point divergenth" forward, fall- 

 ing short of the elevation of the main portion. 



The third and fourth segments of the thorax 

 are the longest and widest; the posterior seg- 

 ments are successively shorter. The lateral 

 margins of the segments are concave, making 

 the segmental angles acute. The epimera are 

 exposed in the concave margins. On the 

 posterior margin of each segment at the median line is a single spine 

 pointing backward. On the first four segments there are single lateral 



21.— ERICHSONELLA 

 DANA. 



^The description that follows is from Dr. Benedict's manuscript. 



