422 



PROCEEDINGS OF THE NATION \l. MUSEl M. 



vol. 38. 



remarkable large falciform serrated claw, which is one-half as long 

 as the antenna. Fifth legs (fig. 16c) of a single long curved seg- 

 ment, with two apical setae. Female with two 

 egg sacs. 



Occurrence. — Collected in surface net at Buzzards 

 Bay, Woods Hole, duly. 



Distribution. British seas (Brady); Liverpool 

 Bay (Thompson); Narragansett Bay (Chariest own 

 Pond), Rhode Island (Williams). 



Fig. 10.— Lichomoi.'.i 



FUCICOLl S. «, SEC- 

 OND ANTENN LOI i 

 M ME; b, ABDOMEN OF 



female; c, f i F I ii 



FOOT. 



Family TACIIIDIIIXF. 

 Genus TACHIDIUS Lilljeborg, 1853. 



TACHIDIUS BREVICORNIS (Miiller). 



Cyclops brevicornis Muller, Zool. Dan. Prodr., 1776, p. 414; Entomostraca, L785, 

 p. 118. 



Tachidius brevicornis Claus, Die Freilebenden Copepoden, L863, p. 112, figs. 1-8. — 

 Brady, Copepoda of the British Islands, vol. 2, 1880, p. 20, figs. 1-16. — 

 Thompson, Trans. Liverpool Biol. Soc, vol. 7, 1893, p. 18, figs. 1-2. 



Length. — About 1.65 mm. 



Characters. — Body robust, with a short rostrum. Body segments 

 fringed on their posterior margins with rows of minute teeth. Fifth 

 pair of feel in both sexes (fig. \7a,b) broad, 

 one-segmented, subquadrate, longer in female 

 than in male. Atypical inhabitant of warm, 

 brackish pools. 



Occurrence. Collected by a birge net from ^^NL^ * 



a brackish pool near Old Mill, Jamaica Bay, fig. 17. tachidius brevicob 

 Long Island, dune. 



Distribution. -British seas (Brady and 

 Thompson); Charlestown Pond, Rhode Island (Williams). 



Family I FY( )PSY FFI D.F. 



FiiNt antennae very short, five-to-six segmented, basal segment 

 greatly dilated. Second antenna' stout, dactyl-like, and destitute of 

 a secondary branch. Mandible small, and bearing a simple bisetose 

 palp. First pair of Feet stout, strongly spined, with an outer branch 

 which is indistinctly two-segmented, and an inner branch which is 

 three-segmented. Second, third, and fourth pairs with both rami 

 three-segmented. Fifth feet plate-like, inconspicuous, and with 

 lobed margins. Abdomen short . and tapering toward the ext remit y : 

 caudal setae commonly distinctly spathulate. 



MS. a, FIFTH FOOT OF FE- 

 MALE; I), FIFTH FOOT OF HALE. 



