INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 555 



EUDORELLA HISPIDA Sars. 

 Loc. cit., p. 80. 



Eare in 30 to 35 fathoms, with the other species mentioned, off the 

 coast of New Jersey, (Sars.) 



AMPHIPODA. 



Orchestia agilis Smith, sp. nov. Plate lY, fig. 14. (p. 314.) 



Male : Antennula not quite reaching the distal extremity of the 

 penultimate segment of the antenna j second and third segments of 

 the peduncle about equal in length, and each slightly longer than the 

 first ; flagellum about as long as the two last segments of the j)eduncle. 

 Antenna less than half as long as the body ; segments of the peduncle 

 stout and swollen, the ultimate longer than the penultimate j flagellum 

 stout, compressed vertically, much shorter than the peduncle, composed 

 of twelve to fifteen segments. Propodus in the second i)air of legs 

 short and thickened laterally, the palmary margin with a small promi- 

 nence on the outer edge of the posterior angle, behind which the tip of 

 the dactylus closes, and along the inner edge, inside the dactylus, with 

 a thin ridge, which is broken by a small notch near the posterior angle, 

 so that the margin when viewed laterally shows a broad lobe next the 

 base of the dactylus and two small, rounded lobes next the posterior 

 angle, the tip of the dactylus resting between the small lobes ; dactylus 

 slender, curved so as to fit closely the palmary margin, and furnished 

 with very minute setae along the prehensile margin. Posterior thoracic 

 legs slightly longer than the preceding; carpus in full-grown specimens 

 short, much swollen, and thickened so as to be nearly cylindrical. 



Female : Carpus and hand in the second pair of legs unarmed j pro- 

 podus short, slightly spatulate in outline, with a pair of minute setae at 

 the base of the dactylus, which is very short, not reaching the extremity 

 of the propodus. 



Length : male, 10-15^""^ ; female, 10-14. 



Bay of Fundy to New Jersey. 



Orchestia palustris Smith, sp. nov. (p. 468.) 



Male: Antennulae reaching slightly beyond the distal extremity of 

 the penultimate segment of the peduncle of the antennae. Antennae 

 less than half as long as the body • peduncle slender ; flagellum slen- 

 der, longer than the peduncle, composed of eighteen to twenty-six seg- 

 ments. Propodus in the second pair of legs nearly oval in outline, the 

 palmary margin spinous, regularly curved to the posterior angle, which 

 projects on the outer edge in a slight, rounded prominence, within which 

 the tip of the dactylus closes ; dactylus slender, curved so as to nearly 

 fit the palmary margin, and furnished with minute setae along the pre. 

 hensile margin. Posterior thoracic legs slightly longer than the pre- 

 ceding ; carpus and propodus both long and slender. 



The female differs from the male as in the last species. 



Length, male, 15-22™°i • female, 12-18"''". 



Cape Cod to New Jersey, and verv likelv farther north and south. 



