AMPHIPODA 



371 



Family 7. AMPHITHOIDAE. 



First antennae with or without secondary flaj^elhim and about the 

 same length as the second; gnathopods large, the second being larger 

 than the first; last pair of ab- 

 dominal appendages end in 

 hooks: about 6 genera and 30 

 species. 



Amphithoe Leach. First 

 antennae without secondary flagel- 

 lum; head without rostrum; man- 

 dible with palp: 17 species. 



A. valida S. I. Smith (Fig. 

 586). Antennae of about equal length and less than half as long as 

 body: New Jersey and Long Island Sound under rocks and among 

 seaweed. 



A. longimana Smith. First antennae as long as the body; gnathopods 



stout and elongate; length 9 mm.: 

 common; Cape Cod to New Jersey, 

 among eel-grass. 



Family 8. COEOPHIIDAE. 



Fig. 586 — Amphithoe valida (Paulmeier). 



Fig, 587 — Corophium cyJindricum 

 (Paulmeier). 



Body depressed 



small; first antennae 



secondary flagellum; 



very large: about 11 



species ; tube-dwelling. 



1. Corophium Latreille. Mandibular palp two- 

 jointed; no secondary flagellum; second antennae enor- 

 mously developed in the male; gnathopods feeble: 12 

 species. 



C. cylindricum (Say) (Fig. 587). Length 5 mm.; 

 color light, sometimes with spots: Maine to New 

 Jersey, living free or in tubes in the mud or in 

 sponges, etc. 



2. Unicola Say. Body depressed; first antennae 

 with secondary flagellum and a little longer than the 

 second; telson lamellar, rounded: 8 species. 



U. irrorata Say (Fig. 588). Color red, mottled 

 with white; length 15 mm.; body broad; rostrum dis- 

 tinct: Labrador to New Jersey; common on sandy or 

 living in tubes, often not of its own construction. 



and abdomen 

 with or without 

 second antennae 



genera and 45 



Fig. 588 



Unicola irrorata 



(Paulmeier). 



rocky bottoms, 



