No. 26.] ARTHROSTRACA OF CONNECTICUT. II5 



Color, ofive green with red spots on first four abdominal 

 segments as in Gammarus locusta. 



Length 6 mm. A few specimens from New Haven measured 

 14 mm. 



Distribution : Cape Cod to Florida. Within Connecticut it 

 has been reported from Noank, at the surface and in eel-grass, 

 and from New Haven. 



The species occurs often in brackish water and is common 

 among algse. Two specimens in Peabody Museum were obtained 

 from the branchial cavity of Mya. Smith records this species 

 from the stomach of the tomcod and spotted flounder. 



DEXAMINID^. 



Fifth and sixth segments of abdomen fused. 



First antennse with second joint of peduncle long; without 

 accessory flagellum. 



Mandibles without palp. First maxillse with inner plate 

 having only one or two setae. Second maxillse with inner plate 

 the smaller, and not fringed on inner margin. Maxillipeds with 

 outer plates very long and palp rather short with fourth joint 

 either small or wanting. 



First and second gnathopods feeble, subchelate. Pereiopods 

 with dactyls all commonly pointing backwards. 



Third uropods with rami subequal and extending beyond 

 second pair. Telson elongate, deeply cleft. 



Dexamine Leach. 



Body comparatively stout with some of the segments elevated 

 to strong, dorsal projections. Last two segments of abdomen 

 completely fused. Coxal plates increasing in height to fourth 

 pair; fifth pair much larger than succeeding pairs. 



Antennse very slender; first pair with peduncle much 

 elongated and without accessory flagellum; much longer in the 

 female than the second which, however, in the male is greatly 

 prolonged. 



Mandibles without palps. First maxilla with inner plate very 

 srnall and bearing a single seta apically ; palp uniarticulate though 

 rather large. Maxillipeds with outer plates very large, nearly 

 concealing the comparatively small and slender palps. 



