MARINE INVERTEBRATA OF GRAND MANAN. 41 



ASELEiOlSE^, St., n. g. 



Body loosely articulated as in Asellus. Abdomen uniarticulate, with two long- 

 bifid caudal styles. External pair of natatory feet having each two laminas like 

 the others, but broader and hardened so as to perform the office of an operculum. 

 External antennae longer than the body, and terminating in very long multiarticu- 

 late flagella. Internal antennge minute, with flagella of few articulations, each of 

 which bears a very long hair-like appendage. Legs nearly as long as the body, with 

 the terminal article in each bearing two or more minute unguiform spines at its 

 extremity. In the first pair, the last two articles form a large subcheliform hand. 



The very long external antennas and legs call to mind the genus Munna of 

 Kroyer, in which, however, the caudal appendages are rudimentary. 



A. ALTA, St., n. s.. Fig. 30. Body suboblong; head with its anterior angles 

 produced, and with a prominent sharp rostrum, which is almost erect and curves 

 forward at its summit ; internal antennte very short and slender, with long hairs, 

 which are numerous at the extremities ; externals with an articulated scale or spine 

 on its second segment exteriorly ; outer edges of the dorsal segments produced at 

 their anterior angles, and each having one or two deep emarginations latei-ally. 

 Abdominal segment subquadrangular, a little broader anteriorly, minutely ser- 

 rated on its lateral margins, and undulated at its posterior margin. Color pale 

 whitish, with numerous black pigment spots somewhat regularly arranged above. 

 Antennae and feet white. Eyes large, black. Length, 0.27 in. ; breadth, 0.1 in. 

 Dredged in soft mud in 40 f , ofi" Long Island, G. M. 



JEiGrA. POLITA, St., n. s. Elongated, very convex, so that the sides of the back 

 are perpendicular, and a little incurved below; head subtrapezoidal, broadest before; 

 at its anterior corners are the rather small but prominent black eyes, which are 

 elongate-trapezoidal in shape, narrowest anteriorly. Antennae small but rather 

 stout at base, placed transversely, curving backward, the superior ones being three- 

 fifths as long as the inferior ones, which reach the middle of the first thoracic seg- 

 ment at its lower edge. Feet long, compressed, hairy on their edges, with their 

 second and third articles produced at the outer angles. The epimera in the first 

 thoracic segment are indicated by a slight depressed line only ; while in the second, 

 third, and fourth they are better separated ; and in the fifth, sixth, and seventh they 

 are articulated, elongate-triangular, and produced into acute angles posteriorly, the 

 last pair thus reaching the fifth abdominal segment. The first five abdominal seg- 

 ments occupy three-sevenths the length of the abdomen ; the first one being scarcely 

 distinct from the last thoracic, the next three equal, the next a little longer than 

 the preceding ones. The terminal segment is scutiform, narrower than the others, 

 and with caudal styles resembling the natatory feet in character, but thicker, harder, 

 and narrower; the inner stylet being three times as broad as the outer, and elongate- 

 subrhomboidal in shape. The color is light opaque yellowish, with patches of black 

 punctse on the front of the head, on the posterior two-thirds of all the dorsal seg- 

 ments except the terminal one, which is almost entirely covered with them, on the 



