54 MARINE INVERTEBRATA OF GRAND MANAN. 



equal, with very long, slender, filiform flagella, and in length about equalling that 

 of the ])ody ; the superior ones thick-based, and a little the largest. Mandibles 

 ■with sharp curved apices, and large palpi consisting of three articles, the basal one 

 of which is very short, the second broad, and the terminal one very slender. 

 Maxillipeds slender, pointed, with large internal lamellae. Hands very small, 

 those of the first pair largest. Posterior five pairs very slender, terminating in 

 curved fingers. Natatory feet well developed. Caudal stylets of the first two 

 pairs almost acicular, with small spines above ; those of the third pair with broad 

 lancet-shaped rami. Tail terminating in two lamelliform spines. Color variable, 

 generally dark-mottled purplish. Length, 0.4 inch, generally much smaller. It 

 differs from Ampli. inermis, Kr., Grunl. Amfip., t. iii. f. 11, in its larger eyes and 

 epimera, and much longer caudal stylets. This species may always be found in the 

 greatest abundance in the little pools left by the tide among the rocks near low- 

 water mark. They are very active, swimming about in all directions, and seldom 

 resting long in one place. 



MOI^OClJIiODES, St., n. g. 



Body tumid anteriorly ; head rostrate, with the eyes so close together as to 

 appear one. Superior antennae without accessory flagellum ; inferior ones sub- 

 pediform. Legs of the first two pairs with large subcheliform hands, formed of the 

 last two articles of each ; the antepenult joints having their inferior apices pro- 

 duced into slender thumbs. Legs of the posterior five pairs unguiculate, those of 

 the last pair being exceedingly long. Caudal stylets all biramous ; the rami being 

 equal. Maxillipeds large, elongated, with unguiform terminal articles, and internal 

 lamella3 of about one-half their length. Mandibles palpigerous. 



This genus resembles Eusirus in the structure of the hands, and (Edicerus in its 

 long posterior feet. 



M. DEMissus, St., n. s. Body smooth and shining, broad and thick anteriorly, 

 and slender posteriorly; the abdomen constituting more than three-sevenths of the 

 total length. Epimera of the first five pairs of considerable size; the rest very 

 small. Head tumid, terminating anteriorly in a large, subtriangular rostrum, 

 curving downward; at the base of which above are the large vermilion-colored 

 eyes, which are so near together as to appear one, even when viewed from above. 

 Antennae thick-based and about equal in length, reaching the fourth thoracic seg- 

 ment; the superior ones with a much longer flagellum than the subpediform inferior 

 ones. Legs of the first two pairs with large oval hands, strong fingers, and thumbs 

 formed from prolongations from the antepenult joints, which are largest in the 

 second pair. The remaining legs are simply unguiculate, the fifth and sixth pairs 

 being very short, and the seventh of great length. Caudal stylets nearly smooth, of 

 considerable length, tapering to fine points; the first pair reaching the extremities 

 of the third. Color wine jX'Uow. Length, 0.35 inch. Dredged in four fathoms, 

 on a coarse sand and nullipore bottom, off Duck Island boat-moorings. 



Gammarus Sabinii, Leach, Sabine's Appendix, t. i. f. 8-11; Kroyer, Gronland's 



