46 MARINE INVERTEBRATA OF GRAND MANAN. 



LEPTOTHOE, St., n. 



Body linear, segments well separated, epimera very small ; superior antennte 

 longest, -with a long accessory flagellum; inferior ones subpediform; legs of the first 

 two pairs with subcheliform hands, those of the second pair being largest, with uniar- 

 ticulate fingers. Caudal stylets of the last pair very long, with equal lanceolate rami 

 on short peduncles. This genus differs from Podocerus, Leach, in possessing accessory 

 flagella to the superior antennte; and from Cratopliium, Dana, in its long nonuncinate 

 terminal stylets, and in having the superior antennte longest. 



Leptothoe Dan.e, St., n. s.. Fig. 32. Body somewhat compressed, but rounded 

 above, glabrous, and of a uniform bright flesh color ; head three times as long as 

 the first thoracic segment, but not as broad, and bearing the small subreniform eyes. 

 Superior antennae with long terminal flagellum, and an accessory one of nearly one- 

 third its length, set on the very short penultimate article ; inferior antennae with 

 the penultimate article as long as the terminal one ; both pairs very hairy Legs 

 of the first two pairs compressed, those of the first pair very small, but similar in 

 character to those of the second, which have very large hands obliquely truncate 

 at their extremities for the reception of the short finger when closed. The remain- 

 ing thoracic legs are slender, those of the posterior pairs having elongated basal 

 articles. Natatory feet much elongated. The first three abdominal segments together 

 nearly equal in length that of the last four thoracic segments conjointly, and the 

 last of the three is considerably expanded below and produced backwai'ds. The 

 caudal stylets of the first pair project beyond those of the second, and those of the 

 third pair are very long, their peduncles constituting only about one-fifth of their 

 length. The tail terminates in a short, lamellar, bifid process. The thoracic seg- 

 ments in this species are each marked with an indistinct vertical line down the 

 middle on each side. Length, 0.9 inch; of Avhich the proportions of the other parts 

 are : greatest breadth, .1 ; height at the middle of the fourth thoracic segment, .12 ; at 

 the seventh, .13; length of the superior antenna?, .42; of the inferior antennae, .25; 

 of a leg of the second pair, .28 ; of a leg of the longest (seventh) pair, .37; of the 

 caudal stylets of the first pair, .19 ; of the terminal stylets, .2. This species inhabits 

 the laminarian zone, and seems to prefer for its residence patches of sandy bottom, 

 on which there are numerous weedy rocks. I have frequently taken what appeared 

 to be the young, in the coralline zone. It is more sluggish in its motions than is 

 usual with Amphipods. 



Cerapus rubricornis, St., n. s.. Fig. 33. Male much broader than high, tapering 

 at both extremities, the head being about half the width of the second thoracic 

 segment; the black eyes at the anterior corners of the head, on the oblique or 

 almost horizontal line connecting the bases of the upper and lower antenna?. The 

 second thoracic segment is the point of the gi^eatest breadth, from its bulging out to 

 accommodate the very large second pair of legs. Epimera very small, but increas- 

 ing in size from the first to the fifth thoracic segment, in which latter they are 

 comparatively large, while those of the sixth and seventh are scarcely perceptible. 



