970 CRUSTACEA. 



inferior pair. The hand of the second pair has the finger folding 

 against the very oblique under margin. There are small tufts of 

 short hairs on inner and lower margin of hand as well as at apex, 

 besides two or three setae on the back margin. The penult joint is 

 transverse, very narrow and obtuse below, and closely applied to the 

 hand. The preceding is quite small, but a little oblong. The poste- 

 rior six legs have the first joint subovate, with the posterior margin 

 entire, but one or two minute setae near apex. The legs are nearly 

 naked. The stylets extend back, nearly the same distance. 



Gammarus emissitius, Dan A, Proo. Amer. Acad. Sci., ii. 211. 



Female of D. emissitius? — Figures 10 a, b, c, d, e, Plate 66, represent 

 parts of a female (a specimen with eggs below the venter), which 

 we suspect may be of the above species. This is inferred from its 

 occurrence at the same locality with the emissitius, and from the form 

 of the legs of the second pair. Fig. 10 a, represents the anterior part 

 of the body ; b y fourth leg ; c, part of seventh ; d, caudal extremity 

 with the three pairs of stylets ; e, last pair in profile. The eye-pro- 

 jection of the lateral margin of the head is quite salient, but rounded. 

 The anterior legs have the fourth joint as broad as the fifth and twice 

 as long ; it is broadest at middle and narrows regularly (not with a 

 curve) towards base and apex, the under side being low triangulate, 

 and the upper slightly arcuate. The fifth joint is narrow at base, 

 and gradually widens, being also widest near middle or beyond it; 

 the lower margin is rounded, the upper nearly straight. The lower 

 side of both joints is hirsute. The finger is short, and the palm (or 

 the margin against which it closes) is oblique transverse, and without 

 any angle or spine at its termination. The leg of the second pair has 

 the fourth joint broad like the fifth, but hardly half as long; the two 

 are articulated with one another by the whole breadth of the extre- 

 mity of the fourth or base of the fifth. The fifth is quite oblong, and 

 has either margin a little arcuate, the lower the most so ; the palm is 

 oblique, and without a limiting angle below. The finger is about one- 

 third as long as the hand. The fourth and fifth joints have tufts of 

 setae below, but none hardly as long as the breadth of the joints. The 

 setae of the following legs are few and short, hardly as long as breadth 

 of fifth joint, and they are very slender. The third joint of the third 

 or fourth pair is narrow. The caudal stylets have somewhat lamellar 



