1 02 S. I. /Smith — Crustaceans of the Atlantic Coast. 



taper distally more than in H. uiin-ops, and the inner margin in each 

 is armed with a series of twelve to eighteen slender spines, extend- 

 ing almost to the tip, in addition to the long sette, while in H. niicrops 

 there is only a single s|une near the base. The telson difters from 

 that of H. mio'ops in having the lateral margins incnrved at the tips 

 and each armed with eleven to sixteen spines, of which nearly all are 

 on the distal half of the margin and all placed at nearly equal dis- 

 tances from each other, none of the proximal ones being scattered 

 from the series as in H. microps ; the terminal spine each side has no 

 small spine at its base but stands entirely alone ; the sinus of the 

 terminal margin is broad and broadly rounded at the proximal end, 

 its lateral margins are nearly straight instead of convex in outline, 

 and there are only fourteen to twenty spines on the entire margin. 



All the specimens I have examined have been taken in August and 

 September and a large proportion of the individuals are females car- 

 rying eggs or young. The species was never found in abundance 

 except hidden away inside dead bivalve shells, usually Mactras, 

 dredged in 5 to 10 fathoms. As many as tw^enty were sometimes 

 foimd in a single shell. The males and young were occasionally 

 taken at the surface in the evening in Vineyard Sound. 



MysiS mixta Liljeborg. 



AUysis mixta Liljeborg, Hafs-Crustaceer vid Kullaberg, (Ef versiglit af Kongl. Vetens- 

 kaps-Akad. Forhandlingar, Stockholm, 18.52, pp. 3, 6. — Goes, Crustacea decapoda 

 Suecise, (Efversight af Yet. Akad. Forhand., 1863, 175 (15).— G. 0. Sars, Under- 

 sogelser over Christianiafjordens Dybvandsfauna, 35. 1869 (extr. Nyt Magazin 

 Naturvidenskaberne) ; Archiv for Mathematik og Naturvidenskab, Kristiania, ii. 

 p. 344, 1877. 



?Mysis latitans Kroyer, fit Bidrag til Kundskab om Krebsdyrfamilien Mysid*. 

 Naturhistorisk Tidsskrift, III, i, p. 30, pi. i, fig. 4, 1861. 



Massachusetts Bay!, off Salem, 1877: '20 fathoms, gravel, August 

 6, — more than 200 specimens: abundant, also in August, in 22 fath- 

 oms, gravel; :33 fathoms, sand and mud; 33 fathoms, soft mud; and 

 35 fathoms, mud and clay nodules: common in 48 fathoms, mud, 

 August 13. Gulf of Maine !, off Cape Ann, 1877: common at 90 

 fathoms, mud, August 14, and at 50 fathoms, mud, gravel and rocks, 

 October 17. Off Cape Ann!, 54 fathoms, gravel and stones, 1873. 

 Also abundant, in 30 to 50 fathoms, muddy and gravelly bottoms, at 

 various localities off Cape Ann !, 1878. Casco Bay !, August, 1873 : 

 six miles southeast from Seguin Island, 35 fathoms, mud ; about sev- 

 enteen miles off Cape Elizabeth, 64 fathoms, mud; and about 



