S. 1. Smith — Crustaceans of the Atlantic Coast. 
93 
i, p. 24, pi. 1, 1 S70 ; Undersogelser over Hardangerfjordens Fauna, Crustacea, 
Christiania Videnskabs-Selskabs Forkandlinger, 1871, p. 262 (19), 1872. — Metz- 
ger, Jahresbericht der Comm, zur wissensch. Untersuchung der deutschen Meere 
fur 1872, 1873, Nordsee, p. 288, 1875. 
Massachusetts Bay!, off Salem, August, 1877: 20 fathoms, rocks 
and gravel; 33 fathoms, sand and mud; and 48 fathoms, soft mud. 
Skager Rack, 49 fathoms (Metzger). West coast of Norway !, 30 to 
150 fathoms (G. O. Sars). Spitsbergen (Goes). 
Meterythrops, gen. uov. 
The large and very interesting species, for the reception of which 
this genus is here proposed, was first made known to me, several 
years ago, by a few, more or less imperfect, specimens dredged in the 
Gulf of St. Lawrence, in 1873, by Mr. J. F. Whiteaves, and, in his 
report on dredging for that year, it is referred to, on my authority, as 
a species “ near to Erythrops and Parerythrops.” The same species 
was dredged in 1877 by the party of the IT. S. Fish Commission on 
board the “ Speedwell,” but only imperfect specimens were obtained. 
The following description and the accompanying figures are based on 
this meager material. The species combines several characters of 
the genera Erythrops and Parerythrops of G. O. Sars, but in general 
appearance is more like the latter genus. The new genus may be 
characterized as follows : 
The body very short and obese with the posterior cephalothoracic 
segments almost completely covered above by the large and broad 
carapax. The eyes well-developed, large, nearly globular, and black 
after preservation in alcohol. The antennulse, antennae, and the oral 
and cephalothoracic appendages nearly as in Parerythrops. The 
pleopods in the female rudimentary and very nearly as in Mysis ; in 
the male, as in Erythrops, all the five pairs being well-developed, 
biramus, and natatory; the inner ramus in the first pair, however, 
rudimentary and with the terminal part membranaceous, expanded, 
and nearly naked. The telson long, narrow, sub-triangular, the lat- 
eral margins naked, and the apex narrow, truncate, and armed with 
four spines and two median setae. The ovigerous pouch composed of 
four large lamellae nearly as in Mysis. 
Meterythrops robusta, sp. nov. 
Plate XII, figures 1 and 2. 
The carapax as seen from above is of nearly equal breadth to near 
the posterior extremity, where it is slightly eontraeted. The frontal 
