98 S. J. Smith — Crustaceans of the Atlantic Coast. 



have one or more less segments than the corresponding outer branch. 

 The number of segments in botli the inner and outer rami vai'ies 

 somewhat, liowever: in the fully adidt male, 28'5""" in length, there 

 are fourteen segments in each of the outer rami of the first pair ; 

 twelve in the outer and thirteen in the inner of the second and third 

 pairs; eleven in the inner and twelve in the outer of the fourth pair; 

 and only eight in the inner and twelve in the outer of the fifth pair. 

 In a young male, only 13 •5""" long, there appear to be one or two less 

 segments in each of tlie natatory rami of all the pleopods, although 

 the rudimentary rami in the first pair, and the lamellar appendage 

 of the inner ramus in the succeeding paii'S, are well-developed. 



The rudimentary pleopods of the female do not differ essentially 

 from same appendages in the allied genera. They resemble more 

 closely, however, the pleopods of the females of the species of Mysis 

 than of Parerythrops obesa, the seta^ with which they are armed 

 being fewer in number and miich longer than in that species. 



Massachusetts Bay !, off Salem, 33 fathoms, sand and mud, August 

 4, 1877, — young male and female; also 33 fathoms, soft mud, August 

 13, — one young male. Off Bay of Ohaleurs, (tuU' of St. Lawrence !, 

 50 and 70 fathoms, 1873, — adult male and two females, one, 16-5"'"' 

 long, the other, 14""". 



Pseudomma roseum G. o. Sars. 



Paeudomina roseum G. 0. Sars, Nj^e Dybvandscrustaceer fra Lofoten, Christiania 

 Videnskabs-Selskabs Forhandlinger, 1869, p. 154 (10); Carcinologiske Bidrag til 

 Norges Fauna, Mysider, parti, p. 54, pi. 4, 1870; Unders5gelser over Hardan- 

 gerfjordens Fauna, Crustacea, Christiania Videnskabs-Selskabs Forhandlinger. 

 1871, p. 263 (20); Archiv for Mathematik og Naturvidenskab, Kristiania, ii, p. 

 344, 1877. — Metzger, Jahresbericht der Comm. zur wissensch. Untersuchung der 

 deutschen Meere fiir 1872, 1873, Nordsee, p. 288, 1875. — Whiteaves, Report on 

 further deep-sea Dredging Operations in tlie Gulf of St. Lawrence [in 1873], p. 16, 

 [1874?]. 



Near Jeffrey's Bank!, Gulf of Maine, 105 fathoms, brown mud, 

 September, 1873, — one specimen. Gulf of St. Lawrence!, 1873, 28 

 miles east-northeast of Cape Gaspe, 110 fathoms; and 25 miles east 

 by north of Cape Gaspe, 210 fathoms, — several specimens at each 

 locality. West coast of Norway, at the Lofoten Islands !, 200 to 

 300 fathoms; and Hardanger Fiord, 100 fathoms, and between 400 

 and 500 fathoms (G. O. Sars). Off Mandel, southern Noi'way, 220 

 fathoms (Metzger). 



