324 DESCRIPTIONS OF PARASITIC COPEPODA. 



abruptly enlarges at the base ; the secoud joiut is closely margined with 

 Hue hairs aloug the iuuer margin. 



The thoracic appendages are of moderate size, nearly as iihick as 

 wide, rather abruptly expanded and indented at the ends, as shown on 

 plate XI, fig. 2, the terminal projections on each side being rounded. 

 The first pair originate immediately back of the head, and are smaller 

 than the second pair, though not very much shorter. When com 

 pressed against the ventral surface, the appendages of the second pair 

 extend but a moderate distance back of the lateral thoracic wings, and 

 those of the first pair overlap the second but slightly. Following these 

 appendages, and in the same line, there is a pair of short, stout, simple 

 abdominal appendages, belonging to the first segment ; they are some- 

 what conical in shape, rounded at the ends, and sometimes more or less 

 compressed vertically ; they are located close to the margin. 



The total length of the body, including the antennae, is about 6™™. 

 The ovigerous tubes are slightly shorter than the body, or of about 

 the same length. They are comparatively large, taper but slightly, 

 and are rounded at the ends. The color of the body in alcohol is a 

 sort of yellowish white, or light flesh color; ovigerous tubes dull yel- 

 lowish. This species has been found on two species of Cottunculusj 

 living in the gill cavity. Males were attached to most of the females. 

 The specimens were all collected by the U. S. Fish Commission steamer 

 Albatross. 



RECORD OF SPECIMENS EXAMINED. 



From Gottunculus torvus. 



Lat. 410 11' 30" N., long. 66° 12' 20" W., 449 fath., sta. 2078; 3 specimens 

 (6139). 



From Gottunculus microps. 



Lat. 390 58' 35" N., long. 71° 00' 30" W., 197 fath., sta. 2092; 2 specimens 

 (6166). 



From Gottunculus f, sp. ? 



Lat. 390 29' N., long. 71^ 46' W., 693 fath., sta. 2181 ; 1 specimen (8454). , 

 REFERENCE TO THE PLATES. 



Fig. 1, of Plate V, was drawn by Mr. J. H. Emerton; all the other 

 figures are by the author, and were drawn mainly from alcoholic speci- 

 mens, with the aid of the camera lucida. Delicate opaque appendages 

 were treated with a dilute solution of caustic potash, and were observed 

 under as slight pressure as possible. 



