no. 2065. THE CRUSTACEA EUPHAUSIACEA— HANSEN. 65 



organs, but females, especially not quite full-grown specimens, may 

 sometimes be difficult to separate with certainty, though the shape 

 of the lobe of the first antennular joint generally affords a good 

 character. The single male has the processes of the copulatory 

 organs agreeing with my figure in the Harvard work ; this specimen 

 measures about 33 mm. and is a little smaller than the female 

 Chinese specimen, which is 35 mm. long. That the two Atlantic 

 females secured, respectively, in the Gulf of Mexico (Station 2382) 

 and off the northern part of Florida (Station 2665) belong to T. 

 orientalis is quite certain, but according to the color of the eyes, the 

 shape of the lobe of the first antennular joint and the fourth abdomi- 

 nal segment feebly produced at the dorsal line I must refer the sub- 

 adult female from Station 994 to T. orientalis, though it has been 

 taken so far northward in the area occupied by T. acutifrons. 



Distribution. — This species had been captured in the tropical East 

 Pacific south of the line, in the Indian Archipelago, and by the Prince 

 of Monaco in the North Atlantic west of southern Spain. The dis- 

 tribution is thus very different from that of T. acutifrons. 



7. THYSANOPODA CORNUTA Illig (1905). 



Plate 1, fig. la. 



1905, March 28. Thysanopoda cornuta Illig, Zool. Anz., vol. 28, p. 663 (with 



three text-figures). 

 1905, April 1. Thysanopoda insignis H. J. Hansen, Bull. Mus. Oc£an. Monaco, 



No. 30, p. 19 (with three text-figures). 



Occurrence. — The Albatross has captured this gigantic species at 

 two stations, one in the Northwest Atlantic, the other in the Pacific 

 at southern Japan. 



Sta. 2717. September 18, 1886. Lat. 38° 24' N.; long. 71° 13' 

 W. 1,615 fathoms. 1 specimen. 



Sta. 4953. August 22, 1906. Lat. 31° 39' N.; long. 132° 54' 40" 

 E. 1,350 fathoms. 1 specimen. 



Remarks. — Both specimens are females; the Atlantic specimen 

 measures 60 mm., that from the west Pacific 79 mm. from the front 

 margin of the carapace to the end of the telson. To the description 

 in my paper quoted, a few remarks may be added. 



The narrow longitudinal strip near most of the lower lateral 

 margin of the carapace is thickened as a conspicuous ridge (fig. la) ; 

 considerably above this ridge another ridge runs subparallel with 

 the lower margin, but the last-named ridge is only half as long as 

 the carapace, disappearing at some distance from the hind margin, 

 and very far from the front margin of the carapace. This descrip- 

 tion conveys a more correct idea of the structure than my earlier 

 mention of two longitudinal furrows, which seem to be found, one 

 a little above the lower margin, consequently at the upper margin 

 of the lower ridge, and the other just below the upper lateral ridge. 

 59758°— Proc.N.M. vol.48— 14 5 



