308 



BULLETIN 158, UNITED STATES NATIONAL MUSEUM 



distal corner, aesthetask on third segment not jointed. Endopod of 

 first leg with two stout apical spines, the inner one curved and 

 acuminate; end segment of first exopod with two filiform setae and 

 two coarse spines, all apical; fifth legs fused at their base only, each 

 with two short and blunt apical spines. Total length, 0.45-0.55 mm. 

 Remarks. — The details of the rostrum and the fifth legs will clearly 

 separate this species from the other two here described. Sars said 

 of it : " It generally occurs at moderate depths on a muddy bottom 

 covered by decaying algae, and may at once be recognized by its 

 vivid fiery red color." ^ 



METIS JOUSSEAUMEI (Richard) 



Figures 185, 186 

 Ilyopsyllus jousseaumei Richakd, Bull. Soc. Zool. France, vol. 17, p. 69, 1892. 



Occurrence. — Found in Great Harbor, Little Harbor, and the Eel 

 Pond at Woods Hole, and in every one of the ponds from which 



collections were made along the 

 south shore of Cape Cod, on 

 Chappaquiddick Island, and on 

 Marthas Vineyard ; also in Cutty- 

 hunk Harbor. The water in these 

 ponds varied in salinity from a 

 percentage equal to that of the 

 ocean down to a mere trace, so 

 that this copepod must be able to 

 adapt itself to any salinity. 



Distnhution. — Gulf of Guinea 

 (T. Scott) ; Gulf of Suez, Ceylon 

 (Thompson and Scott) ; Malay 

 Archipelago (A. Scott) ; Irish 

 seas (Richard) ; Woods Hole 

 (Sharpe). 



Color. — In a collection of 250 

 specimens from Penzance Pond, 

 Woods Hole, a few were found to 

 be absolutely colorless and trans- 

 parent, and the remainder showed 

 every gradation through yellow, 

 orange, pink, and light red up to a blood red so deep as to be almost 

 black. But the blood-red specimens far outnumber all the other 

 shades combined, and this must be taken as the real species color. 

 None of the specimens showed any traces of the bright-red spots so 

 characteristic of natans, but some of them did show the banding of 

 color found in that species. Internal organs very dark, almost black. 



Figure 185. — Metis jousseaumei: a, Male, 

 first antenna ; i, male, first leg ; c, 

 male, fifth leg ; d, male, rostrum 



8 Crustacea of Norway, vol. 5, p. 346, 1910. 



