COPEPODS OF THE WOODS HOLE REGION 



33 



Male. — Head triangular, without the marginal indentations, but 

 narrowed somewhat anteriorly; genital segment wider than long; 

 urosome 4-segmented; caudal rami and second antennae as in the 

 female; both fifth legs present, the tip of the right leg scarcely 

 reaching the center of the second segment of the left leg. Total 

 length, 3-3.5 mm. 



Rennarks. — ^^Vlieeler secured a single female of this species at the 

 surface in the Gulf stream south of Marthas Vineyard. It is 

 pelagic and not likely to be found anywhere near shore. 



EUCALANUS MONACHUS Giesbrecht 



FiGUKE 17 



Eucalanus monachus Giesbeecht, Fauna und Flora des Golfes von Neapel, 

 vol. 19, p. 132, pis. 11, 35, 1892. 



Occurrence. — A single male was 

 taken by Wheeler in the Gulf 

 Stream south of Marthas Vineyard ; 

 no specimens were found in Rath- 

 bun's collections. 



Distnbution. — Western Mediter- 

 ranean (Giesbrecht) ; Malay Archi- 

 pelago (Cleve) ; South Africa 

 (Cleve) ; Adriatic (Steuer) ; Indian 

 Ocean off Ceylon (Thompson and 

 Scott) ; Gulf Stream south of 

 Marthas Vineyard (Wheeler). 



Color. — This species has never 

 been examined while alive, and 

 hence its color remains unknown. 



Female. — Head semielliptical and 

 not triangular ; forehead elongated 

 and evenly rounded; fifth segment 

 with rounded posterior corners; 

 genital segment wider than long; 

 urosome 3-segmented ; caudal rami slightly asymmetrical, second in- 

 ner seta of left ramus elongated; proximal segments of second an- 

 tenna twice as long as wide and shorter than the distal segment. 

 Total length, 2-2.35 mm. 



Male. — Head evenly rounded anteriorly; third thoracic segment 

 with a pair of stout setae at each posterior corner, which stand out 

 prominently from the sides of the body. Right fifth leg lacking, 

 left one 4-segmented. Total length, 2-2.25 mm. 



Remarks. — ^Wlieeler's single male still remains the only specimen 

 thus far obtained from the Woods Hole area. The species can be 

 recognized in the female by the comparative width of the genital 

 segment, and in the male by the absence of the right fifth leg. 



Figure 17.^ — Eucalanus monachus: a. 

 Female, dorsal ; b, left fifth leg of 

 male ; c, fourth leg 



