COPEPODS OF THE WOODS HOLE REGION 



207 



Chappaquidclick Island, July, 1925 ; found in abundance in Penzance 

 Pond and Sengekontacket Pond, Marthas Vineyard, July, 1926. 



Distribution. — Mediterranean (Claus) ; British I,sles (T. Scott, 

 Brady) ; coast of Norway (Sars) ; Gulf of Genoa (Brian). 



Color. — Body transparent and yellow, faintly tinged with brown ; 

 posterior portion of thorax and abdomen inclined to orange; eggs 

 bluish white and opaque ; eye yellowish red. 



Female. — Metasome short and stout, cephalic segment as long 

 as the thorax; urosome quite sharply defined from the metasome; 

 genital segment divided laterally ; caudal rami twice a,s wide as long. 

 First antennae very stout and excep- 

 tionally short, 5-segmented and densely 

 setose; exopod of first legs nearly as 

 long as endopod, both rami somewhat 

 widened; distal segment of fifth legs 

 oval, narrowed toward the tip, wdth 

 two very unequal apical setae, three 

 on outer margin and one on inner 

 margin ; inner expansion of basal seg- 

 ment with five setae. Total length, 

 0.5-0.65 mm. 



Male. — Inner distal corner of second 

 basipod of first legs with a stout spine 

 bent inward at right angles near its 

 center; distal segment of second en- 

 dopod as wade as long, armed at its 

 tip with a stout outer spine, also bent 

 at right angles near the center; the outer margin of this segment 

 is fringed with long cilia ; inner expansion of basal segment of fifth 

 legs removed from, and much shorter than, the distal segment, and 

 armed with three setae ; distal segment with five setae. Total length, 

 0,45-0.55 mm. 



Remarks. — This copepod may be recognized hj the remarkably 

 short first antennae and the structure of the fifth legs; it has never 

 before been reported from American shores, Brian has given good 

 figures and descriptions of development stages of this species in 

 Studi del Laboratorio Marino Genova, 1921 (pp, 82-84). 



DACTYLOPUSIA TISBOIDES (Claus) 



Figure 138 



Bactylopus tishoides Claus, Die frei lebenden Copepoden, p. 127, pi. 16, 1863. 

 Dactylopusia thisboides Saes, Crustacea of Norway, vol. 5, p. 126, pis. 77, 78, 

 1905. 



Occurrence. — Found in small numbers in one of the brackish ponds 

 on Chappaquiddick Island and in Great Pond, Falmouth ; found in 



Figure 137. — Dactylopusia hrevi- 

 cornis: a. Female, dorsal ; b, fe- 

 male, fifth leg ; c, male, fifth 

 leg ; d, male, sixth leg ; e, male, 

 endopod of second leg 



