COPEPODS OF THE WOODS HOLE REGION 



183 



base of the dactylus. Exopod of first leg slender and tipped with 

 three siibequal denticulate claws and a slender seta; inner seta of 

 basal expansion of fifth legs much shorter than the others. Total 

 length, 0.5-0.65 mm. 



Male. — A little larger than the female with a narrower urosome; 

 hand of chela on first antenna much longer than wide and only 

 moderately swollen, the dac- 

 tylus simple. Exopod of third 

 legs widened a little but not 

 lengthened, the basal segment 

 scarcely longer than the second 

 segment, the distal segment 

 with four long and rather slen- 

 der spines. The spiniform 

 process of the maxilliped chela 

 is slender and more sharply 

 pointed than in the female. 

 The fifth legs are reduced in 

 size but the inner apical seta 

 of the distal segment is as 

 large as the outer, while the 

 basal segment is very small 

 and not at all expanded on 

 the inside, and without setae. 

 Total length, 0.55-0.7 mm. 



Remarks. — This species can 

 be told by the spiniform proc- 

 ess on the hand of the maxilliped chela, and by the fact that the endo- 

 pod of the first legs only reaches the tip of the basal segment of the 

 exopod. It has never before been reported from American waters. 



HARPACTICUS GRACILIS Claus 



FiGtJEB 124 



Harpacticus gracilis Claus, Die frei lebenden Copepoclen, p. 135, pi. 19, 1863. — 

 Saes, Crustacea of Norway, vol. 5, p. 52, pi. 30, fig. 1, 1904. 



Occwrence. — Both sexes obtained in considerable abundance in 

 the Eel Pond, Woods Hole ; in two of the brackish ponds on Chap- 

 paquiddick Island; Penzance Pond, Woods Hole; Oak Bluffs Pond, 

 Sengekontacket Pond, and Nashaquitsa Pond, Marthas Vineyard; 

 Great Pond and Waquoit Bay, Falmouth; French Watering Place 

 on Naushon Island; Quissett Pond, Falmouth. 



Distribution. — British Isles (Boeck, Brady) ; Kiel Bay (Gies- 

 brecht) ; Mediterranean (Claus) ; Norwegian coast (Sars) ; Adriatic 

 (Grandori, Pesta) ; Gulf of Genoa (Brian). 



Figure 123. — Harpacticus tencUus: a, Fe- 

 male, dorsal (after Sars) ; b, female, fifth 

 leg ; c, male, fifth leg ; dj male, maxilliped 



