56 



BULLETIISr 15 8, UNITED STATES NATIONAL MUSEUM 



Female. — ^Forehead without a crest but with a rostrum; urosome 

 symmetrical; genital segment as long as the three abdominal seg- 

 ments combined ; caudal rami as wide as long, quite divergent, with 

 tufts of hairs on their inner margins; distal segment of endopod 

 of second antenna with eight and six setae; basipod of fourth leg 



with a row of six or seven flat- 

 tened spines on the posterior 

 surface. Total length, 2.75-3.25 

 mm. 



Male. — Forehead like that of 

 female; body considerably 

 smaller ; genital segment not pro- 

 truding ventrally ; fifth legs bira- 

 mose, endopods 1-segmented, 

 right exopod 2-segmented, left 

 3-segmented; inner margin of 

 ri ght exopod smooth and 

 unarmed. 



Remarks. — Cleve has shown in 

 his discussion of the plankton of 

 the North Sea, the English Chan- 

 nel, and the Skager Rak^ that 

 Brady's Euchaeta hessei is really 

 the male of the present species. 

 It probably enters the Woods 

 Hole area as a visitor from con- 

 siderable depths along the edge of the Gulf Stream, since the speci- 

 mens here recorded were taken at a depth of 1,000 fathoms. Bigelow 

 says that apparently it does not enter the Gulf of Maine except 

 during the warmer summer months. 



EUCHIRELLA MESSINENSIS (Glaus) 

 FlGUEE 36 



Undina messinensis Claus, Die frei lebenden Copepoden, p. 187, pi. 31, figs. 8-18, 



1863. 

 Euchirella messinensis Giesbrejcht, Fauna und Flora des Golfes von Neapel, 



vol. 19, p. 232, pis. 15, 36, 1892. 



Occurrence. — One female from trawl wings, Station 994, FhK 

 Hawk; one female from trawl wings, Station 2093, Albatross, south 

 of Marthas Vineyard. 



Distribution. — Messina (Claus) ; Mediterranean (Giesbrecht) ; Gulf 

 of Guinea (T. Scott) ; Indian Ocean (Thompson and Scott) ; west 



FiGUEB 35. — Euchirella rostrata: a. Female, 

 dorsal ; b, male, fifth legs (r, right leg) ; 

 c, female, basipod of fourth leg 



' &venska Akad. Handl., vol. 33, p. 4, pi. 2, figSL 1-2, 1900. 



