COPEPODS OF THE WOODS HOLE REGION 



61 



without spines; genital segment with a blunt process on the right 

 side and a ventral protrusion, upon which is a stout spine at the 

 right of the genital orifice, extending backward; exopod of second 

 antenna one-half longer than endopod. Total length, 4.5-5.5 mm. 



Male. — Head with prominent crest; posterior corners of fifth seg- 

 ment more angular, but without spines; exopod of second antennae 

 only one-fourth longer than endopod; endopods of fifth legs 1-seg- 

 mented, exopods 3-segmented ; right endopod not reaching the center 

 of the middle segment of the exopod; the latter only half as long 

 as the end segment. In young mUles the rami of the fifth legs are 

 all 1-segmented, exopods much larger than endopods. Total length, 

 4r-4.9 mm. 



Remarks. — This species may be recognized by the crest on the 

 head, the asymmetry of the genital segment in the female, and the 

 pattern of the fifth legs in the male. 

 It occurs in great numbers off the 

 coast of Ireland, but does not seem 

 at all abundant on this side of the 

 Atlantic. Bigelow has designated 

 it as " one of the rarest of strays 

 from the oceanic basin offshore." 



UNDEUCHAETA MINOR Giesbrecht 

 FiGUEE 40 



Undeuchaeta minor Giesbrecht, Fauna 

 und Flora des Golfes vou Neapel, vol. 

 19, p. 228, pis. 14, 37, 1892. 



Occurrence. — Four females from 

 trawl wings. Stations 2093, 2173, 

 2195, Albatross., south of Nantucket 

 and Marthas Vineyard. 



Distribution. — West coast of Ire- 

 land (Farran); Faroe-Shetland 

 Channel (With); tropical and 

 southern Atlantic (Cleve) ; Malay 

 Archipelago (A. Scott) ; North Sea (Wolfenden, van Breemen) ; 

 California coast (Esterly) ; tropical Pacific (Giesbrecht) ; Gibraltar, 

 Indian Ocean (Thompson and Scott) ; Gulf of Maine (Bigelow). 



Color. — Body colorless but not fully transparent, with red pig- 

 ment along the midline and on the bases of the mouth parts; the 

 contents of the digestive tract are sometimes colored a deep orange- 

 red. In the male the long setae of the caudal rami, the second 

 antennae, and the swimming legs are sometimes tinted with bright 

 colors. 



Figure 40. — Undeuchaeta minor: a. 

 Female, dorsal (after Sars) ; 6, fe- 

 male, urosome, lateral ; c, male, fifth 

 legs (6 and c after Giesbrecht) 



71937—32- 



