194 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



male (stage V), which is apparently referable 

 to this species (figs. 18-20). The male of this 

 species has been hitherto unknown. 



Emhirella bella Giesbrecht, 1888 

 (Plate 9, figs. 1-13) 

 Pacific records: Vervoort, 1949; Wilson, 1950. 



Vessel : Station Occurrence 



Hugh M. Smith __ 153 2 females, 3.90, 4.18 



mm. ; 1 male, 3.33 

 mm. 



Do 31 2 females, 3.80 mm.; 



1 male, 3.36 mm. 



Do 63 1 female, 3.80 mm. 



Stranger 34 1 female, 3.80 mm. 



Remarks: The species of female Euchirella 

 are distinguished by the shape of the genital 

 segment, number of setae on the endopod of the 

 second antennae and the spination of the first 

 basipodal segment of the fourth pair of feet. 

 The males are identified by the structure of the 

 fifth feet. The genital segment of E. bella is 

 nearly symmetrical in dorsal view (figs. 1, 3) 

 and is produced in ventral view (figs. 2, 4). 

 The second segment of the endopod of the sec- 

 ond antennae in the specimens examined has 5 

 setae on the outer and 5 setae on the inner lobe 

 (fig. 5). Giesbrecht and Schmeil (1898) state 

 that there are 6 and 5 setae on these respective 

 lobes. The males in the present collections have 

 6 setae on the external lobe and 7 on the in- 

 ternal lobe, the 2 most internal ones being very 

 small and slender. Vervoort (1949) indicated 

 that there were 6 setae on each lobe. The num- 

 ber of spines on the first basipodal segment of 

 the fourth feet is variable. Some specimens 

 have 5 on each side and others have 4 on one 

 side and 3 on the other (fig. 9). Scott (1909) 

 and Sewell (1947) have also noted a variable 

 number of spines on this segment. 



Wilson (1950) has erroneously synonymized 

 E. amoena with this species. See discussion of 

 this under E. amoena below. 



Euchirella veniisia Giesbrecht, 1888 



(Plate 9, figs. 14-25) 



Pacific records: Scott, 1909; Farran, 1929; Ver- 

 voort, 1949; Wilson, 1950; Tanaka, 19.53; 1957b. 



Remarks: The female is identified by the 

 knob-like protrusion from the left posterior 

 margin of the genital segment (fig. 16) ; the 

 presence of 4 setae on the inner lobe and 5 

 setae on the external lobe of the endopod of the 

 second antennae (fig. 18) ; and the two long 

 spines on the first basipodal segments of the 

 fourth pair of feet. Sewell (1947) has recently 

 described the male, additional figures of which 

 are given herein (figs. 20-2.5). The second an- 

 tennae (fig. 23) have 6 setae on the outer lobe 

 and 7 setae on the inner lobe, 2 of which are 

 small. Sewell reported 6 setae on each lobe. 

 The structure of the fifth feet agrees quite well 

 with Sewell's figure of this appendage. 



Euchirella pulchra (Lubbock, 1856) 



(Plate 10, figs. 1-4) 



Pacific records: Esterly, 1905; Scott, 1909; Johnson, 

 1942; Wilson, 1942; Davis, 1949; Vervoort, 1949; 

 Brodsky, 1950; Wilson, 1950; Tanaka, 1953; 1957b. 



Vessel: Station Occurrence 



Hugh M. Smith ^_ 63 1 female, 3.42 mm. 



Remarks: The genital segment is produced 

 into a rounded swelling to the left (fig. 2). The 

 second segment of the endopod of the second 

 antennae has 6 setae on each lobe (fig. 3). 

 This is the number reported also by Tanaka 

 (1957b), but Giesbrecht and Schmeil (1898) 

 and Vervoort (1952) stated that the internal 

 lobe has 5 setae. Possibly the very small, inner- 

 most seta on the internal lobe was overlooked. 

 An additional identification character is the 

 presence of 2 spines on the first basipodal seg- 

 ment of the fourth pair of feet (fig. 4) . 



Euchirella amoena Giesbrecht, 1888 



(Plate 10, figs. 5-10) 



Synonymy 



Euchirella amoena Giesbrecht, 1888, Atti Ace. Lincei. 

 Rend., Ser. 4, 4, sem. 2: 336. 



Euchirella brevis, Sars, 1905. Bull. Mus. Oceanogr., 

 Monaco, 26: 12. 



Euchirella bella (partim), Wilson, 1950, U.S.N.M., 

 Bull. 100, 14: 218. 



