58 



BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



EUCHIRELLA PULCHRA (Lubbock) 



Figure 37 



Undina pulchra Ltjbbock, Trans. Ent. Soc. London, new ser., vol. 4, p. 26, pi. 4, 



figs. 5-8, pi. 7, fig. 6, 1856. 

 Euchirella pulchra Giesbrecht, Fauna nnd Flora des Golfes von Neapel, vol. 19, 



p. 233, pis. 15, 36, 1892. 



Occurrence. — Three females in a vertical haul, Station 20044, 

 Grampus, south of Georges Bank. 



Distribution. — Tropical Atlantic and Pacific (Giesbrecht, Brady) ; 

 Gulf of Guinea (Lubbock) ; Abrolhos, Australia, Caldera, Chile 

 (Giesbrecht) ; California coast (Esterly) ; North Atlantic (Brady) ; 

 Gulf of Maine (Bigelow). 



Color. — Body somewhat opaque, with red pigment above the mouth 



parts, along the median axis, and 

 on the basipods of the swimming 

 legs. The densely plumose setae 

 of the second antennae are also 

 pinkish or reddish and stand out 

 conspicuously as in other species 

 of the genus. 



Female. — Forehead with a low 

 crest and a small rostrum; uro- 

 some about one-fourth as long as 

 metasome ; genital segment asym- 

 metrical, with a stout protuber- 

 ance on the left side of the dorsal 

 surface and an indentation on the 

 right side; exopod of second 

 antenna two and one-half times 

 as long as endopod ; end segment 

 of the latter with six and five 

 setae ; basipod of fourth leg with 

 one or two spines on its inner margin. Total length, 3.4r-4.4 mm. 



Male. — Forehead with a crest and a rostrum ; urosome symmetrical ; 

 anal segment very short and divided at the center so as to cause the 

 caudal rami to appear 2-segmented ; fifth legs biramose, left endopod 

 so rudimentary as to be easily overlooked; chela on right leg shorter 

 than the basipod ; right exopod 2-segmented, proximal segment with 

 three angular protuberances on inner margin, distal segment with a 

 series of fine tubercles. Total length, 3.5-3.75 mm. 



Remarks. — This species may be distinguished by the presence of a 

 crest and by the relative lengths of the rami of the second antennae 

 in the female, and in the male by the fact that the chela of the right 

 fifth leg is shorter than the basipods. This species prefers the open 

 pc§an 3,n(i is not likely to be found in shallow water along the shore. 



Figure 37. — Euchirella pulchra: a, Female, 

 dorsal (after Sars) ; t, male, fifth legs ; 

 c, female, basipod of fourth leg ; d, 

 urosome, lateral (I), c, d after Giesbrecht) 



