392 



BULLETIN" 15 8, UNITED STATES NATIONAL MUSEUM 



Genus BOTRYLLOPHILUS Hesse, 1864 



Metasome in female sharply marked off from urosome, its seg- 

 ments more or less completely fused and carrying at the posterior 

 end, on the dorso-lateral surface, the migrant fifth legs. Urosome 

 narrow cylindrical, 4-segmented; genital segment not enlarged. 

 First antennae 4-segmented; second antennae 3-segmented, pre- 

 hensile ; rami of first four pairs of legs 1- or 2-segmented, the exopods 

 with spines, the endopods with setae; fifth legs in female narrow, 

 setiferous processes extending backward from the dorso-lateral sur- 

 face of the fifth segment on each side of the adherent ovisacs ; in the 

 male not dorsally migrant, 1-or 2-segmented; first four exopods in 

 male 3-segmented, first endopod 1- or 2-segmented, the other three 

 endopods 2- or 3-segmented. A single species in this area. 



BOTKYLLOPHILUS BREVIPES Sars 

 FiGUEB 241 



BotryllopMlus hrevipcs Sabs, Crustacea of Norway, vol. 8, p. 68, pi. 32, 1921. 



Occurrence. — Several females were obtained from the branchial 

 sac of the ascidian PhaUusia ohliqua at Station 237, Fish Hawk. 



Distribution. — In ascidians on the coast 

 of Norway (Sars). 



Color. — Body pale reddish orange, the 

 ovaries, oviducts, and ripe ova bright green ; 

 eye dark red. 



Female. — Body short and stout; meta- 

 some segments completely fused, vaulted 

 dorsally and abruptly rounded posteriorly; 

 urosome more than half the length of the 

 metasome, 4-segmented, straight; genital 

 segment divided, the anterior portion 

 swollen; anal segment longer than the one 

 preceding it; caudal rami curved outward, 

 each tipped with four stout claws. First 

 antennae 4-segmented, very broad at the 

 base, but rapidly tapered distally; second 

 antennae 3-segmented, middle segment very short. Rami of first four 

 pairs of legs 1-segmented; setae on endopods enlarged at base and 

 slender distally ; fifth leg a narrow conical process, with one long and 

 two short apical setae. Total length, 1.5-1.75 mm. 

 Male. — Unknown, 



Remarks. — This species may be distinguished by the complete 

 fusion of the metasome segments and by the reduced segmentation in 

 the first four pairs of legs. 



Figure 241. — BotryllopMlus 

 brevipes: a. Female, lateral ; 

 b, female, fifth leg 



