124 



BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



3. Endopod of both second legs invaginated at its base inside, as in 



female; large, 3 mm. or more in length robusta (p. 126) 



Endopod of right leg only invaginated, left second endopod like 

 other legs; small, 2 mm. or less in length gracilis (p. 127) 



PLEUROMAMMA XIPHIAS (Giesbrecht) 



Figure 82 

 Fleurotuma xipliias Giesbrecht, Fauna und Flora des Golfes von Neapel, vol. 



19, p. 347, pis. 32, 33, 1892. 

 Pleuromamma xiphm.s Giesbrecht and Schmeil, Das Tierreich, Lief. 6, Cope- 



poda, p. 110, 1898. 



Occm^rence. — One female from the trawl wings, Station 951, Fish 

 Hawk^ south of Marthas Vineyard ; three females, trawl wings. Sta- 

 tions 2195, 2224, Albatross, south of Nantucket; two females, vertical 

 haul, Station 20044, Grampus, south of Georges 

 Bank. 



Distribution. — Tropical Pacific (Giesbrecht) ; 

 South African coast (Cleve, Stebbing) ; California 

 coast (Esterly) ; Gibraltar (Thompson and Scott) ; 

 Abrolhos Islands, Indian Ocean (Giesbrecht) ; 

 Malay Archipelago (A. Scott) ; Gulf of Maine 

 (Bigelow). 



Color. — Body banded, translucent or nearly 

 opaque bluish alternating with still more trans- 

 lucent or nearly transparent bands. Caudal seg- 

 ments, antennae, and all the appendages as clear 

 and transparent as water. An elongate blotch of 

 bright crimson extends lengthwise along the center 

 of the ventral surface between and around the 

 bases of the mouth parts and up into the head. 

 The eye is small and a lighter red. (Rathbun.) 

 Female. — Body long and narrow; forehead just 

 Figure 82.— pieuro- above the rostrum prolonged into a pointed proc- 

 mamma anpMas: o, ess ; head fused with the first segment ; urosome 

 h. head, lateral l^ss than half the length of the metasome; genital 

 ■^iew segment one-half longer than the two abdominal 



segments combined, protruding ventrally; luminous organ large, 

 nearly always on the right side ; fifth legs 4-segmented, the two distal 

 segments fringed with long hairs on their inner margins, the end 

 segment tipped with three setae, the inner one much longer than the 

 other two. Total length, 4-4.5 mm. 



Male. — Body more slender; urosome markedly asymmetrical, the 

 second and third abdominal segments pushed to the right, the anal 

 segment to the left; the left caudal ramus seems to come out of the 

 side of the anal segment ; the first, third, and fourth abdominal seg- 

 ments are heavily fringed with long hairs on the left side, the second 



