532 



BULLETIN" 15 8, UNITED STATES NATIONAL MUSEUM 



Male. — Body slender, cylindrical, and distinctly segmented; head 

 separated from first segment, without a carapace; first and second 

 thoracic segments as wide as head, the others considerably narrower 

 and passing insensibly into the abdomen, which is made up of four 

 segments; caudal rami elongate and cylindrical. First antennae 

 6-segmented; second antennae 2-segmented, each tipped with two 

 clawlike spines ; second maxillae stout and armed with strong spines ; 

 maxillipeds small and feeble. A single species within the present 

 area. 



PHILICHTHYS XIPHIAE Steenstrup 



Figure 316 



Phyliclithys xiphiae Steenstrup, Kongl. Vid. Selsk. Forh. 1861, p. 295, pi. 2, 1862. 

 Bebgsoe, Naturh. Tidsskrift, ser. 3, vol. 3, p. 87, pi. 13, 1864. 



Occurrence. — Found free in the mucous canals of the head of the 

 common swordfish captured off Marthas Vineyard. 



Distribution. — Kattegat (Steenstrup, Bergsoe) ; Mediterranean 

 (Kichiardi, Vall'e, Carus) ; Belgian coast (Beneden) ; New Zealand 



(Thomson) ; English seas (T. 

 and A. Scott) ; New England 

 coast (Goode, Rathbun, Lin- 

 ton). 



Color. — Body white, becom- 

 ing a faint salmon-pink on 

 the swollen lobes of the ante- 

 rior thorax. The digestive 

 canal shows as a dark line 

 through the center of the 

 body. The eggs are oliva- 

 ceous, deepening with develop- 

 ment ; the eye is reddish. 



Female. — Anterior cephalo- 

 thorax composed of three 

 small segments, the first very 

 minute, the second bearing the 

 mouth opening and the dor- 

 sal eye and anteriorly a knob- 

 like process on each side of 

 the first segment, the third segment larger with two dorsal processes 

 on each side. Second and third thoracic segments enlarged into a 

 disk, whose width is one-third the length of the whole body, each 

 segment with a pair of irregularly branched ventral processes. 

 Fourth, fifth, and genital segments about the same width and much 

 narrower than the second and third segments, each with one or more 

 pairs of lateral processes, which surround the ovisacs. Abdomen 



Figure 316. — Philichthys xiphiae: a. Female, 

 dorsal ; b, male, dorsal 



