530 BULLETIN 158, ITNITED STATES KATIOliTAL MUSEUM 



Female. — Head ten to fifteen times as long as wide, transversely 

 wrinkled at the posterior end, where it is considerably narrower than 

 the smooth anterior portion. Cej)halon separated by a distinct groove 

 and triangular, widest along the anterior margin and narrowed to a 

 rounded point posteriorly. On each side of the head is a large pad- 

 like process, curved dorsally and ventrally and ending in bluntly 

 rounded points. Neck slender anteriorly, where it is bent and 

 twisted in many directions and armed with several minute chitin 

 knobs, smooth, straight, and considerably widened posteriorly. 

 Trunk obcordate, the pits smaller than in the preceding species and 

 with their edges raised a little. Posterior processes half the length 

 of the trunk and covered with elongated cones all about the same 

 length. Ovisacs slender, at least twenty times as long as wide. 

 Length of head, neck, and trunk, each 15 mm. Ovisacs, 42 mm, 

 long. 



Male. — Unknown. 



Remarks. — The tiny 3-cornered cephalon and the narrow elon- 

 gated neck and ovisacs are the distinguishing characters of this 

 species. 



Genus SPHYRION Cuvier, 1830 



Feinale. — Cephalothorax transversely expanded into a pair of 

 enormous lateral processes, forming the sphyra, or hammer, from 

 the center of the anterior surface of which projects the head proj)er. 

 Neck smooth and often enlarged posteriorly; trunk enlarged trans- 

 versely and depressed; no abdomen, but a pair of knoblike caudal 

 rami. The single pair of posterior processes profusely branched; 

 ovisacs long and straight. In young females two pairs of antennae, 

 two pairs of maxillae and a pair of maxillipeds, but no legs ; in adult 

 females some of or all these appendages replaced by simple processes 

 or obsolete. 



Male. — Head separated from trunk, on a level with the dorsal 

 surface of the latter, the antennal area only covered with a minute 

 carapace. Trunk folded upon itself and completely fused without 

 distinction of parts; no abdomen, genital process, or caudal rami. 

 Two pairs of antennae, two pairs of maxillae, and a pair of maxilli- 

 peds. A single species here. 



SPHYRION LUMPI (Kr0yer) 



FiGUBE 315 



Lesteira lumpi Kr0yer, Naturh. Tidsskrift, ser. 3, vol. 2. p. 325, pi. 18, fig. 5, 



1863. 

 Sphyrion lumpi Wilson, Proc. U. S. Nat. Mus., vol. 55, p. 570, pis. 50-52, 1919. 



Occurrence. — Found in limited numbers buried in the tissues of the 

 rosefish {Sehastes marinus) captured off Cape Cod. 



