478 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxm. 



The collection of the U. S. National Museum includes the following 

 lots, which are excellently preserved and especially rich in specimens 

 of the male sex. They were all taken from the wSunfish, Afola rnola, 

 with the single exception mentioned. Cat. No. 3698, U.S.N.M., 

 from Jeffreys Bank by the schooner Paul Revere, includes two females. 



Cat. No. 12913, U.S.N.M., from Woods Hole in 1SS6, contains 

 thirty females and seven males; Cat. Nos. .82783, 32784, and 32786, 

 U.S.N.M., were obtained by the schooner Grampus 120 miles off 

 Woods Hole in 1900; the first and last contain about thirty females 

 each, the second one contains ten males. Cat. No. 32785, U.S.N.M., 

 contains two males and one female and was obtained from the irills 

 of a Moonfish, Selene vomer, at Woods Hole in 1905. 



Genus PHILORTHRAGORISCUS Horst. 



Dincmalura (D. scrrata) IvaoYER, 1863, p. 176. 

 I'hilorlhragoriscus (P. strratus) Horst, 1397, p. 137. 



Female. — Carapace well rounded, a little wider than long. First 

 thorax segment only fused with the head; second and third seg- 

 ments fused inter se and furnished with a pair of small lateral plates ; 

 fourth segment with a pair of large dorsal plates, fully as wide as the 

 carapace, and overlapping three-fifths of the genital segment. This 

 latter nearly the size of the carapace and covered by a pair of large 

 tlorsal plates, whose margins are finely serrated. Abdomen small, 

 considerably wider than long, one-jointed and attached to the ventral 

 surface of the genital segment so far forward as to be almost entirely 

 concealed in dorsal view. Anal laminae large, foliaceous, divergent, 

 each armed with four short spines. Frontal plates well fused with 

 the carapace; first antennas long and two-jointed; second pair three- 

 jointed and uncinate. Mouth-tube long and pointed; mandibles 

 with very wide and blunt teeth; second maxillae short, jointed, and 

 simple; sec(md maxillipeds large, with a stout terminal claw. 



All the swimming legs biramose; rami of first three pairs two- 

 jointed and armed with both spines and plumose setae, rami of fourth 

 pair one-jointed, bearing short spines only; fifth pair entirely lacking. 

 Egg-tubes straight or coiled outside the body, several times the body 

 length; eggs as in the Pandaririae. 



Male. — Carapace much larger than the rest of the body, wider 

 than long, its dorsal surface grooved as in the Pandarinae; no eyes 

 visible. Second and third thorax segments fused inter se, and 

 furnished with a pair of small lateral plates; fourth segment with a 

 pair of very small and rudimentary dorsal plates which scarcely over- 

 lap the genital segment at all. Genital segment subquadrangular, 

 with slightly rounded sides; covered with two dorsal plates thor- 

 oughly fused along the mid-line, with a posterior margin and sinus 

 exactly like that in Perissopus. 



