Boone, Crustacea, Cruises of "Eagle" and " Ara," 1921-28 121 



Afd. 4, Bind. Kjobenhavn, p. 252, p. 278, p. 285, pi. 3, figs. 4, a-e, 

 1859. — A, Ortmann, Ergebnisse der Plankton-Exp. der Hum- 

 boldt- Stiftimg, Bd. II, Kiel und Leipsig, p. 38, pi. 3, fig. 3, 1893. 

 — ^A. KoNiG, Denkschr. Math.-Naturv. Kl. Akad. Wiss. Wien, Bd. 

 62, Wien, p. 13, pi. 2, figs. 12-13, pi. 3, figs. 15, 16, 1893.— H. J. 

 Hansen, Proc. Zool. Soe. London, 1896, p. 957; Sergestidae of 

 the Siboga Expedition, Siboga Exped., vol. 38, Leiden, p. 21, 

 1919; Results Campag. Sei. Monaco, Fasc. 44, p. 126, pi. i, figs. 

 6-7m, Colored, 1922. — A. Senna, Bull. Soc. Entom. Ital., Anno. 

 34, Iv, Firenze, p. 285, pi. 10, figs. 1-14, 1903.— G. Illig, Deutsche 

 Sudp.-Exp. Band. XV, Zool. VII, Berlin, p. 357, figs. 6-10, 1914.— 

 0. Sund, Michael Sars North Atlantic Deep Sea Exped. 1910, 

 vol. 3, pt. 2, Zool., Bergen, 1920, p. 9, figs. 6-10, 1920. 



Sergestes phorcus Faxon. 



Plate 40. 



Type: Mr. Faxon's type material was taken at six Albatross sta- 

 tions, between Cocos Island and Malpelo Island, and in the Galapagos 

 Islands, in depths ranging from 292 to 1793 fathoms. 



Distribution: Tropical American Pacific, deep-sea. 



Material examined: One specimen, dredge down 300 fathoms — 

 depth, 1400 fathoms — Pacific Ocean, seven miles off Cape Malo, 

 Panama, March 30, 1926, by the "Ara." 



Color : Living specimens spectrum red. 



Technical description: Rostrum short, upward directed, distal 

 margin produced to a small, median point on either side of which 

 it is convex; the upper lateral margin of the rostrum does not con- 

 tinue posteriorly on the carapace as a carina. 



The carapace is soft, smooth, semitransparent, somewhat compressed 

 laterally. The frontal margin is slightly sinuate, being shallowly 

 excavate behind the eye and produced to a moderate convex lobe at 

 the antennal base, beyond which it is again excavate. The concave 

 anterolateral margin is fringed with cilia; the lateral margin is con- 

 vex and bent under the body. There are two clearly defined trans- 

 verse grooves on the carapace, the cervical, which occurs about 

 two-fifths of the length of the carapace from the rostrum and curves 

 downward, uniting with a longitudinal lateral groove that extends 

 forward to the anterolateral angle, and posteriorly to beside the 

 strong longitudinal carina, which extends from the urogastric line to 



