20 



developed, wherefore such specimens ought to be determined by aid of comparison with full- 

 grown individuals. The "Siboga" material comprises two species, E. imguiailata Will.-Suhm 

 and E. major n. sp., but as E. scitlpticatida Faxon is known from the Pacific, the Bay of 

 Bengal, the Arabian Sea and the Atlantic, it is probably a mere accident that it was not taken 

 by the "Siboga". 



Key to the Species of Encopia . 



A. Telson with a lateral constriction somewhat in front of the end, with 

 a network of ridges enclosing honeycomb-like cells on a rather 

 long part of the upper surface, and without a pair of long terminal 

 spines. Gnathopods robust, their si.xth joint scarcely more than twice 



as long as deep E. sailpticaiida Faxon. 



B. Telson without any distal lateral constriction and without rounded 

 dorsal impressions or cells, but with a single pair of long terminal 

 spines. Gnathopods slender, their sixth joint at least about four 

 times as long as deep. 



a. Anterior margin of the frontal plate feebly conve.x. The eyes look 

 essentially outwards, occupying more than one-third, frequently 

 about two- fifths, of the outer margin of the whole appendage 

 (stalk + cornea). (Terminal joint of the exopod distinctly broader 

 than long). Species of very moderate size, measuring generally 



27 — 30 mm., at most 38 mm E. tmgtiictilata^'^.-'ix^xn. 



b. Anterior margin of the frontal plate very convex. The eyes 

 look essentially forwards, occupying less than one-fourth of the 

 outer margin of the whole appendage. Large forms, measuring 

 40 — 70 mm. in length. 



a. Terminal joint of the exopod of the uropods slightly broader 

 than long. Eye-stalks (with eyes) scarcely twice as long as 

 broad. Large species E. major n. sp. 



|3. Terminal joint of the exopod of the uropods a little longer 

 than broad. Eye-stalks (with eyes) more than twice as long 

 as broad. Very large species . E. australis Dana. 



6. Eucopia unginculata Will.-Suhm. PI. I, fig. 3^. 



1875. Clialaraspis unguiciilata Willemoes-Suhm, Trans. Linn. Soc. Lond. Ser. 2, Vol. i,p. 37, 



PI. VIII (At least partly). 

 1905. Eucopia unguiciilata H. J. Hansen, Bull. Mus. Oc. Monaco, N" 42, p. 3. 



Stat. 211. September 25. Lat. 5°40'.7 S., long. I20°45'.5 E. 1158 m. Deep-sea trawl, i specimen. 

 Stat. 230. November 14. Lat. 3° 58' S., long. 128° 20' E. Hensen vertical net, from a depth 

 of 2000 m. to surface, i specimen. 



