9 2 



Stat. 220. November 1/3. Anchorage off Pasir Pandjang, west coast of Binongka. Surface. 



1 adult specimen. 

 Stat. 225. November 8. 5700 M. N. 279° E. from Southpoint of South-Lucipara-island. 894111. 



Horizontal cylinder. Very large number of specimens, of every size. 

 Stat. 230. November 14. Lat. 3°58'S., long. 128° 20' E. HENSEN vertical net, from 2000 m. 



to surface. 1 specimen, nearly adult. 

 Stat. 243. December 2. Lat. 4°3o'.2S., long. I29°25'E. HENSEN vertical net, from 1000 m. 



to surface. 2 adult and 2 half-grown specimens. 

 Stat. 245. December 3. Lat. 4 16'. 5 S., long. I30°I5'.8E. 4956 m. Surface. 2 nearly adult 



specimens. 

 Stat. 252. December 8/9. West side of Taam-island. 9 — 36111. Surface. 1 specimen, about adult. 

 Stat. 282. January 15/17. Lat. 8°25'.2S., long. i27°i8'.4E. 27 — 54 m. Plankton. 1 specimen, 



nearly adult. 



Description. — The frontal plate is a very short triangle terminating in a slender 

 rostrum (fig. 4«) about as long as the firmly chitinized part of the eye-stalks (as to the curious 

 anomaly of these parts found in some specimens from the Pacific see below). Lobe from first 

 antennular joint (fig. 4 ö) similar in both sexes, produced into a leaflet occupying somewhat 

 more than the inner half of the upper breadth at the end of the joint, directed somewhat 

 forwards and much upwards, distally deeply cleft by an extremely broad, obliquely triangular 

 incision and with each lateral angle produced into a spiniform process directed essentially 

 forwards and besides somewhat or considerably outwards. Second antennular joint distally near 

 each angle armed on the upper surface with a conspicuous protuberance, the outer blunt, the 

 inner triangular, subacute. Anal process similar in both sexes, with a couple of minute spinules 

 projecting from a broad basal part behind a moderately long and curved spine. 



The copulatory organs (figs. 4.C — 4*?) have all lobes well developed. The terminal process 

 is somewhat long, rather thick, distally curved and tapering with the end acute, and somewhat 

 before the end with a spine on the concave margin (this spine is totally hidden by the process 

 itself on fig. 4^-, partly visible on fig. 4^); its heel is short but distinct and the foot rather 

 long. The proximal process is considerably longer than the terminal, considerably curved, with 

 its basal third rather thick, while about the distal fourth is flattened, forming a narrow, distally 

 rounded plate (fig. 4<?), which seen from the side (figs. <\c — ^d) looks as if the process tapers 

 to an acute end, and at the base of this plate a blunt or acute tooth projects obliquely forwards. 

 The median lobe with a somewhat large, much curved, acute lateral process without any dorsal 

 tooth, while the distal half of the lobe is somewhat feebly chitinized, formed about as a plate 

 with the end rounded and at least frequently folded obliquely inwards as when the upper 

 angular part of a leaf in a book is folded inwards and somewhat backwards. The accessory 

 lobe is long. The setiferous lobe is slightly longer than the median, with about 7 setae along 

 the terminal margin and none on the outer margin . 



Length of a very large female 17.5 m., of an adult male 13.5 mm.; frequently adults 

 of both sexes are smaller. 



Remarks. — As to the differences between E. diomedece Ortm. and E. mutica see 

 the description of the last-named species. Ortmann established E. diomedece on two Pacific 

 specimens having the "frontal part of the carapace produced as a broad triangularqaointed plate. 



