64 



on the outer margin with a single denticle less or more distant from the terminal good-sized 

 tooth; the terminal lobe a good deal broader than long and overreaching the terminal tooth. 

 (Endopods of the thoracic legs lost). 



Abdomen about as in M. picta. Uropods slender (fig. \B)\ the exopod nearly seven and 

 a half times as long as broad, much longer than the endopod. Telson shorter than in M. picta, 

 not fully half as long again as broad, with the lateral margins conspicuously concave behind the 

 broad basal third ; its end is truncate, very short, and if an armament existed is has been lost, 

 only rudiments of the usual pair of setae and of an exceedingly fine pair of postero-lateral spines 

 being preserved. — The colour of the animal is yellowish, with the gastric region reddish-brown. 



Length of the single, probably adult, male 9.7 mm. 



Synerythrops n. gen. 



Description. — Allied to Erythrops G. O. S., Parerythrops G. O. S., and Katery- 

 throps Holt & Tatt. Eyes of very moderate size, not depressed. Antennular peduncle (in the 

 female) robust. Antennal squama well developed, of usual shape. Left mandible (PI. IX, figs. 5a 

 and 5/') with the incisive part and the movable lacinia well developed, but the row of strong 

 setse is short, while the molar process is very broad, with the end cut off vertically ; second 

 joint of the palp much expanded, only a little more than twice as long as broad, while the 

 third joint is very slender. Maxillse (PI. IX, fig. 5c) oblong; terminal joint of the palp unusually 

 short, not longer than the first, slightly longer than broad and somewhat expanded. Maxillipeds 

 (fig. ^d) robust, second joint with an oblong, very conspicuous lobe, third joint with a small 

 but distinct lobe. Gnathopods and thoracic legs (fig. §è) more slender than in Parerythrops, 

 but thicker than in Erythrops. Otherwise nearly as in Erythrops. (Male pleopods unknown). 



Remarks. — This genus is established on a single, immature female specimen, because 

 the mouth-parts present differences from those in the above-named genera. 



36. Synerythrops intcrmedia n. sp. PI. IX, figs. 50 — 5c; PI. X, figs. ia — ie. 



Stat. 185. September 12. Lat. 3°2o'S., long. i27°22'.9E. Manipa-strait. Hensen vertical net, 

 from 1536 m. to surface. 1 specimen, an immature female. 



Description. - The carapace seems to reach nearly to the end of thorax; its frontal 

 plate (PI. X, fig. 1 a) is somewhat large, very broad, subtriangular, a little more than twice 

 as broad as long, with the vertex moderately broadly rounded. Eyes of very moderate size, 

 subglobose, light reddish-brown; distal joint of the eye-stalks very much broader than long. 

 Antennal squama slightly overreaching the antennular peduncle, somewhat less than four times 

 as long as broad, with the outer margin slightly concave ; terminal lobe much broader than 

 long, overreaching the small marginal tooth. Uropods (PI. X, fig. 1 b) with the exopod not quite 

 seven times as long as broad and somewhat more than twice as long; as the telson. Telson 

 (PI. X, figs. 1 b and 1 c) slightly longer than broad, subtriangular, with the major part of the 

 lateral margins nearly straight and the end cut off transversely ; the end bears a couple of 

 strong and very long spines, between which the two usual setse are seen; the distal part of 



