Allorchestes 583 



margins at widest part, 6*^ widening to a palm-like angle, a part of the 

 sinuous bind margin being adapted to rest on hind process of 5**^ Joint, the 

 margin then abruptly turning to join the short spinulose palm, which is 

 exactly fitted by the stout 2-pointed tinger. Gnathopod 2 in 6' (Fig. 99), 

 2^ Joint with no conspicuous distal lobe, 4*^ produced but not acute, 5*^ 

 produced into a shallow cup-forming fringed process, 6*^ oval, finger closing 

 over an oblique, almost straight palm into the usual pocket, armed with 2 

 palmar spines, the hind margin not at all bulging, canying spinules at 2 

 points. Gnathopod 1 in Q , 6*^ Joint oblong, 

 slightly widening to transverse palm, hind margin C~P^iy^ \ 



sinuous, finger acute, closelyfitting palm. Gnatho- //l ]{ 1 



pod 2 in 9, 4**1 Joint subacutely produced, 5**^ 5">joiiit \^^^r'^\\^ / 

 with broad fringed process produced partly aloug 4«" joint -"^Ql/ ^\~^^^^ 

 hind margin of 6*^ Joint, which is oblong, hind ß'" Joint --- -^^x;^;,.«;^ 

 margin straight, finger acute, scarcely reaching Fig. 99. Fig. 100. 



end of transverse palm. In young from marsupium . Gnathopod 2. (^. Teison. 



gnathopods 1 and 2 have a general resemblance ^^^' ^^ * ^^^' ^' ™**^®°^"^- 



to gnathopod 1 in 9 . Marsupial plates of gnathopod 2 and peraeopod 1 have 

 one distal corner subacutely produced, in peraeopod 2 they end squarely; in all 

 the fringing setae are short. Peraeopods 1—5 not strongly spined, finger 

 curved. Peraeopods 3 — 5, 2*^ Joint oblong oval, the front margin nearly 

 straight, hind margin produced downward in rounded lobe; in peraeopod 3 

 at least as broad and about as long as in the longer peraeopod 4; in 

 peraeopod 4 more oblong than oval, widest proximally; in peraeopod 5 

 much broader, widest distally. Peraeopods 3—5 in 9 shorter and stouter 

 than in ä , 4*^ Joint widened distally. Pleopods with 2 or 3 simple coupling 

 hooks, and on inner margin of P* Joint of inner ramus 4 or 5 spines not 

 cleffc but at apex a little dilated and hooked. Uropod 3 small, ramus 

 ishorter than peduncle. Teison (Fig. 100) nearly Square, with slightly convex 

 sides, median cleft not reaching beyond middle, its sides not divergent. 

 L. about 7 mm. 



Yellow Sea, Sea of Japan. In sea-weed. 



4, A. plumieornis (Heller) 1866 Nicea p., Cam. Heller in: Denk. Ak. Wien, 

 v. 26ii p. 5 t. 1 f. 8, 9 I \S^^ Allorchestes p., T. Stebbing in: Tr. Linn. Soc. London-, ser. 2 

 V. 7 p. 412 t. 33 C i 1893 Hyale prevostii (part.), A. Della Valle in : F. Fl. Neapel, v. 20 p. 519. 



Body compressed. Eyes an elongate round. Antenna 1 reaching nearly to 

 the middle of flagellum of antenna 2, 1^* Joint longer than 2^ or 3"^, flagellum 

 with 18 or 19 successively lengthening joints. Antenna 2, flagellum longer 

 than peduncle, with 22 joints, tenuinal joints of peduncle and first half of 

 flagellum beset on underside with long fascicles of setae. Maxilla 1, palp 

 reaching base of spines of outer plate. Maxillipe'ds, penultimate Joint of 

 palp setose, ultimate long, acute. Gnathopod l in d, 4*^ Joint with blunt 

 produced point, 5**» with broad distal fringed lobe, 6*^ oblong oval, rather 

 longer than 5*^, palm oblique, spinulose, finger somewhat thickened, its outer 

 margin abruptly curving to an acute apex. Gnathopod 2 in d much larger, 

 4*^ Joint bluntly produced, 5* veiy short, but wide, embracing base of 6**^, 

 which is oval, with small group of spinules on hind margin, palm oblique, 

 well defined by angle and palmar spines, finger strong, acute, much curved. 

 Peraeopod 5 like peraeopod 4, but rather longer, 6**1 Joint slender, straight, 

 finger acute, little curved, setule of inner margin prominent as in all the 

 peraeopods. üropods 1—3, all the rami with marginal spines. Uropod 3, 



