Platyischuopus 123 



spine-teeth on inuer margm, reaching beyond long 2'^ Joint of palp. Gnatho- 

 pods 1 and 2 long and slender, distinctly chelate, or gnathopod 1 nearly simple, 

 2*^ and 5^^ joints elongate. Peraeopods 1 and 2 small, 4'^'^ Joint longer than 

 ^thfyy Qt\ Peraeopod 3, 2^, 4*^ and ö*^!! joints more or less widened. Pevaeo- 

 pod 4, 2^^ Joint oval, 4^^ and 5*^ much expauded. Peraeopod 5, 2^ Joint 

 much broader than long, 4*^'^ and 5^^ well expanded. üropod 1, outer ramus 

 a little, uropod 2 (and probably uropod 3), outer ramus much longer than 

 inner. Telson rather longer than broad, widely eraarginate at apex or 

 deeply cleft. 



The liood-like shape of head and the 1-jointed palp of maxilla 1 approximate 

 this anomalous genus to the Phoxocephalidae (p. 133), the long, slender, chelate 

 gnathopods 1 and 2 and the emarginate telson to some Acanthonotozomatidae (p. 210). 



2 species. 



Synopsis of species: 



<Tnathopods 1 and 2, 3d Joint elongate 1. P. mirabilis . . . p. 123 



Onathopods 1 and 2, 3d Joint very short 2. P. neozelanicus . p. 123 



1. P. mirabilis Stebb. 1888 P.m., T. Stebbing in: Rep.Voy. Challenger, r.29 

 p. 830 t. 58 j 1893 Platyschnopns m., A. DellaValle in: F. Fl. Neapel, r. 20 p. 785 

 t. 60 f. 36. 



Head longer than peraeon segments 1 — 3 combined. shallower where 

 tlie small, round, dark eyes are placed than before or behind them (Fig. 31). 

 Rostrum pointed. Pleon segment 3, postero-lateral angles produced into 

 a small, acutely upturned point. In antenna 1 and 2 all the flagella slender, 

 1^* Joint longest. Gnathopod 1, 3*^ Joint elongate, 6^'' Joint the widest 

 of all, rather shoiier than the 5^^. its front margin much shorter than the 

 hinder, being thus produced into an acute tiiangle for antagonism with the 

 small nail-tipped finger. Gnathopod 2, all the joints except the finger 

 longer than in gnathopod 1, 6^'^ Joint rather more tlian half as long as 5*'^, 

 the chela-forming process shorter and sharper than in gnathopod 1. Peraeo- 

 pods 1 and 2, 4*'' Joint rather long and broad, finger slender, tapering. Peraeo- 

 pods 3 — 5, 4^'* and 5^^^ joints with many groups of spines; in peraeopod 3 

 2'^ Joint widened below, in peraeopod 4 regularly and rather broadly oval, , 

 in peraeopod 5 partially fused with the side-plate, twice as broad as long, 

 with acute hinder angle. Peraeopod 5, 4**^ and 5*'» joints greatly expanded. 

 Uropod 3, peduncle rather stout, much longer than one of the rami, the 

 other ramus unknown. L. about 8 mm. 



Port Jackson [East-Australia], depth 4 — 19 m; tropical Atlantic (liarbour of Bahia). 



2. P. neozelanicus Ohilton 1897 P. »., Chilton in: Ann. nat. Hist., ser. 6 

 V. 19 p. 1 t. 5. 



Body rather broad, chiefly at peraeon. Head and position of antenuae as in 

 P. mirabilis. Antenna 1 rather shorter than antenna 2, peduncle longer than 

 flagellum, 2*^ Joint a little longer than 1***. oblong, with 4 or 5 long plumose setae, 

 flagellum 5-jointed, accessory flagellum 3-jointed. Antenna 2, peduncle stoiit, 

 flagellum apparently about as long as ultimate Joint of peduncle. Mouth-parts 

 not precisely known. Gnathopod 1, 2'^ Joint ending in 2 long setae, 3'^ short. 

 5*^ longer and wider than ßt'i, setose on sinuous bind margiu, 6^^ slightly 

 widened distally, with long setae on distal half of bind margin, no distinct 

 palm, finger rather small. Gnathopod 2 similar in general shape but rather 

 longer, F)^^ Joint twice as long as G*^ and widened near the base, 6*^ produced 



