Eurystheus 613 



blackish or brownish in spirit, not large. Antennae 1 and 2 subequal, fringed 

 with long slender setae. Antenna 1, 3*^ Joint longer than 1***, nearly equal 

 to 2*^, flagellum shorter than peduncle, about 20-jointed; accessorv flagellum 

 7 — 10-jointed. Antenna 2, ultimate and peuultimate joints of peduncle 

 subequal; flagellum shorter thau peduncle, 18 — 24-jointed. Upper lip acutely 

 produced in front. Maudible, spines of spine-row numerous. Maxiila 1, 

 inner plate fringed with setae. Gnathopod 1 in d, 5*^ Joint longer but 

 rather narrower than 6*^; 6*^ widest where palm joins bind margin with 

 strong, scarcely interrupted convexity ; finger slightly overlapping palm. Gnatho- 

 pod 1 in Q, 6*^ Joint not wider than 5*^. Gnathopod 2 in ö, 4^ Joint 

 small, quadrate. 5*1^ small, cup-shaped, very short, 6*^ very large, widening 

 to the nearly transverse palm, defined by a strong tooth, near to which is 

 another conspicuous tooth of variable size, followed by a 2*^ cavity and a 

 squarish prominence; finger massive, closing down between the 2 teeth, and 

 having on its inner marglu a prominence not nearly large enough to fiU 

 the 2'^ cavity of palm, and a bulge near the hinge. Sometimes oue of the 

 gnathopods 2 is much smaller than the other, and has the 5**^ Joint relatively 

 larger, the 6*^ with less promiuently sculptured palm as in the 9. Peraeo- 

 pods 1 — 3 Short. Peraeopods 3 — 5, finger short, stout, much curved. Peraeo- 

 pod 3, 2^ Joint oval, narrowed a little distally. Peraeopod 4 much longer 

 than the precediug peraeopods, stout; 4:^^ — 6*'» joints widening with age, 2^ 

 relatively narrow, little longer than 4*'* or 6*^ oblong, but with bind margin 

 couvex above and below the concave middle part. Peraeopod 5 subequal to 

 4*^ in length, less broad, 2^ Joint oblong, sinuous bind margin serrate, 

 produced subacutely downward. Branchial vesicles naiTow at base, broadly 

 rounded distally. Cropod 3 short, the subequal rami nearly as long as 

 peduncle. Telson small, as broad as long, apical border with an acute 

 central projection, a spine on each of the pair of subapical, sublateral 

 elevations. L. 8 mm. 



Port Jackson and Jervis Bay [East-AustraliaJ. 



5. E. thomsoni (Stebb.) 1888 Gammaropsis t., T. Stebbing in: Rep. Voy. 



Challenger, v.29 p.ll03 t.ll5 | 1893 Protomedeia? afra(p&Tt.), 

 A. Della Valle in : F. Fl. Neapel, v. 20 p. 440. 



5 . Pleon Segments 4 and 5 with medio-dorsal 

 emargination, 4*^ with a small tooth in centre of 

 emargination. Head. lateral lobes naiTOw, subangular. 

 Side-plate 1 a little produced forward, obtusely, 2*^ much 

 larger, about as broad as deep. Pleon segment 3, 

 postero-lat^ral corners fonning a slightly upturned tooth, 

 bind margin bulging above. Eyes rather large, close - 

 to margin of head. Antennae 1 and 2 broken. Upper 

 lip slightly and unsymmetrically bilobed. Gnathopod 1, 

 5*^ Joint longer than 6*^ spinöse behind; 6*^ spinöse 

 on both sides, oval, more convex behind than in 

 front; palm finely pectinate, slightly defined; finger 

 long, serrate, closely fitting the palm. Gnathopod 2, 

 2d Joint not expanded, 5'^ triangulär, cup-shaped; ^^^ '" PerSopo^dT"'' ^ ' 

 6*^ large, widening to the palm, which is long, oblique, 



denticulate, 2 of the teeth prominent, the defining angle obtuse, canying 

 palmar spines, finger almost smooth, mätching the palm. Peraeopods 1 

 and 2 (Fig. 106) glandulär, of the usual pattern. Peraeopods 3 — 5, 2^ Joint 



