606 Photis 



P., G. O. Sars, Crust. Norway, v.l p. 568 | 1862 Eiscladus (Sp. un.: E. longicaudatus)^ 



Bäte & Westwood, Brit. sess. Crust., i;. 1 p. 411 | 1869 Heiscladus, A. M. Norman int 



Kep. Brit. Ass., Meet. 38 p. 255, 259, 284 | 1874 Heiscladius, M'Intosh in: Ann. nat. 

 Hist., ser. 4 v. 14 p. 269. 



Body smooth. Head, lateral lobes somewhat produced. Side-plates 1 — 5 

 rather large, 5^^ scarcely less deep tlian the preceding pairs. Eyes on lateral 

 lobes of head. Antennae 1 and 2 subequal, peduncle eloiigate. Antenna 1 

 with 3*^ Joint subequal to 1^*, a mdiment of accessory flagellum sometimes 

 present. Mouth-parts as in Eurystheus (p. 610), except that 3*^ Joint of 

 mandibular palp is less elougate. Gnathopods 1 and 2 stronger in ö than 

 in Q , 2*^ stronger than 1^*, with short 5*^ Joint. Peraeopod 3 sbort, uptunied, 

 2^ Joint broad, finger.veiT short, clasped against apex of 6*^ Joint, and having 

 a denticle on its outer margin. üropod 3 (Fig. 103), rami very unequal, 

 the outer having 2 joints, 2*^ minute; the inner ramus very small. Telson 

 (Fig. 103) small, broad er than long. 



5 species accepted, 1 obscure. 



Synopsis of accepted species: 



{Lateral lobes of head little produced; uropod 3, 

 outer ramus not longer than peduncle — 2. 

 Lateral lobes of head much produced; uropod 3, 

 outer ramus longer than peduncle — 4. 



f Peraeopod 3, 2d Joint widened distally 1. P. brevicaudata . p. 606 



\ Peraeopod 3, 2d Joint narrowed distally — 3. 



f Gnathopod 1, öth Joint longer than öth 2. P, reinhardi . . . p. 607 



l Gnathopod 1, 6tli Joint not longer than 5tli ... 3. P. macrocarpa . p. 607 



j Body slender, side-plates not very deep 4. P. longieaudata . p. 608 



\ Body stout, side-plates very deep 5. P. tenuicornis . . p. 608 



1. P. brevicaudata Stebb. 1888 P.b., T. Stebbing in: Rep. Voy. Challenger, 

 V.29 p.1068 1. 108 I 1893 P. reinhardi (part.), A. Della Valle in: F. Fl. Neapel, t\20 p.395. 



9 . Head, lateral lobes acute, little produced. Side-plates 1 — 5 very 

 deep, 5**^ scarcely less deep than 4*^ and much broader. Pleon segment 3^ 

 postero-lateral corners obtusely quadrate. Eyes small, round, dark, lenses 

 numerous. Antenna 1, 3* Joint intermediate in length between 1^* and 

 longer 2^, flagellum shorter than peduncle, 7- or 8-jointed. Antenna 2, 

 ultimate and penultimate joints of peduncle equal, flagellum 6-jointed. 

 Gnathopod 1, 5*^ Joint stout, rather shorter than the oval 6**; palm fiuely 

 pectinate, continuous with bind margin, only defined by the palmar spines; 

 finger with 4 decurreut teeth. Gnathopod 2, 5*^ Joint as usual short, cup- 

 shaped; 6*^ broad, oblong oval, palm obliquely excavate, defined by a palmar 

 spine at the well marked angle; finger dentate, matching palm. Peraeopods 1 

 and 2 rather stout and setose; 6*^ Joint not very slender, not 1^2 as long 

 as 5*^ Peraeopod 3, 2^ Joint as broad as long, widened distally; 5*^ Joint 

 rather longer than 4*^. Peraeopod 4, 2*^ Joint as long, but not quite as 

 broad as in peraeopod 3, remaining joints longer than in peraeopod 3. 

 Peraeopod 5 little longer than peraeopod 4, 2^ Joint considerably narrower. 

 üropod 3, outer ramus rather shorter than peduncle, its 2*^ Joint tipped with 

 a long spine. Telson very short, much broader than long, apex rounded. 

 L. less than 4 mm. 



Off Melbourne. Depth 60 m. 



