Paradryope, Photidae 603 



outer ramus shorter than inner, üropod 3, peduncle broad, reaching well 

 beyond the telson, rami narrow, almost acute. Telson a little longer than 

 broad, apex obtuse, a little produced; a spinule near centre of each lateral 

 margin. L. about 5 mm. 



North-Pacific (lat. 36« N., long. 158 »E.). Depth of 4200 m. 



34. Farn. Photidae 



1872 & 76 Photidae (part.), A. Boeck. Skand. Arkt. Amptip., v. 1 p. 74; v.2 

 p. 546 ! 1882 F., G. O. Sars in: Forh. Selsk. Christian., nr. 18 p. 29 1 1888 P. (part), 

 T. Stebbing in: Kep. Voy. Challenger, v.29 p. 1061 | 1894 P. (part.), G. 0. Sars, Crust. 

 Norway, v. 1 p. 538. 



Head, lateral lobes often slightly produced. Side-plates variable in 

 depth and relative size, 2*^ not unfrequently the largest, 4*^ with bind margin 

 not excavate. Antenna 1 often subequal to antenna 2, sometimes longer; 

 accessory flagellum varying from obsolete to long. Mouth-parts normal and 

 in general as in the Aoridae (p. 585), but: mandibular processes of lower 

 lip not acutely produced, 3*^ Joint of mandibular palp usually not longer 

 than 2"^, inner plate of maxilla 1 with a variable number of setae. Gnatho- 

 pods 1 and 2 (Fig. 104, 105, 107; p. 610, 614) either subchelate or simple, 

 but gnathopod 1 not the larger, and sexual difference chiefly affecting 

 gnathopod 2. Peraeopods 1 and 2 (Fig. 106 p. 613) glandulär. Peraeo- 

 pods 4 and 5 longer than the rest. üropods 1 and 2 biramous. üropod 3 

 biramous except in Microprotopus (p. 604). Telson simple (Fig. 103 p. 607). 



Marine. 



10 genera, 38 accepted species and 5 donbtful. 



Synopsis of genera: 



/ Üropod 3 with only 1 ramus 1. Gen. Microprotopus . p. 604 



\ üropod 3 with 2 rami — 2. 



üropod 3 (Fig. 103) with one ramus much 



smaller than the other — 3. 

 üropod 3 with the rami not very unequal — 4. 



Gnathopods 1 and 2 subchelate 2. Gen. Photis p. 605 



Gnathopods 1 and 2 (Fig. 104, 105) simple . 3. Qen. Haplocheira . . p. 609 



Antenna 1, 3d Joint longer than Ist or subequal 



to it — 5. 

 Antenna 1, 3d Joint shorter than Ist — 7. 



( Antenna 1, accessory flagellum well developed 4. Gen. Eurystheus . . p. 610 

 ö < Antenna 1, accessory flagellum rudimentary or 

 l obsolete — 6. 



J Gnathopod 2, 5th Joint short 5. Gen. Podoeeropsis . . p. 618 



\ Gnathopod 2, 5tli Joint long 6. Gen. Megamphopus . p. 621 



j Antenna 1, accessory flagellum obsolete ... 7. Gen. Goesia p. 622 



\ Antenna 1, accessory flagellum developed — 8. 



