604 Photidae, Microprotopus 



f Gnathopod 2 subchelate 8. Gen. Protomedeia . . p. 623 



\ Gnathopod 2 simple — 9. 



/ Gnathopod 2, 5tli Joint broadly expanded to 



9 < the front 9. Gen. Xenocheira . . p. 624 



l Gnathopod 2, 5th Joint not broadly expanded . 10. Gen. Leptocheirus . . p. 625 



1. Gen. Microprotopus Norm. 



1852 Dercothoe (part.), J. D. Dana in: Amer. .1. Sei., ser. 2 v. U p. 313 | 1853 D. 

 (part.), J. D. Dana in: U. S. expl. Exp., v. 13ii p. 911, 968 | 1867 Microprotopus (8p. un. : 

 M. maculatus), A. M. Norman in-: Eep. Brit. Ass., Meet. 36 p. 197, 203 | 1893 M., A. Della 

 Valle in: F. Fl. Neapel, f. 20 p. 391 | 1894 M., G. 0. Sars, Orust. Norway, v.l p. 566 | 

 1879 Orthopalame (Sp. un.: 0. terschellingi), Hoek in: Tijdschr. Nederl. dierk. Ver., 

 V. 4 p. 123. 



Head, lateral lobes moderately produced, post-antennal corners well 

 marked. Side-plates rather large, 5*^ with deep front lobe. Antennae 1 

 and 2 not very elongate, nor very unequal. Äntenna l with accessory 

 flagellum. Gnathopod 2 especially large in the d. Peraeopods 1 and 2, 

 2* Joint a little expanded. Peraeopods 3 — 5, 2*^ Joint broadly oval. Uropod 3 

 with a Single ramus tipped with spines. Telson small. 



2 species accepted, 3 obscure. 



Synopsis of accepted species: 



Antenna 2, flagellum more than 3-jointed 1. M. maculatus . . p. 604 



Antenna 2, flagellum not more than 3-jointed 2. M. longimanus . p. 605 



1. M. maculatus Norm. 1867 31. m., A. M. Norman in: Rep. Brit. Ass., 3ieet.36 

 p. 203 j 1868 M. m., A. M. Norman in: Ann. nat. Hist., ser. 4 u 2 p. 419 t. 23 f. 7—11 ] 

 1874 M. m., T. Stebbing in: Ann. nat. Hist., ser. 4 v. 14 p. 13 t. 2 f. 5 | 1876 M. m., A. 

 Boeck, Skand. Arkt. Amphip., v.2 p. 559 t. 26 f. 3 | 1889 M. m., Hoek in: Tijdschr. 

 Nederl. dierk. Ver., ser. 2 v.2 p. 224 | 1890 M.ni., Ohevreux in: Bull. Soc. zool. France, 

 V. 15 p. 148 f. 2, 4, 6, 7 | 1893 M. m., A. Della Valle in: F. Fl. Neapel, v. 20 p. 393 t. 56 

 f. 13—16 1 1894 M. m., G. 0. Sars, Crust. Norway, v. 1 p. 567 t. 201 | 1898 M. m., Sowinski 

 in: Mem. Soc. Kiew, u 15 p. 470 | 1879 Orthopalame terschellingi, Hoek in: Tijdschr. 

 Nederl. dierk. Ver., i\ 4 p. 123 t. 9 f. 4—7. 



Body, dorsum broadly rounded. Side-plates 1 — 4 strongly setiferous, 

 1^* and 2*^ wider in ö than in 9 . Pleon segment 3, postero-lateral corners 

 broadly rounded. Eyes round, small, dark. Antenna 1 about '/a ^s long 

 as body, 1^* Joint subequal to 2<^, nearly twice as long as 3^; flagellum little 

 longer than peduncle, 8 — 10-jointed; accessory flagellum with 2 joiuts, 

 2* minute. Antenna 2 subequal to antenna 1, ultimate and penultimate joints 

 of peduncle subequal, flagellum longer than ultimate Joint of peduncle, 

 5 — 7-jointed. Gnathopod 1 rather small, 5*^ Joint rather long and nan-ow, 

 setose on bind margin, 6*^ Joint about as long, narrowly oval, more widened 

 distally in d than in o, palm defined by an obtuse angle. Gnathopod 2 

 in ö, 3*1 Joint longer than P^; 5*^ short, broad, cup-shaped; 6*^ very large 

 and long, front convex, bind or palmar margin straight between a projecting 

 basal and a distal tooth: between the latter and the finger-hinge is a cavity; 

 finger very long, slightly sinuous, reaching basal tooth of 6*^ Joint. Gnatho- 

 pod 2 in 9 stouter than gnathopod 1; 4*^ Joint longer than 5*^ the 4**> 

 and the cup-shaped 5*^ Joint being each produced into a strongly setose 

 lobe; 6**1 broader than in gnathopod 1 and palm more defined. Uropod 3, 

 peduncle rather stout, ramus subequal to it in length, narrow, tipped with setules 



