366 



Gammaridae 



24 



25 



26 



27 



28 



29 



30 



31 

 32 

 33 



34 



35 

 36 



37 



38 

 39 

 40 

 41 

 42 



43 



Grnathopods 1 and 2 subequal . . . 23. 



Gnathopod 1 much strouger than gna- 

 thopod 2 24. 



Gnathopod 2 not larger than gna- 

 thopod 1 — 26. 



Gnathopod 2 larger than gnatho- 

 pod 1 — 27. 



Uropod 3, peduncle shorter than outer 

 (1-jointed?) ramus 25. 



Uropod 3, peduncle as long as outer 

 (2-jointed) ramus 26. 



Mandible, 2d Joint of palp shorter 



than Ist 27. 



Mandible, 2d Joint of palp longer 



than Ist _ 28. 

 Uropod 3, rami narrowly lanceolate . 28. 

 Uropod 3, rami laminar, apically 



rounded 29. 



Body not at all or scarcely carinate — 30. 

 Body distinctly carinate — 46. 

 Body without groups of dorsal spi- 



nules — 31. 

 Bodywithgroupsof dorsal spinules — 40. 

 Uropod 3 large — 32. 

 Uropod 3 not large — 36. 

 Uropod 3, rami very unequal .... 30. 

 Uropod 3, rami not very unequal — 33. 



Antenna 2 stout 31. 



Antenna 2 slender — 34. 



Maxillae 1 and 2 with inner plate very 



setose 32. 



Maxillae 1 and 2 with inner plate not 



very setose — ■ 35. 



Peraeopods 3 — 5 slender 33. 



Peraeopods 3 — 5 robust 34. 



Uropod 3, rami equal 35. 



Uropod 3, rami unequal — 37. 

 Peraeopods 1 — 5, 6^^ Joint apically 



widened 36. 



Peraeopods 1 — 5, 6tli Joint not apically 



widened — 38. 

 Lower lip without inner lobes . . . 37. 

 Lower lip with inner lobes — 39. 

 Antenna 1 long, with long peduncle 38. 

 Antenna 1 short, with short peduncle 39. 



Without eyes 40. 



With eyes — 41. 



Eyes (Fig. 86) of irregulär form . . . 41. 



Eyes of regulär form — 42. 



Side-plate 5 dentately produced . . 42. 



Side-plate5notdentatelyproduced — 43. 



Pleon Segments 4 and 5 each raised 



dorsally to a spiniferous tubercle 43. 

 Pleon Segments 4 and 5 not raised 



dorsally to a spiniferous tubercle — 44. 



Gen. Qmelina . . 

 Gen. Gmelinopsis 



p.412 

 p.414 



Gen. Melita p. 421 



Gen. Paraceradocus . . . . p. 429 



Gen. Ceradocus p. 430 



Gen. Maera 



Gen. Elasmopus . . . 

 Gen. Plesiogammarus 



Gen. Iphigenella . 



p.433 

 p.441 

 p.446 



p.447 



Gen. Pandorites i p. 448 



Gen. Pherusa p. 449 



Gen. Niphargoides . . . . p. 450 

 Gen. Phreatogaminarus . . p. 453 



Gen. Ommatogainniairus . . p. 454 



Gen. Odontogammarus . . p. 456 



Gen. Dikerogammarus . . . p. 458 



i.1-!)T'iiit:': - ir^SSSX^Miälli 



