10 Lysianassidae 



15 

 16 

 17 



18 



19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 



{Side-plates 1 aud 2 (Fig. 6) very small — 16. 

 Side-plates 1 and 2 not very small — 17. 



j Peraeopod 3, 2d joint deeply indentured . 15. Gen. Cyphocaris . . . . p. 28 

 \ Peraeopod 3, 2d joint uot deeply indentured 16. Gen. Cyelocaris . . . . p. 30 



j Telson entire — 18. 

 \ Telson cleft — 24. 



{Antenna 2, penultimate joint of peduncle 

 dilated 17. Gen. Lysianella . . . . p. 31 

 Antenna 2, penultimate joint of peduncle 

 not dilated — 19. 



j Uropod 3, inner ramus rudrmentary ... 18. Gen. Onesimoides . . . p. 32 

 \ Uropod 3, inner ramus not rudimentary — 20. 



{Mandible, molar well developed 19. Geu. Pseudalibrotus . . p. 33 IJ 

 Mandible, molar weak or obsolete — 21. 



f Maxillipeds, palp 4-jointed ^— 22. 



31axillipeds, palp 3-jointed — 23. 



i Maxiila 2, inner plate narrow 20. Gen. Nannonjrx . . . . p. 34 



\ Maxiila 2, inner plate broad 21. Gen. Lysianassa . . . . p. 37 



{Maxillipeds, inner plate short 22. Gen. Perrierella . . . . p. 40 

 Maxillipeds, inner plate long 23. Gen. Nonnanion . . . . p. 41 



J Telson uot deeply cleft — 25. 

 \ Telson deeply cleft — 29. 



I Mandible, palp attached over molar — 26. 

 \ Mandible, palp attached behind molar — 27. 



f Maxillipeds, 4th joint of palp short ... 24. Gen. Paratryphosites . p. 42 

 \ ]!llaxillipeds, 4th joint of palp long .... 25. Gen. Paronesimus . . . p. 43 



j Gnathopod 1 subchelate 26. Gen. Orchomene . . . . p. 44 



) Gnathopod 1 not subchelate — 28. 



{Antenna 1, 2d and 3d joints not extremely 

 short 27. Geu. Socamoides . . . p. 47 

 Antenna 1, 2d and 3d joints extremely short 28. Gen. Menigrates . . . . p. 48 



ISide-plate 1, lower front angle concealed — 30. 

 Side-plate 1, lower front angle not con- 

 cealed — 31. 



i Maxiila 1 with outer plate, maxilla 2 with 

 inner plate, very broad 29. Gen. Aristias p. 49 

 Maxilla 1 with outer plate, maxilla 2 with 

 inner plate, not very broad 30. Gen. Ambasia p. 51 



J Branchial vesicles more or less complex — 32. 

 \ Branchial vesicles simple*) — 35. 



(Branchial vesicles (Fig. 10) pleated on both 

 sides — 33. 

 Branchial vesicles pleated on one side 

 only — 34. 



30 



31 



32 



33 

 34 

 35 



f Gnathopod 1 not subchelate 31. Gen. Ichnopus . . 



\ Gnathopod 1 subchelate 32. Gen. Anonyx . . 



{Gnathopod 1, finger short 33. Gen. Socarnes . . 

 Gnathopod 1, finger long 34. Gen. Hippomedon 



f Peraeopod 3, 2d joint deeply indentured . 35. Gen. Glycerina . 

 \ Peraeopod 3, 2* j oint not deeply ind entured — 36. 



p. 52 

 p. 53 ' 



p.56 ^ 

 p. 58 f r 



p.60 



**) In Tmetonyx miersi (p. 75) not quite simple. 



