236 Oedicerotidae 



Side-plates of raoderate size, fringed witli setae. Pleon segmeuts 1 — 3, 

 postero-lateral corners usually rounded. Eyes (Fig. 61, 62), when present and 

 distinctly developed, usually contiguous, approximate or wholly confluent, dorsal 

 and more or less frontal. Antenna 1 (Fig. 61, 67) with accessory flagellura absent 

 or rudimentary. Epistome not projecting. Upper lip not bilobed. Lower lip 

 with inner lobes separate or coalesced. Mandible, molar variable, palp usually 

 large. Maxillipeds, plates well developed, but seldom large. Gnathopod 1 

 (Fig. 65) subchelate. Gnathopod 2 (Fig. 66) subchelate or rarely chelate. 

 Peraeopods 1 — 4 (Fig. 63), 4*** Joint moderately large. Peraeopods 3 and 4, 

 2^ Joint elliptic, fringed with plumose setae. Peraeopod 5 (Fig. 64) very 

 long, 2*^ Joint expanded, 7*^ stiliform. Branchial vesicles usually simple, large. 

 Uropods 1 — 3 commonly extending equally far back. Telson small, entire. 



Marine; raany species are known as sand-burrowers. 

 18 genera, 56 accepted species and 6 doubtful. 



Synopsis of genera: 



( Eyes coiopletely confluent, without median 

 1 : line of demarcation — 2. 



l Eyes not completely confluent — 3. 

 ^ J Eyes (Fig. 61) not prominent 1. Gen. Perioculodes . . . p. 237 



) Eyes (Fig. 62) prominent 2. Gen. Gulbarentsia . . . p. 238 



iEyes not contiguous, though distinctly 

 developed 3. Gen. Exoediceros . . . p. 239 

 Eyes, when distinctly developed, conti- 



guous or approximate — 4. 



I 



. Gnathopod 2 chelate — 5. 



^ Gnathopod 2 (Fig. 66) subchelate — 6. 



J Mandible, molar normal 4. Gen. Pontocrates . . . . j). 239 



\ Mandible, molar degraded 5. Gen. Synchelidium • . . p. 241 



I Mandible, molar without triturating sur- 

 6 •[ face — 7. 



l Mandible, molar with triturating surf ace — 8. 



j Gnathopods 1 and 2 alike in structure . 6. Gen. Oediceros p. 243 



\ Gnathopods 1 and 2 unlike in structure 7. Gen. Paroediceros . . . p. 245 

 Uropod 3 much longer than uropods 1 and 2 8. Gen. Halicreion .... p. 247 

 Uropod 3 not longer than uropods 1 and 2 — 9. 

 f Mandible, 2d joint strongly curved — 10. 

 ) Mandible, 2djoint not strongly curved — 12. 

 j Front of the head not produced .... 9. Gen. Arrhis p. 248 



{ 



\ Front of the head produced — 11. 

 f Gnathopods 1 and 2, palm very oblique 10. Gen. Westwoodilla . . . p. 249 

 \ Gnathopods 1 and 2, palm nearly transverse 11. Gen. Carolobatea . . . . p. 252 

 f Front of the head not produced .... 12. Gen. Oediceropsis . . . p. 252 

 \ Front of the head (Fig. 67) produced — 13. 



J Back multicarinate 13. Gen. Acanthostepheia . p. 253 



\ Back not multicarinate - 14. 



(Eyes (Fig. 67) wanting or not placed on 

 rostral protection — 15. 

 ■^* 1 Eyes or ocular pigment on rostral pro- 

 ' jection — 16. 

 Peraeopods 1 and 2 (Fig. 63) with widened 



15 •{ joints 14. Gen. Aceroides p. 254 



Peraeopods 1 and 2 without widened joiuts 15. Gen. Bathymedon . . . p. 255 



