LIST OF ILLUSTRATIONS. XIX 



Page. 



164. Gecarcinus lagostoma, outer maxilliped, Ascension Island, slightly reduced. 



a, Upper view; b, lower view. (After Miers.) 361 



165. Gecarcinus lagostoma, abdomen of male (14869), natural size 362 



166. Uca mordax, inner surface of larger chela of male from Para, slightly re- 



duced. (After Smith.) 392 



167. Uca gahpagensis, male (22319), X 1^. a, Dorsal view; b, inner surface 



of larger chela 403 



168. Uca rectikitus, cotype, enlarged, after Holmes. o,Dorsal view of carapace, 



eyes and legs; b, ischium and merus of right outer maxilliped; c, carpus 

 and chela of smaller cheliped; d, merus of right or larger cheliped, inner 

 face; e, larger chela, inner face 406 



169. Uca thuyeri, male (23753), natural size, a, Dorsal view; b, inner surface 



of larger chela 407 



170. Uca hellen, male, X 3. a, Dorsal view of holotype; b, inner surface of 



larger chela (25666) 415 



171. Uca musica, male holotype, X 3J. a, Lower view of larger, left chela, 



showing stridulating ridge; 6, anterior (lower) view of portion of first 



left leg, showing granules which play against stridulating ridge 418 



172. Prehistoric bowl unearthed in Costa Rica, the base representing a female 



land crab, Cardisoma guanhumi, with the claws folded under the eyes, 

 X about |. Original in possession of Mrs. Zeledon, cast in U. S. National 

 Museum 424 



PLATES. 



1. Trizocarcinus dentatv-?. 



2. Baihyplax typhla. 



3. Pilumnoplax elata. 



i. Goneplax barbata and sigsbei. 



5. Goneplax barbata. 



6. Prionoplax atlantica and Tetraplax quadridentata. 



7 . Euryp lax nitida . 



8. Speocarcinus carolinenHis . 



9. Speocarcinus granulimanus. 



10. Speocarcinus ostrearicola and cali/orniensis. 



11. Cyrtoplax spinidentata. 



12. Panoplax depressa and Eiuratopsis crassimanus . 



13. Oediplax granulata and Glyptoplax smithii. 



14. Chasmocarcinus obliquus and Pseudorhombila octodentata. 



15. Pinnotheres holmesi and ostreum . 



16. Pinnotheres geddesi and angelicas. 



17. Pinnotheres depressus. maculatus, and pugettensis. 



18. Pinnotheres pugettensis and muliniarum. 



19. Pinnotheres serrei and barbatus. 



20. Pinnotheres strombi and concharum. 



21. Pinnotheres reticulatus, moseri, and taylori. 



22. Pinnotheres shoemakeri and orcutti. 



23. Pinnotheres hemphilli. 



24. Fabia subquadrata, lowei, canfieldi, and byssomiae. 



25. Pinnaxodes meinerti and Parapinnixa bouvieri. 



26. Parapinnixa hendersoni and Dissodactylus nitidus. 



27. Dissodactylus encopei and borradailei. 



28. Dissodactylus stebbingi, alcocki, cahnani, and mellitae. 



