FIG. 359. Line of day and numeral symbols from Plates 36_c_ and 37_c_, Dresden Codex 272 360. Line of day and numeral characters from Plates 33-39, Dresden Codex 276 361. Unusual symbol for Akbal from Plate 8 of the Dresden Codex 284 362. Copy of Plate 50, Dresden Codex 297 363. Copy of Plate 51, Dresden Codex 306 364. Copy of Plate 52, Dresden Codex 307 365. Copy of Plate 53, Dresden Codex 308 366. Copy of Plate 54, Dresden Codex 309 367. Copy of Plate 55, Dresden Codex 310 368. Copy of Plate 56, Dresden Codex 311 369. Copy of Plate 57, Dresden Codex 312 370. Copy of Plate 58, Dresden Codex 313 371. Specimens of ornamental loops from page 72, Dresden Codex 337 372. Numeral character from the lower division of Plate XV, Manuscript Troano 343 373. Turtle from the Cortesian Codex, Plate 17 348 374. Jar from the Cortesian Codex, Plate 27 349 375. Worm and plant from Manuscript Troano, Plate XXIX 351 376. Figure of a woman from the Dresden Codex 351 377. Copy of middle and lower divisions of Plate XIX, Manuscript Troano 352 378. Copy of lower division of Plate 65, Dresden Codex 353 379. The moo or ara from Plate 16, Dresden Codex 355 380. The god Ekchuah, after the Troano and Cortesian Codices 358 381. The long nosed god (Kukulcan) or god with the snake-like tongue 359 382. Copy of head from the Borgian Codex (Quetzalcoatl?) 360 383. The supposed god of death from the Dresden Codex 361 384. The supposed god of death from the Troano Codex 361 385. The god with the banded face from the Troano Codex 362 386. The god with the old man's face 363 387. The god with face crossed by lines 364 388. Wooden idol in vessel with basket cover 371 AIDS TO THE STUDY OF THE MAYA CODICES. BY CYRUS THOMAS. INTRODUCTION. The object of this paper is to present to students of American paleography a brief explanation of some discoveries, made in regard to certain Maya codices, which are not mentioned in my previous papers relating to these aboriginal manuscripts.