641 
INDEX TO PHYLOGENY OF AN ACQUIRED CHARACTERISTIC. 
Abiogenesis, 390 
Acanthoceras Rémondi, 
565 
Acceleration, law of, 373, 
374 
Acleistoceras, 585 
Acme, 393, 397 
Acquired characters, 407 
Actinoceras, 403, 404 
Adelphoceras, 519 
secundum, 493, 519 
bohemicum, 519 
/Egoceras, 446 
Agassiz, Alex., 370 
Louis, 353, 390, 402 
Agoniatites fecundus, 362, 
609 
Aipoceras, 545 
Anagerontic, 391 
Anaplasis, 391, 393, 397, 
398 
Ananeanic, 391, 406, 407, 
408 
Ananepionic, 391, 405, 
4II, 412, 414, 418, 436, 
468, 583 
Anarcestes, 414 
Ancistroceras, 509 
Bolli, 510 
undulatum, 510, 51I 
Dyeri, 511 
Ancyloceras calloviense, 
372, 614 
Jennyi, 573, 577 
lineatus, 577 
PROC. AMER. PHILOS. SOC. XXxII. 148. 4c. 
Ancyloceras percostatum, 
569 
tricostatus, 574 
uncum, 577 
Anephebic, 391 
Angelinoceras, 457, 458, 
508 
anguinum, 508 
latum, 508, 512 
Annular lobe, 361, 408, 
429 
Annular cone, 429 
Annular muscle, 429 
Ammonitinz, 355, 371, 
372, 415, 416 
Ammonites ' bifurcatum, 
566 ; 
Ammonoceratites Con- 
radi, 569 
Ammonoidea, 352, 358, 
359, 361, 368, 370, 371, 
373, 374, 376, 378, 385, 
410, 413, 416, 417, 418, 
431 
Anomaloceras, 494 
anomalum, 494, 599, 
607 
Apertures, 353 
Apheleceras, 528, 539 
mutabile, 539, 602 
Aphetoceras, 433, 447,593, 
594 
americanum, 447,593 
attenuatum, 449 
boreale, 448, 592 
Aphetoceras Farnsworthi, 
448 
Apsidoceratidze, 535 
Argonauta, 356, 357, 358 
Arietidz, 367, 371, 374 
Artemia, 389 
Ascoceras, 513 
Asiphonula, 403 
Asymptoceras, 528, 545 
Aturia, 563 
Morrissi, 564 
Zizac, 564 
Auiacoceras, 355, 356 
Autotemnon, 399 
Auxology, 380, 381, 390 
Avolution, 394 
Bactrites, 361, 362, 
412, 413, 590, 609 
Baculites, 372, 373, 377; 
395, 411, 417, 477, 
566, 579, 612 
baculoides, 578 
Barrande, 356, 359, 365, 
366, 369, 371, 372, 413, 
513 
Barrandeoceras, 351, 379, 
408, 409, 433, 450, 
454, 600 
bohemicum, 600 
convolvans, 451, 601 
Minganense, 451 
natator, 452 
Sacheri, 453, 600 
368, 
PRINTED OCTOBER 13, 1894. 
