CONTENTS OF VOLUME 111. 
Pages. 
Preface, .. .. .. .. .. .. .. .. 
Introduction, . . . . . . . . . . . . . . . . 1-96 
Rocks of the Helderberg mountains, .. .. .. .. .. 97-98 
Crinoidea and Cystidese of the Lower Helderberg limestones and 
Oriskany sandstone, . . . . . . . . . . . . .. 99 - 152 
Brachiopoda of the Lower Helderberg group, .. . . . . 153 - 262 
Lamellibranchiata of the Lower Helderberg group, . . . . 263 - 291 
Gasteropoda of the Lower Helderberg group, . . . . . . 292 - 341 
Cephalopoda of the Lower Helderberg group, . . . . . . 342 - 348 
Articulata of the Lower Helderberg group, . . . . . . 349 
Crustacea of the Lower Helderberg group, . . . . . . . . 350 - 381 
Crustacea of the Waterlime group, .. .. .. . . .. 382 - 422* 
Oriskany sandstone, .. .. .. . . . . .. .. 401 - 405 
Crinoidea of the Oriskany sandstone, with reference to p. 138, etc., 406 
Brachiopoda of the Oriskany sandstone, . . . . . . . . 406 - 464 
Lamellibranchiata of the Oriskany sandstone, . . . . .. 465 - 467 
Gasteropoda of the Oriskany sandstone, .. .. . . .. 468 - 479 
Pteropoda of the Oriskany sandstone, . . . . . . . . 479 - 480 
Cephalopoda of the Oriskany sandstone, . . . . . . . . 480 
New Species and Genera of Brachiopoda, .. . . . . .. 481 - 490 
Catalogue of Species, and number of each from the Lower Helderberg 
group in Albany county, .. .. .. .. .. . . 492 - 493 
Notes upon the Genus Graptolithus, and Description of species of this 
and allied genera, . . .. .. .. . . .. .. 495 - 522 
Triplesia, Ambonychia, etc. . . .. .. .. .. . . 522 - 524 
Trilobites of the Shales of the Hudson-river group, .. .. 525 - 529 
Index,. 530 - 532 
Errata, . . . . .. .. .. . . .. .. . . 533 
