4 
PALEONTOLOGY OP NEW-YORK. 
The following list, in the order in which they are described, embraces 
all the genera of Brachiopoda at this time known to me in the rocks and 
groups previously noticed on the first page, and from which species are 
described in this volume. 
LINGULA, 
DISCtNA, 
CRANIA, 
PHOLLDOPS, 
ORTHIS, 
STREPTORHYNCHUS, 
STROPHOMENA, 
STROPHODONTA, 
CHONETES, 
PRODUCTUS = PRODUCTELLA, 
SPIRIFERA, 
CYRTIA and CYRTENA, 
TREMATOSPIRA, 
RHYNCHOSPIRA, 
RETZIA?, 
NUCLEOSPIRA, 
ATHYRIS, 
MERISTA, 
*** There are one or two other generi 
the list occurring in these formations. 
MERISTELLA, 
ATRYPA, 
CCELOSPIRA, 
RHYNCHONELLA, 
STENOCISMA, 
LEIORHYNCHUS, 
LEPTOCCELIA, 
CAMAROPHORIA, 
PENTAMERUS, 
PENTAMERELLA, 
GYPIDULA, 
AMPHIGENIA, 
RENSSELERIA, 
TEREBRATULA, 
CRYPTONELLA, 
CENTRONELLA, 
TROPIDOLEPTUS, 
YITULINA. 
i, which may be ultimately included in 
