falciferous

— The stinted growth of the stationary Conchifera forms a striking contrast with the size and number of the Cephalopoda interred with them in the same bed; in fact the dawning existence of these Conchifera appears to have been a struggle for life, whilst the conditions of the closing scene of the Belemnites, Nautili, and falciferous Ammonites, were favourable to their continuance in time, but abruptly brought to a termination by some great physical change which took place about the commencement of the deposition of the oolitic formations.