304 TWENTIETH REPORT ON THE STATE CABINET. 



XV. DESCRIPTIONS OF SOME NEW SPECIES OF CRINOIDEil AND 



OTHER FOSSILS FROM THE LOWER SILURIAN STRATA, PRINCIPALLY 

 OP THE AGE OF THE HUDSON-RIVER GROUP. 



This paper, to the 17th page, was published in November 1866. The 

 illustrations occupying the principal part of two plates of figures have 

 been made, but could not be engraved in time for the publication of this 

 Keport. The paper will therefore be deferred in its final publication to 

 the next Report. In the mean time, there have been added to the species 

 of Crinoidea previously described, the following new forms, which are 

 likewise figured on one of the plates : Homocrinus constrictus, n.s. ; H. 

 laxus, n.s.; Poteriocrinus posticus^ n.s., and Glyptocrinus parvus. 



XVI. DESCRIPTIONS OF BRYOZOA AND CORALS, 



FROM THE LOWER HELDERBERG GROUP OF NEW-YORK. 



This paper contains descriptions of nearly forty species of Fenestella, 

 Polypora, Hemitrypa, Ichtkyorackis, Escharopora, Callopora^ Trematopora, 

 Ch(Btetes, Aulopora, Favosites and other genera, and will be published in 

 the next Report on the State Cabinet. 



XVII. DESCRIPTIONS OF BRYOZOA, ETC., 



FROM THE UPPER HELDERBERG AND HAMILTON GROUPS OF NEW-YORK. 



This paper will be deferred to the next Report on the State Cabinet. 



XVIII. MISCELLANEOUS NOTICES. 



In order to hasten the publication of this Report, these Notices have 

 been deferred to the next Report. 



