PAL'EONTOLOGY OF NEW YORK. 



VOLUME VIII, PART II 



This volume will open with the discussion of the spire-bearing 

 genera of the Palaeozoic Brachiopoda, and will include a notice 

 of all genera not mentioned in part 1 of this work. The study of 

 the spire-bearing Brachiopods involves much painstaking and 

 careful mechanical manipulation for the accurate demonstration of 

 their critical characters. The utmost caution is necessary in the 

 discrimination between the apparent and the actual structure of 

 the delicate internal spiral supports, and the investigation of these 

 groups has, therefore, progressed somewhat less rapidly than that 

 of the others. The work, however, is well forwarded, and at 

 the present time 320 type-written pages of manuscript have been 

 prepared, and 70 pages thereof were delivered to the printer on 

 November 9th, 1892. 



The accompanying list will show the number of genera covered 

 by the entire manuscript, and indicate such divisions as it is pro- 

 posed to recognize in the work, including a certain number of 

 new terms which the necessities of the work have required and 

 which are provisionally employed in the form here used. 



Spirifer, Sowerby, 1815. 



Delthyris, Daiman, 1828. 



Trigonotreta, Koeaig, 1825. 



Choristites, Fischer, 1825. 



Fusella, McCoy, 1844. 



Brachythyns, McCoy, 1844. 



Reticularia, McCoy, 1844. 



Martinia, McCoy, 1844. 



Martinopsis, Waagen, 1883. 



Mentzelea, Quenstedt, 1871. 



Cyrtia, Daiman, 1828. 

 Metaplasia, nov. 

 Verneuilia, nov. 

 Cyrtina, Davidson, 1858. 



Syringothyris, Winchell, 1863. 

 Spiriferina, D'Orbigny, 1847. 

 Ambocoelia, Hall, 1860. 

 Athyris, McCoy, 1844. 



Spirigera, D'Orbigny. 1847. 



Euthyrns, Quenstedt, 1871. 



ActinoconchuB, McCoy, 1844. 



Seminula, McCoy, 1844. 

 . CHothyris, King, 1850. 



Spirigerella, Waagen, 1883. 

 Kayseria, Davidson, 1882. 

 Merista, Suess, 1831. 



Camarium, HaU, 1859. 

 MeristeUa, Hall, 1859. 



