Report of the State Geologist, 211 



FoUomng the inarticulate Bracliiopoda in the arrangement 

 adopted, we have already four plates lithographed in the family 

 Orthidse, and of the Strophomenida and Productidse there are 

 thirteen plates all of which were done previous to resuming work 

 on the volume in 1888. 



Our collections in the families Stophomenid^, Productid^ and 

 PoRAMBONiTED^ are still very deficient and it will be necessary to 

 farther collections in the group of Streptorhynchus and Pro- 

 DUCTUS especially of those from the Carboniferous formations. 



The family Spiriperid^, as at present recognized, embraces the 

 following genera : 



Spirifera, Sowerby, 18l5. 

 Trigonotreta, Konig, 1825. 

 Brachythyris, McCoy, 1844. 

 Choristites, Fischer, 1825. , 

 Martinia, McCoy, 1844. 

 Keticularia, McCoy, 1844. 

 Martiniopsis, Waagen, 1883. 



Mimulus, Barrande, 1879. 

 Crytia, Dalmau, 1828. 

 Ambocoelia, Hall, 1860. 

 Mentzelea, Quenstedt, 1871. 

 Spiriferina, D'Orbigny, 1847. 

 Cyrtina, Davidson, 1858. 

 Syringothyris, Winchell, 1863. 



In this family we have a very good collection of material availa- 

 ble for our use. This collection contains representations of about 

 half the known American species recorded under the genus 

 Spirlfera. Under this family including the genus Spirifera 

 "proper, Syringothyris, Cjrtia, Spiriferina and some other 

 subordinate genera we have already sixteen plates litho- 

 graphed, including 'four plates which were done during the past 

 year. 



I have proposed a grouping of the Spirifera according to the 

 following arrangement : 



Proposed subdivisioks of the genus Spirifera. 

 Number of species classified in the following list: 

 5 Radiata. Clinton — Lower Helderberg and Carboniferous — 

 Chemung. 



10 Fimbriata (plicate). Niagara — Corniferous. 



7 Fimbriata (nonplicate). Niagara — Upper Coal Measures. 



11 Lamellosa (ventral valve septate). Niagara — Upper Coal 



Measures. 

 9 Lamellosa (ventral valve nonseptate). Lower Helderberg — 

 Hamilton. 

 34 Mesio-plicata. Oriskany — Upper Coal Measures. 



