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+ By referring to the description and diagram of Forbesiocrinus Agassizi, (Sup. Iowa Report,) 

 nages 6fi and 67. it will be seen that one ofthe subradial pieces is there by an oversight described 

 as the first anal. It is also worthy of note, that the diagram there given, shows clearly five 

 basal pieces. If this is correct we may doubt the propriety of placing this species in the genus 



It has not b?en considered necessary to mention in this table the number of basal pieces, be- 

 cause both groups agree in having three of these pieces. 



t Messrs Lyon and Casseday described this species as the type of a new genus Onyctwcrinus, in 

 1859. We do not see, however, that it can be distinguished from Furbesiocrinus, as now under- 

 stood. r . 



[Aug. 



