Welter — Kinderhook Faunal Studies. 151 



Species from the Oolite hand, 



ECHINODERMATA. 



Numerous fragments of crinoid stems, belonging to several 

 different species, are present in this bed, but no determinable 

 portions have been observed. 



MOL.LUSCOIDEA. 



BKACHIOPODA. 



Orthothetes sp. undet. 



An imperfect specimen belonging to a member of this genus 

 has been noticed. It is possibly a representation of one of 

 the species of Orthothetes which occur elsewhere in the Kinder- 

 hook beds at Burlington, but it is too fragmentary for cer- 

 tain specific identification. 



Rhipidomella sp. undet. 



A single imperfect specimen of a small subcircular species 

 of this genus has been observed. Its size is about 10 mm. in 

 both length and width. 



Chonetes sp. — cf . C. illinoisensis Worthen. 



A single specimen of Chonetes which may possibly belong 

 to the species C. illinoisensis, has been observed in the ma- 

 terial from this bed. Additional material is necessary, how- 

 ever, for certain specific identification. 



Chonopectus fischeri (N. & p.). 



This species sometimes occurs in the oolite band of bed 

 No. 3, it being the only species of the band, as far as ob- 

 served, which is also present in other faunas of the section. 



MOLLUSC A. 



PELECYPODA. 

 Aviculopecten iowensis Miller. 



PL XIL f. 9. 



Original Description. *' Shell small, appressed, hinge- 

 line equal to greatest width ; anterior and posterior umbonal 



