NORTHERN AND SOUTHERN KINDERHOOK FA UNAS 62 1 



tion, however, is incorrect, the original P. cooperensis being a 

 much smaller shell from the Chouteau Limestone of central 

 Missouri, and entirely distinct from this one. 



11. Paraphorhynchus transversum Weller. This shell is identical 

 with a species in the Chonopectus fauna at Burlington, which 

 has been identified as Pugnax striatocostata M. & W. var. P 1 

 but the species is sufficiently distinct from the typical form of 

 striatocostata, it being proportionately much broader than that 

 species and attaining a larger size at maturity. 2 



12. Spirifer subrotundatus Hall. The specimens of this species 

 from the beds at Kinderhook are indistinguishable from those 

 in the Chonopectus fauna at Burlington. 



13. Spirifer marionensis Shum. This is one of the more common 

 species of the fauna, and is of especial interest because it is 

 identical with the shell so common in the fauna of the Louisiana 

 Limestone of Missouri, which may be assumed to be the typical 

 form of the species. The shells from the Chouteau Limestone 

 and other Kinderhook formations of Missouri, excepting the 

 Louisiana Limestone, as well as those from the Kinderhook 

 beds Nos. 5-7 at Burlington, which have usually been identified 

 as 5. marionensis, are distinct from the typical Louisiana Lime- 

 stone representatives of the species. This typical form may be 

 recognized by its less prominent umbo, and by the more nearly 

 obsolete fold and sinus, and although the Louisiana Limestone 

 and Chouteau Limestone species are much alike, they are 

 doubtless specifically distinct. 



14. Syringothyrus extenuatus Hall. Most of the specimens of this 

 species from Kinderhook are separate brachial valves which are 

 more or less imperfect. A single specimen, however, preserves 

 both valves in such a manner that the angle between the plane 

 of the brachial valve and the cardinal area of the pedicle valve 

 can be approximately measured. This angle is 38 , a little 

 larger than the average angle of the specimens in the Chono- 

 pectus fauna at Burlington, which vary but little from 30 . It 

 is, however, much closer to these Burlington specimens than to 



1 Weller, loc. cit., p. 72, Plate 2, Figs. 16, 17. 



2 Weller, Transactions 0} the St. Louis Academy of Sciences, Vol. XV, p. 264. 



