620 STUART WELLES. 



7. Productella sp. undesc. This species is one of the more common 

 members of the fauna, and is quite distinct from any heretofore 

 described species of the genus from the Kinderhook faunas, 

 from all of which it may be distinguished by its large size. It 

 resembles some of the larger species from the Chemung beds 

 of New York, but it is sufficiently distinct from any of them. 

 Most of the specimens observed are more or less weathered, 

 and in this condition some of the smaller individuals resemble 

 weathered specimens of Chono pectus fischeri, the proportions 

 of the two shells being much the same, but no authentic speci- 

 mens of Chonopectus have been observed from this locality. 

 The species has been named P. sublaevis, and a description 

 with illustrations will be published elsewhere. 



8. Productus curtirostris Win. This species, described from the 

 Chonopectus fauna at Burlington, was, in a former paper, 1 

 referred to the brachial valve of P. semireticulatus. Additional 

 specimens, however, studied since that paper was published, 

 have demonstrated that the species was well founded, it being 

 a remarkably depressed form of Productus of the semireticulatus 

 type. The specimens from Kinderhook seem to be indistin- 

 guishable from those occurring at Burlington. 



9. Productus semireticulatus Mart. ? A species of Productus of 

 the semireticulatus type, identical with the one so identified 

 from the Chonopectus fauna at Burlington, 2 occurs in the fauna 

 at Kinderhook. The only specimen representing the species 

 is an external impression of the brachial valve which is scarcely 

 different from similar specimens of P. burlingtonensis Hall, 

 except that it is flatter. The pedicle valve also, as seen in 

 specimens from Burlington, is not so strongly convex or ven- 

 tricose as P. burlingtonensis from the Burlington Limestone. 



10. Productus sp. undet. This species is represented by fragmen- 

 tary specimens only, but, so far as can be determined, it is iden- 

 tical with the shells in the Chonopectus fauna at Burlington, 

 formerly identified as P. cooperensis Swall. ? 3 This identifica- 



1 Welter, loc. cit., p. 70, Plate 1, Figs. 7, 8. 



2 Weller, loc. cit., p. 70, Plate 1, Figs. 5, 6. 



3 Weller, loc. cit., p. 71, Plate 1, Figs. 3, 4. 



