LIST Ol'^ LOl JSVILI.K LI M IISTI ).\ 1-: I'OSSJLS. 



415 



WliitfieldeUa nitida Hall. (Nettieroth.) 

 Whitfieldella nitida var. oblata Hall. (H. & W.) 

 Nucleospira elegans Hall. (Nettleroth.) 

 Nucleospira pisiformis Hall. (Nettleroth.) 



Laniellibranchiata. 

 Orthonota curta Conrad. (H.) 



Gasteropoda. 

 Pleurotomaria casii Meek and Worthen. 



Euomphalus (Cyclonema) rugaelineata Hall and Whitfield. 



(H. & W.) 

 Platyostoma niagarense Hall. 



Murchisonia petila Hall and Whitfield. (H. & W.) 

 Cyclonema eancellata Hall. 

 Troehonema fatua Hall. 



Cephalopoda. 



Lituites marshi Hall. 



Crustacea. 



Illaenus barriensis Murchison. (H.) 



lUaenus cornigerus Hall and Whitfield. (H. & W. i 



One of the most striking contrasts between the two faunas ap- 

 pears in the corals. But one of the Waldron species is recorded 

 from the Louisville fauna, while a second is represented in the 

 latter by a variety. Instead of the half dozen species of the Wal- 

 dron fauna we have in the Louisville limestone according to Davis 

 and Hall, 57 species. Too little is known of the Bryozoa of the 

 Louisville limestone to permit profitable comparison. In the Pelma- 

 tozoa we find but two of the Waldron species recorded from the 

 Louisville limestone by Hall. The other 24 species known in the 

 Waldron fauna have not been recorded from the Louisville fauna. 



In the case of the Brachiopoda both lists represent fairly com- 

 plete and accurate knowledge and are probably about equally 

 exhaustive as regards this group in both faunas. Comparison of 

 the species listed in the two faunas shows that 21 of the Waldron 

 brachiopods fail to appear in the Louisville limestone. Some of 

 the Waldron species, which are not found in the later fauna and 

 which may be considered characteristic Waldron species are Mim- 

 ulus waldronensis, Merisfina rectirostris, Homeospira evax, Camero- 



