306 W. H. Ball — Fossils of the Olympic Peninsula. 



Both Conrad's type and that of Mr. Reagan are poorly pre- 

 served, but there seems no reasonable doubt of their specific 

 identity. 



Nucula (Acila) conradi Meek. 



Nucula divaricata Conrad, this Journal, vol. 5, p. 432, fig. 1, 



1848; not of Hinds, 1843. 

 Nucula conradi Meek, Checklist Miocene foss. of N. Am., Nov. 



1864. 

 Nucula (Acila) castrensis Reagan, p. 174, pi. 1, fig. 2, 1909 ; not 



of Hinds. 

 This species has finer sculpture than N. castrensis the recent 

 species, and is not so abruptly truncate behind. 



Nucula (Acila) gettysburgensis Reagan. 

 Nucula (Acila) gettysburgensis Reagan, p. 175, pi. 1, fig. 3, 1909. 

 This is a fine large species closely related to the recent Japanese 

 N. mirabilis Adams and Reeve. 



Yoldia reagani n. nom. 



Yoldia impressa (Conrad) Reagan, p. 177, pi. 1, fig. 4, 1909 ; not 

 of Conrad. 

 A comparison with Conrad's type shows that the latter is 

 vertically more attenuated toward both extremities and more 

 compressed laterally, being undoubtedly distinct from the present 

 shell, which is closely related to Yoldia beringiana and Y. mon- 

 teryensis Dall, of the recent fauna. Both of them are of greater 

 height from base to umbones, and more inflated than the fossil. 



Phacoides acutilineatus Conrad. 



Lucina acutilineata Conrad, Rep. Geol. U. S. Expl. Exp., p. 725, 



pi. 18, figs. 2, 2a-b, 1849. 

 Phacoides acutilineata Reagan, p. 179, pi. 1, fig. 5, 1909. 

 Phacoides nuttalliif Conrad, Reagan, p. 179 ; not of Conrad. 



A comparison of the specimens named by Reagan acutilineatus 

 and nuttallii shows that they are internal casts of the former 

 species. A fragment queried on the label as possibly nuttallii 

 appears to be part of the valve of a Protocardia. 



Thyasira bisecta Conrad. 



Thyasira bisecta (Conrad) Reagan, p. 180, pi. 1, fig. 7, 1909. 

 This species is correctly identified. 



