42 Bulletin 6 42 



Microdon fejiuistriatus Hall. 



From the lower part of the Ithaca group. — H. S. Williams. 



Conocardium liratiim Hall. 

 This species is reported from the Ithaca group by Prof. Hall. 



Glyptocardia speciosa Hall. 



This species which is a charadleristic and abundant Portage 

 fossil, has been found in a recurrent Portage fauna above the 

 Ithaca group; found occasionally in the midst of the Ithaca fauna. 



Ptychodesma nanum Hall. 

 Ithaca group. — Hall. 



Panenka sp. 



Two imperfe(5l specimens of this genus have been found in 

 the Ithaca group in the Fall Creek sedlion. 



Macrodon chemwigensisf Hall. 



Specimens corresponding to the species except in surface mark- 

 ing, occur sparingly in the upper part of the Ithaca group. The 

 surface of the shell is marked by indistindt concentric striae 

 which are almost obliterated by reticulating lines which mark 

 the surface of the shell with regular rows of small pustules, giv- 

 ing it a distindlly reticulated appearance. 



Par area sp. 



A few fragmentary specimens of this genus have been found 

 in the Ithaca group. 



Niicula diffidens Hall. 



This is a common species in the Portage and Ithaca groups. 



Niicula corbuliformis Hall. 



A few specimens occur associated with N. diffidens which ap- 

 pear to be identical with A^. corbuliformis of the Hamilton. 



Nucula lamellata Hall. 



This is apparently a rare species in the Ithaca group. Two 

 specimens. 



Nueulites triqueter Con. 



A single good specimen of this species was obtained from sta- 

 tion 7-10 in the Ithaca group. 



Palczoneilo constriH^a (Conrad) Hall. 



This is a very common fossil of the Portage and Ithaca groups, 



