22 PEOCEEDINGS OP THE NATIONAL MUSEUM vol. 76 



Gravel Point stage: 



Merophyllum cysticum (Winchell). 



Prisniatophi/llum dcividsoni michiganense Grabau (chironym). 



P. anna (Whitfield). 



Chonophyllum ponderosum Rominger. 



Aulopora alecti forma (WincheU). 



A. aperta Winchell. 



A. conferta Winchell. , 



A. cyclopora Winchell. 



Ceratopora partita (Winchell). 



C. fenestrata Winchell. 



Alveolites suiramosus Rominger. 



Although most of the beds of the Traverse series offer abundant 

 evidence of the existence of a varied crinoid association, identifiable 

 remains are among the rarest occurrences. A few poorly preserved 

 calices of a species of Megistocrit'ms found low in the Petoskey are 

 the only notable exceptions. 



Through many of the beds are also found abundant and beauti- 

 fully preserved fossils of bryozoa. The Cryptostomes are especially 

 numerous, and these are at the present time undergoing revision and 

 discriminating study by C. F. Deiss, formerly of the University of 

 Michigan. Most of the other forms in the Little Traverse Bay area 

 have received little attention. Of the described forms with known 

 limited range only Cystodictya sulcata Winchell from the lower part 

 of the Gravel Point may be cited. 



Brachiopods are a very common element of the f aunal associations. 

 Among them are a number which may be mentioned as characteriz- 

 ing the individual units. 



Petoskey formation: 



Stropheodonta erratica fissicosta Winchell. 



S. demissa forticosta Winchell. 



Chonetes cf. coronatus (Conrad). 



Spirifer filicosta Winchell. 

 Gravel Point stage: 



Stropheodonta erratica solidicosta Winchell. 



8. near concava Hall. 



Doumllina cf. inaequistriata, (Conrad). 



Chonetes emmetensis Winchell. 



Spirifer mucronatus longispina Grabau, (chironym). 



8. Wdorsalis Winchell. 



Athyris e'borea (Winchell), var. 



Nowhere in the section are the mollusca particularly well repre- 

 sented. Of the pelecypods the only notable representative in the 

 Petoskey beds is a single species of Conocardivmi, C. bif avium, Win- 

 chell. The Charlevoix series is characterized by a profusion of two 

 doubtful species of Edmondia^ E. mactrodies Winchell and E. ledo- 

 ides Winchell. Scattered individuals of a few undescribed species 

 are found in several zones of the Gravel Point. The following forms 



