348 



EIGHTEENTH REPORT ON THE STATE CABINET. 



The length of the outer chamber along the middle is an inch and three- 

 fourths, and the dorso-ventral diameter in the middle of the length is two 

 a,nd a quarter inches. The septate portion has been abruptly arcuate, the 

 length of the remaining part being four times as great on the outer as on 

 the inner side of the curve. The greater and lesser diameters of the septa 

 are about as seven to ten. The siphuncle is submarginal. 



The cast of the outer chamber is marked by what appears to be regular 



vascular impressions extending outwards from the first septum. 



7 



Fig. 7. Phragmoceras nestor. ( Lateral view.) 



41 



Fia. 8. Phragmoceras nestor. ( View of aperture.) 



