ZOOLOGICAL SOCILIV BULLETIN 



215 



SIXTIONAI, VIKW OK IIIK NAUTILI'S. 

 Photograph by L. 1!. Spencer. 



Spencer, may be used in comparison with Dr. shown in more than a dozen septa. The radio- 



Piffard's radiograph. The latter shows, admirably, graph shows practically all that the actual specimen 



the strengthening effect of the septa, which divide shows, and something in addition. Taken to- 



the air-cells, upon the shell itself. The siphuncle, gether they reveal about all there is inside of the 



bv which air is conveyed to the air chambers, is object. 



FASCIOI.ARIA. 

 From a radiograph by Pr. H. (1. I'iffard. 



