THE NAUTILUS. 119 



beak having not a trace of radial sculpture, but only a fine, concen- 

 tric sulcation. Hence the shell not only is not D. sfiuttleworthit, but 

 strictly speaking is not even a Diplodon. The beaks of D. shuttle- 

 worthii have " strongly, irregularly radiate, curved bars." 



Mr. Bednall was unable to procure for me a single example of D. 

 vittatus Lea, or D. evansii A. & A., or of D, wilsonii, having un- 

 eroded beaks. But from the general similarity of the shells, it is, I 

 believe, more than probable that a subgenus composed of these and 

 possibly other Australian shells, having concentric beak sculpture or 

 none, should be made and the definition of Diplodon be correspond- 

 ingly broadened. 



NOTES. 



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A NEW PTEROPOD FROM NEW ENGLAND. By C. H. Danforth, 

 (Proc. Boston Soc. Nat. Hist., vol. xxxiv, pp. 1-19, pi. 1-4). 



This new pteropod, Pxdoclione doliiformis, which also proves to 

 be a new genus, was taken in the plankton of Casco Bay, Me., on the 

 nights of Aug. 28 and Sept. 5, 6, 7 and 8, 1902. On a hasty ex- 

 amination it was referred to a larva of some gymnosomatous 

 pteropod. Later, in making some sections, they were found to be 

 sexually matured adults. " This genus does not properly fall under 

 any established family although perhaps it approaches most nearly 

 the Clionidse, from which it differs in having an odd number of 

 cephalocones and in having the entire posterior part of the body 

 filled by the viscera." The species is described as : " Transparent ; 



