530 



REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



[18] 



Eschscholtz. The largest of the other genera of Narcomcdusre are 

 50 mm in diameter, one-half the size of large specimens of IS. incisa. 



In all specimens of S. incisa found, the under wall of a stomach is 

 supposed to be ruptured and absent. The liability of this to occur in 

 Solmaridai has led me to suppose the same thing possible in my new 

 species. 



ACEASPEDA. 



Family COLLASPID^E, Hseckel. 

 Atolla bairdii, Fewkes. 



Atolla verrillii, Fewkes. 



The two species of American Atolhv, A. bairdii and A. verrillii, can 

 be readily distinguished by the size of the marginal sense bodies, 

 which in the latter are larger, longer, and narrower than in the former. 

 The number of tentacles in bairdii is generally twenty-two, while in 



