176 REPORT OF COMMISSIONERS OF INLAND FISHERIES. 



Larval Polydora ciliatum and other larval worms. 



Many nauplii. 



Striatella. 



Melosira. 



Grammatophora. 



Schizonema, 



Non-colonial diatoms. 



Young algae, red and brown. 



The stomach and intestine were dissected from each lobster, 

 teased on a slide, and examined. 



The stomachs and intestine of all lobsters except those of very 

 young first-stage lobsters contained a number of diatoms which do 

 not seem to be taken as food, but merely because it is impossible to 

 avoid these omnipresent organisms. The lobsters examined were 

 taken at random, except that very dark colored lobsters (shedders) 

 were avoided because, as Mr. Emmel has shown, these do not eat 

 at all for some time before the molt. 



One hundred lobsters, twenty-five from each of the first four 

 stages, were examined, and the results are presented in the appended 

 table. In presenting this table we must mention the fact that, while 

 particles of clam and small animals lacking hard parts may readily 

 have failed to be recognized, the characteristic scales, tracheae, 

 wings, and compound eyes of insects are readily and positively recog- 

 nized: moreover, the fifth limbs, spermatophores, and the antennae 

 of copepods are so characteristic that three species were positively 

 identified, i. e., Acartia tonsa, Centropages hamatus, and Harpacti- 

 cus chelifer. 



