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THE AMERICAN NATURALIST [Vol. XLI 



dellids with which group (or the Histriodrilids) the author is indined 

 to place it. The internal structure was not studied. 



The Sijstematw Position of TricJtoplax. Exer since its discovery 

 Trichoplax has been one of the zoological problems, and now Thilo 

 Krumbach of Brcslau offers evidence^ to show that it may be the 

 planula of the hydroid Eleutheria. His proof is not conclusive but is 

 based upon the histological similarities between the ])]aiiula and 

 Trichoplax, and upon the fad that Triclioitlax :i|.p("are.l suddenly in 



He suggests .mIm. lh..t M..nti.vlli. Tnptup/nr n ptan^- l.clnno. to 

 Eleutheria clapamli. 



Caesar Bottger report- r,lii,nh, plmladi jnnm^ Irom the North 

 Frisian Islands, and (luou . .,1m. ii. pn-cncv tn.ni the Kast Frisian 

 Islands. It has previonsly only Ikh'ii known from the Atlantic coast 



'Zool. Anzeiger, 31, p. 268, 1907. 

 »ZooI. Anzeiger, 31. p. 291. 1907. 

 *Zool. Anzeiger, 31, p. 296, 1907. 



