i86 Papers from the Marine Biological Laboratory at Tortugas. 



zoanthinas found at Tortugas will show that some of these contain embryos 

 also. In the oldest of the larv?e which I have examined there is not a trace 

 of gcrm-cells and they can not therefore be capable of sexual reproduction. 

 Although these peculiar larva; have been taken only a few times and 

 then in widely separated parts of the earth ; they are certainly not ex- 

 tremely rare, as their abundance at Tortugas and at Nassau shows, and I 

 do not doubt that with the excellent facilities now afforded at the Tortugas 

 Laboratory, some investigator more fortunate than myself will be able to 

 observe their transformation into the adult form, and thus to determine be- 

 3ond any doubt their systematic position. 



REFERENCES. 

 Semper, C. 



1867. Ueber einige tropische Larvenformen. Zeit. wiss. Zool,, Bd. xvii. 

 Van Beneden, E. 



1890. Les Anthozaires pelagiques recuillis par le professeur Hensen, dans son 



expedition du Plankton. I. Une larve voisine de la larva de Semper. 

 Arch, de Biol., Lt. X. 

 1898. Les Anthozaires de la " Plankton-Expedition," Res. de la Plankton-Exp. 

 d. Humboldt-Stiftung. Vol. II. 

 McMuRRiCH, J. Playf.mr. 



1891. Contributions on the morphology of the actinozoa. III. The Phylogeny 



of the Actinozoa. Jour. Morpli., v. 

 Cary, L. R. 



1904. Notes on a peculiar actinozoan larva. Biol. Bull., vii. 

 Heath, Harold. 



1906. A new species of Semper's larva from the Galapagos Islands. Zool. Anz., 

 Bd. XXX. 



