70 PROFESSOR OSKAR CARLGREN ON THE GENUS PORPONIA 



APPENDIX. 



Now that I have had occasion to examine two highly retracted and badly preserved 

 specimens of the type of Actinernus, A. nobilis Verr. (place of discovery 43° 18' N., 

 60° 24' W., Gloucester Fisheries, 1879, U.S. Fish. Com.), as far as I can see from the 

 bad material, the tentacles of the first and second order are arranged as in Porponia. 

 There are also spirocysts in the ectoderm of the body-wall. Therefore I think that 

 Actinernus nobilis (but not Polysiphonia tuberosa, and probably not A. plebeius — 1 

 have not seen this latter species) must be placed in the Endocoelactidse. Whether 

 Porponia and Actinernus are synonyms I cannot say for the present, but it is not 

 impossible. 



February 4, 1914. 



BIBLIOGRAPHY. 



Carlgrbn, 0., " Studien iiber nordische Actinien," K. Svenska Vet.-Akad. Handl., Bd. xxv., No. 10, 1893. 



"Zur Ketmtnis der Minyaden," O/vers. K. Vet.-Akad. Fork., Stockholm, 1894. 



" Zur Mesenterienentwicklung der Aktinien," O/vers. K. Vet.-Akad. Fork., Stockholm, 1897. 



" Ostafrikanische Actinien," Mitt. Nat. Mus. Hamburg, xvii., 1900. 



" Anthozoa," Bronn's Klassen und Ordnunyen, L. 1-6, 1903-1908. 



" Studien iiber Regenerations- und Regulationserscheinungen, 1, 2," K. Svenska Vet.-Akad. Handl., 



Bd. xxxvii., 1904, Bd. xliii. 1909. 

 Duerdkn, J. E., "Relationships of the Rugosa (Tetracoralla) to the living Zoanthese," John H opkins Univers. 



Circul., Jan. 1902. 



"The Antiquity of the Zoanthid Actinians," Sixth Ann. Report Mich. Acad. Sc, 1904. 



Hertwig, R., " Die Actinien der Challengerexpedition," Jena, 1892. 



M'Murrich, J. P., " Report on the Actiniae collected by the United States Fish. Com. Steamer Albatross 



1887-1888," Prod. U. Stat. Nat. Mus., xvi., 1893. 



" Report on the Actiniaria collected by the Bahama Expedition of the State University of Iowa, 1893," 



Ball. Lab. Nat. Hist. Univ. Iowa, 1898. 



" Contributions on the Morphology of the Actinozoa, 6. Halcurias pilatus and Endoccelactis," Biol. Bull., 



ii., No. 4, 1901. 

 Pax, F., "Studien au westindischen" Actinien," Zool. Jahrb., Suppl. 2, H. 2, 1910. 

 Wassilieff, A., " Japanische Actinien," Abh. Bayr. Acad. Wiss. Mat. Nat., Classe, 1908, 1 Supplb. 



EXPLANATION OF PLATE IV. 



bac, thickenings of the basal part of the ectoderm cells? 



cm., circular muscles. 



ct., ciliated tract of the filament. 



dp., directive plane. 



ec, ectoderm. 



en., entoderm. 



lm., longitudinal muscles. 



m. mesoglcea. 



inf., fibrillous folds of the mesoglcea. 



