262 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. 



CARLGREN, O., " Studien liber nordische Actinien," K. tivenska Vet. -Alt ad. HandL, Bd. xxv., No. 10, 1893. 



"Zur Keimtnis der Minyaden," 6/vers. K. Vet.-Ahad. Forli., Stockholm, 1894. 



"Zur Mesenterienentwicklung der Aktinien," Ofvers. 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 Vtt.-Akad. HandL, 



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

 DUBRDBN, J. E., "Relationships of the Rugosa (Tetracoralla) to the living Zoan these, " John Hopkins 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 Actinias collected by the United States Fish. Com. Steamer Albatross 



1887-1888," Proc. 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 Endocculactis," Biol. Bull., 



ii., No. 4, 1901. 



PAX, F., "Studien an westindischen Actinien," Zool. Jalirb., Suppl. 2, H. 2, 1910. 

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



EXPLANATION OF PLATE. 



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 mesoglrea. 



(HOY. soc. EDIN. TRANS., VOL. L., 70.) 



