ACTINIAE. 1 1 



agree generally with the typical crassicornis, so I have concluded to place them all 

 under Rhodactinia crassicornis, probably more nearly approximating to the variety 

 spitebergensis. 



MEMOIRS REFERRED TO IN TEXT. 



1. CARLGREN, 0. Zoantharien ; Hamburg. Magalhaens. Sammelreise, Hamburg (1899). 



2. CAELGEEN, O. Die Actiniaricn der Olga-Expedition, Wissensch. Meeresunter. Neue Folge, v. Band. 



Abt. Helgoland (1902), Heft 1. 



3. CLUBB, J. A. Actinia;. Report on the ' Southern Cross ' Antarctic Expedition. London (1902). 



4. DANA, J. D. Zoophytes. U.S. Exploring Expedition (1*38-1842) ; Philadelphia (1*40). 



5. DUERDEN, J. E. On the genus Alicia (Cladactis), with an anatomical description of A. costce. Pane. 



Ann. Mag. Nat. Hist. (0), Vol. xv. (1895). 



6. GOSSE, P. H. On the British Actiniic. Ann. Mag. Nat. Hist. (3), Vol. i. (1858). 



7. KWIETNIEWSKI, CASIMAR R. ' Actiniaria von Ost-Spitzbergen,' Zoologische Jahrbiicher (Syst.) xi. 



(1898). 



8. McMuRRicH, J. PLAYFAIR. Actinias of 'Albatross' Explorations. Proc. United States National 



Museum, Vol. xvi. (181)3). 



9. MCMURRICH, J. PLAYFAIR. Report on the Hexactinije of the Columbia University Expedition to the 



Puget Sound during the Summer of 1890 ; Annals New York Acad. Sci., Vol. xiv., No. 1 (1901.) 



10. McMuRRicH, J. PLAYFAIR. Zoolog. Jahrb. Supp., vi. (Fauna Chilieiisis iii.) ; The Actinias of the 



Plate Collection (1905). 



11. TEALE, T. P. On the Anatomy of Actinia coriacea ; Trans. Phil. Soe. Leeds, i. (18:57). 



EXPLANATION OF PLATES. 



b.c. brood chambers. 



c. coelenteron. 



d. directive mesenteries. 

 ec. ectoderm. 



em. embryos. 

 en. endoderm. 



in. ec. invnginated ectoderm. 

 in. en. invaginated endoderm. 

 in. ing. invaginated mesogloea. 

 in. o. opening to brood chamber. 

 1. m. longitudinal muscle. 

 1. m. in. longitudinal muscle of mesentery. 

 1. m. t. longitudinal muscles of tentacle. 

 mes. nicsmtcries. 



VOL. IV. 



