ACTINIA. 11 



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

 under Rhodactinia crassicornis, probably more nearly approximating to the variety 

 spitzhergensis. 



MEMOIRS REFERRED TO IN TEXT. 



1. Cahlgeen, 0. — Zoantbarien ; Hamburg. Ma^alhaens. Sammelreise, Hamburg (1899). 



2. Caelgren, 0. — -Die Actiniarien der Olga-Expedition, Wissenscb. Meeresunter. Neue Folge, v. Band. 



Abt. Helgoland (1902), Heft 1. 



3. Clubb, J. A.^Actinise. Eeport on the ' Southern Cross ' Antarctic Expedition. London (1902). 



4. Dana, J. D. Zoophytes. U.S. Explormg Expedition (1838-1842) ; Philadelphia (1846). 



5. DuEEDEN, J. E. — On the genus Alicia (Oladactis), with an anatomical description of A. costm. Pane. 



Ann. Mag. Nat. Hist. (6), Vol. xv. (1895). 



6. GossB, P. H.— On the British Actiniae. Ann. Mag. Nat. Hist. (3), Vol. i. (1858). 



7. KwiETNiEWSKi, Casimae E. — ' Actiniaria von Ost-Spitzbergen,' Zoologische Jahrbiicher (Syst.) xi. 



(1898). 



8. McMuEEiCH, J. Playfaie. — Actiniae of ' Albatross ' Explorations. Proc. United States National 



Museum, Vol. xvi. (1893). 



9. McMueeich, J. Platfaie. — Report on the Hexactinise of the Columbia University Expedition to the 



Puget Sound daring the Summer of 1896 ; Annals New York Acad. Sci., Vol. xiv., No. 1 (1901.) 



10. McMurkich, J. Platfaie. — Zoolog. Jahrb. Supp., vi. (Fauna Chiliensis iii.) ; The Actiniae of the 



Plate Collection (1905). 



11. Tbale, T. p.— On the Anatomy of Actinia coriacea ; Trans. Phil. Soc. Leeds, i. (1837). 



EXPLANATION OF PLATES. 



VOL. IV. 



b.c. brood chambers. 



c. coelenteron. 



d. directive mesenteries, 

 ec. ectoderm. 



em. embryos, 



en. endoderm. 



in. 60. invaginated ectoderm, 



in. en. invaginated endoderm. 



in. mg. invaginated mesogloea. 



in. o. opening to brood chamber. 



1. m. longitudinal muscle. 



1. m. m. longitudinal muscle of mesentery. 



1. m. t. longitudinal muscles of tentacle, 

 mes. mesenteries, 



2 A 



