ACTINJARIA 



organs on the mesenteries of the second cycle, and look upon the occurrence of such organs on the mesente- 

 ries as very improbable. There are small oral stomata. Whether the large marginal stomata, observed by 

 myself in certain mesenteries, are normal formations or not, I cannot with certainty decide. It is possible 

 that they are artificial and due to ruptures as the specimens were strongly contracted. 



Remarks: The specimens examined by myself were dredged by Grieg in their primary habitat 

 and no doubt identical with the species of Danielssen. 



Thenaria s. Basilaria. 



Fam. Actiniidae. 



Diagnosis: Basilaria with pedal disc commonly well-developed. Column smooth or provided with 

 verrucae (sucking warts) but never with ampullaceous offshoots. Pseudoacrorhagi and acrorhagi (bourses 

 marginales) present or absent. Sphincter absent or weak, endodermal-diffuse or diffuse-circumscribed, rarely 

 aggregated. Tentacles cylindrical or conical, without a sphincter at their base. Mesenteries arranged in several 

 cycles, of which generally more than one is perfect. Longitudinal muscles very rarely strongly circumscribed, 

 mostly diffuse. Acontia absent. 



Genus Actinia Brown. 



Diagnosis: Body rather low. Column smooth without verrucae, its upper part capable of involu- 

 tion. Fossa distinct, deep. Acrorhagi, well-developed offshoots from the inner part of the fossa-wall in 

 variable number (rarely absent.). Sphincter broad, diffuse endodermal (or meso-endodermal in A. bermu- 

 densis teste Me. Murrich). Tentacles short conical. Siphonoglyphes well-developed. Mesenteries numerous, 

 mostly perfect. Reproductive organs in the mesenteries of the first and the following orders, except as 

 a rule in the directive and the youngest mesenteries. 



Whether A. bermudensis really is provided with a meso-endodermal sphincter needs confirmation. 

 Possibly the section has hit the sphincter in the vicinity of the mesenteries, where all sphincters show a 

 tendency to be more or less mesogloeal. 



Actinia equina L,. 



Priapus equinus n. sp. Linne, 1758 p. 656. 



Actinia equina L. Linne 1766 68, p. 1088. Muller 1776, p. 230. Andres 1883, p. 393. Jourdan 1880, 

 p. 65, PI. 4, figs. 1927, PI. 5, figs. 2840. Brunchorst 1890, p. 30. Simon 1892, 

 p. 42. Appellof 1900, p. 4, 1905, p. 59. Grieg, 1887, p. 12, 1898, p. 6. Pax, 1907, p. 53 

 (p. p.), 1908, p. 467, 1920, textfig. i, 2. 

 Actinia mesembryanthemum n. sp. Ellis & Solander 1786, p. 4. 



Ell. & Sol. Rapp 1829, p. 52, PI. 2, fig. i. Sars 1851, p. 144, 1853, p. 12, 

 1857, p. 32. Danielssen & Koren 1856, p. 87. Danielssen 1861, p. 45, 

 Mobius 1873, p. 149. Schulze 1875, p. 139. 

 Priapus ruber n. sp. Forskal 1775, p. 101, p. 27, fig. a. 



18 



The Ingolf-Expedilion. V. g. 



