ACTINM?. 



are present in rel;itu'ii with the mesenteries of the first cycle in small specimens, including 

 directives, and in large specimens, with the mesenteries of two cycles ; hut I was not 

 al. If to .If!. num.- to my satisfaction if present in relation with the third complete cycle. 

 Both ova and spcrruatozm are present, often associated together in relation with the 

 same mesentery (PI. 3, Fig. 19). Occasionally fertile mesenteries arc found showing 

 ova or spermatozoa alone, but in all the specimens examined microscopically the 

 hermaphroditic condition is constant Embryos in various stages of development are 

 present in the body-cavities of many. 



Genus RHODACTINIA, Agassi*. 



Cribrinidie (Tealiidae, Bunodida?, Bunodactidse), with well-developed foot disc ; 

 distinct verruca* present on body-wall ; radial muscles of oral disc and longi- 

 tudinal muscles of the tentacles neso-ectodermal to mesogloeal ; tentacles simple ; 

 strongly circumscribed endodermal sphincter. 



RHODACTINIA rRA.scx>KNis. 



Actinia crat*ieornu Muller, Prod. Zool. Dan. (177C), p. 281. 



Artinia rly<tntiima Brandt, Prod, duacriptionis animaliam ah II. Mertensio ulcrvatomm ( 1885), p. 18. 



Jlrif- -f- -'- Hantii Agiasix, L., Coinjm* Rend as, XXV. (1847), p. 677. 



Mktfrtinia davuni Verrill, A. K., Mem. Soc. Nat. Hint. Boston (1HG4), p. 18. 



I'rlirina rrauieorntt Vi-rrill, A. E., Proc. Eez Instil. VI. (1%9), p. 4G9. 



Leiotralut >i>it;brrgrn*i* Kwietnicwuki, Zool. Jahrb. (Syrt.) (1898), p. 1, p. 121. 



Carlgren in 1902, in his report on "Die Actiniarien der Olga Expedition" 

 (2, p. 39), thought it necessary to revive the old genus of Agassiz, Jt/uxlnctini<i, 

 and has taken for its type the well-known and widely distributed Actinia Mtusuormr, 

 Miiller. The principal distinguishing character given for the genus is that the radial 

 muscles of the disc and the longitudinal muscles of the tentacles may be meao- 

 ectodermal to mesogloeal. and under /.'. crn**i<#rnij Carlgren places a number of 

 synonyms, including Actinia eltgantissimn, Brandt, and Leiott-al i/i *pitibergen&i#, 

 Kwietniewski. I have previously been struck with the variation in the degree in 

 whifh the muscles of the tentacles are imbedded in the mesogloca, in specimens of 

 cnu*i&rrnix examined by me, from a well-known local habitat, Hilbre Island, at the 

 mouth of the Dee. The text- figures (2, p. 41) given by Carlgren are most 

 instructive, and from Hilbre Island specimens I can produce examples in which the 

 longitudinal muscles are quite as much meso-ectodermal as C'arlgren's figure 4, if not 

 as much as his Fig. 3. In my examination of the ' Southern Cross ' Antarctic 

 Actinians (3, p. 294), I was convinced of the many close resemblances to the type 

 species crassieomis, seen in the specimens then under observation ; and notwithstanding 

 that the longitudinal muscles of the tentacles were not imbedded in the mesogloea, 

 I decided to include these species under the genus I'rtirina. I feel therefore some- 



