A. E. V err ill — New Actinians. 377 



Pseudophellia arctica Ver. Figure 34 (type). 



Phellia arctica Verrill, Proc. Essex Inst., vol. v, p. 328 [14], 1868; Trans. 

 Conn. Acad., i, p 490, 1869 {not of Danielssen*). 



The type of this species is still preserved. The original 

 description is pretty complete as to the external appearance, 

 but a typographical error occurred, in the measurement of the 

 eggs. They are "05 of an inch in diameter (not *5). When I 

 originally described them I did not feel certain that they were 

 not parasitic structures, but subsequent discoveries have 

 removed this doubt. The mouth has two strong siphonoglyphs 

 and about 18 folds on each side. The stomodseum is strongly 

 plicated. There are about 24 nearly equal pairs of perfect 

 mesenteries, with a few small ones of the fourth cycle. The 

 longitudinal muscles are rather thick and strong on the per- 

 fect mesenteries. 



The tentacles are rather large and moderately long ; they are 

 only partly retracted in the type, but the sphincter muscle is 

 well developed, so that they are probably capable of complete 

 retraction and concealment. In section the sphincter muscle 

 has an ovate outline. The wall is rather thick and firm with 

 a .thick mesoglcea, except in the capitulum, which is smooth 

 externally and forms a distinct submarginal fold and small 

 fosse. Circular muscular layer of the wall is well developed. 

 The cuticular layer is thick and soft, and often nearly or quite 

 conceals the eggs when enclosed in the pits, which are largely 

 excavated in the mesoglcea. 



JEpiactis prolifera Ver. Figure 25. 



Trans. Conn. Acad, i, p. 492, 1869. 



Epiactis fertilis Andres, op cit., p. 363, 1884. f 



The figures now given are from one of the original types. 



The largest specimens seen have about 96 tapered tentacles ; 

 they can be entirely retracted and concealed. 



The wall, in section, is moderately thick and firm, with the 

 different layers very distinct ; the ectoderm is rather thick and 

 close ; muscular layer well defined and continuous. The 

 sphincter muscle is large, clearly circumscribed, ovate in sec- 

 tion, essentially endodermal, but not so much detached from the 

 wall as usual in Bunodactidce. There is a distinct collar and 

 fosse, in contraction. The mesenteries are regularly hexamer- 

 ous, in four cycles, with some small ones of the fifth ; 12 or 



*The Phellia arctica Dan. (Actinida, p. 54, 1810) is a true Phellia and may be 

 called P. Danielsseni, to avoid confusion with our species. 



f Andres changed the specific name on account of its prior use for Gonaciinia 

 prolifera Sars, but that belongs not only to a different genus, but to a widely dif 

 ferent family, so that the change of name was not necessary. 



