144 A. E. Verrill — New Actinians. 



and fertile mesenteries, which are usually thin and have feeble 

 and diffuse longitudinal muscles. 



This family now appears to include Paractis, Sto?nphia r 

 Aatinostola, Actinernus, Actinolobopsis,* Pycnanthus, f Sider- 

 actis, Cymbactis (near Stomphia), Tealidium, Paranthus, 

 f Paractinia, Kadosactis, Phelliopsis,-f nov. (type P. Pana- 

 mensis Y. '69), Alloactis, nov. (type A., excavata Hert.), 

 Paphactis, nov., Synanthus Yer., Ammophtlactis, nov. (type 

 A., rapiformis Les.). 



The last named genus is remarkable for its small base and 

 for having minute adhesive suckers near the margin. It agrees 

 with Paranthas in living buried in sand and in its elongated 

 form. 



Raphactis, gen. nov. Type R. nitida Y. 



Paractidse having a short column, with thin wall and sub- 

 marginal longitudinal plications, with raised folds or solid ridges 

 of mesogloea. Sphincter muscle enlarged distally in a thick- 

 ened portion of the wall, above which the thin wall can be 

 involuted ; below this fold the wall may be smooth, or wrinkled, 

 or slightly warty, but without suckers. 



Base either broadly expanded, with thin edges, or amplexi- 

 caul and embracing permanently stems of gorgoniae, etc., and 

 in this case the opposite edges of the same or of different 

 individuals unite by sutures. 



Tentacles numerous, rather stout, in several rows, retractile. 

 Mesenteries numerous, 12 or more pairs perfect and fertile; 

 some imperfect ones may also be fertile. Stomodseum short. 

 This genus lacks the pores of the disk and wall described in 

 Korenia. Synanthus Yer. is closely allied in form and habit ; 

 it has a smooth wall and only six pairs of perfect, but fertile, 

 mesenteries. 



Raphactis nitida, sp. nov. Figures 18, 22. 



Base large, either broadly expanded, with thin edges, or else 

 clasping stems of sponges, hydroids, etc., and in the latter case 

 the opposite lobes may unite together in a close suture ; it 

 secretes a tough thin cuticle. Column in contraction low and 

 broad, most of its surface smooth and white in alcohol, often 

 somewhat glossy or, in others, with a parchment-like appear- 

 ance. The infolded summit is strongly plicated. Toward the 

 contracted summit there is a much thickened fold, usually cov- 

 ered with a series of unequal longitudinally convergent, low, 

 rounded, solid ridges, which vary in number and size, and are 



*This new name is proposed for Actinoloba Bert., 1882 (non Blainv., 1834.) 

 The type is A. reticulata (Dana, sp.) of Patagonia, etc. 



f This name is proposed for those species of paractids that have been described 

 as PheUia, on account of the adherent cuticle. They have usually 12 or more 

 pairs of perfect, fertile, and very muscular mesenteries. 



