ACTINIANS OF GULF OF CALIFORNIA— CARLGREN 



423 



forming branched folds, which are stronger on the directives (fig. 

 79, c) than on the other mesenteries. The single specimen is sterile. 



PHIALOBA, new genus 



Pedal disc well developed. Column smooth, with very numerous 

 basitrichs. Margin tentaculate. No sphincter. Tentacles conical, 

 short, up to more than 400, most of them on the border of the 

 lobed oral disc, their longitudinal muscles ectodermal. Two not 

 deep siphonoglyphs, two pairs of directives. Numerous pairs of 

 perfect fertile mesenteries, including the directives. Considerably 

 more mesenteries at the margin than at the limbus. Retractors 

 bandlike, diffuse. Cnidom: spirocysts, basitrichs, and microbasic 

 ?;-mastigophors. 



Figure 79. — a, Bunodactis mexicana, new species, sphincter, b, c, Epiactis irregularis, 

 new species: b, Sphincter; c, retractor of directive, d, Phialoba steinbecki, new 

 species, retractor of directive, e-g, Phyllactis concinnata (Drayton) : e, Sphincter 

 of specimen from Puerto Refugio; /, sphincter of specimen from Point Lobos; g, 

 elongate sphincter. //, Phyllactis bradleyi (Verrill), sphincter. 



PHIALOBA STEINBECKI, new species 



Figure 79, d; Plate 14, Figure 5 



Column with extraordinarily numerous, closely set basitrichs. 

 No sphincter. Tentacles hexamerously arranged, probably not 

 retractile, or imperfectly so, most of them situated close to the 

 margin. About 48 pairs of perfect and fertile mesenteries. Re- 

 tractors of the perfect mesenteries rather bandlike with high, close, 



