ACTINIANS OF GULF OF CALIFORNIA— CARLGREN 



437 



figure 82, a, a section of the sphincter. The mesogloea of the 

 mesenteries contains very numerous cells, also cell-islets. The latter 

 are sometimes prolonged and take the form of short canals, which, 

 however, do not communicate with one another. In figure 82, d, I 

 have drawn the lower part of a macromesentery showing cells and 

 cell-islets. The number of mesenteries in five examined polyps 

 (some of the largest) is 34 (18 -f 16), 36 (18 -f 18), 37 (18 + 19), 

 38 (20 + 18), 38 (20 + 18). The tentacles of a sixth polyp is 36. 

 The muscles of the mesenteries are weak. 



Figure 82. — a-d, Epizoani/ius californicus, new species: a, Sphincter ; b, section of inner 

 part of mesogloea of column with large pigmented cells; c, section of column; d, 

 lower part of macromesentery with cells and cell islets, e, f, Palythoa complanata, 

 new species: Basal part of two macromesenteries with canal system and holotrichs 

 [Fil, filament), g, h, Palythoa praelonga, new species: g, Sphincter; h, sectional 

 column wall. 



The species may be related to Epizoanthus elongatus Verrill 

 from Peru and Pearl Islands. In fact, the short description of 

 the exterior of Verrill's species agrees well with that given here 

 of E. californicus, but, as Verrill notes that the mesenteries of a 

 specimen were 42 and the tentacles 46 in another (therefore 46 

 mesenteries), it is rather difficult to identify his species with 

 californicus, especially since Verrill says that each tentacle has 

 a small tubercle outside of its base. Evidently only the uppermost 

 part of the scapular ridges are sometimes tuberculated in Epi- 

 zoanthus. In our species, the weak ridges do not show any pro- 



