438 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. loi 



jections. On the other hand, the specimen which Verrill with some 

 doubt identified with elongatus, and which was collected near 

 La Paz, is probably californicus. Besides, it is not certain that 

 elongatus and the two other species of Epizoanthus described by 

 Verrill (1869) belong to this genus, as Verrill synonymized Gem- 

 maria (== Palythoa) with Eqnzoanthus. 



EPIZOANTHUS GABRIELI, new species 



Plate 14, Figure 6 



A small colony of five polyps (pi. 14, fig. 6) incrusted with 

 grains of sand occupying the main part of the mesogloea, very 

 closely set. Close to the endoderm there are very numerous cells 

 in the mesogloea, which occur frequently in the mesogloea of the 

 actinopharynx and in the outer part of the mesenteries as well. 

 Coenenchyme flat, thin. Polyps elongate. Ridges of the scapulus 

 distinct, heavily incrusted but hardly visible in contracted polyps. 

 Sphincter mesogloeal, strong, broad, transversely stratified. Si- 

 phonoglyphs well developed. Mesenteries in a larger specimen 

 examined 30, of which 16 (8 + 8) are macrocnemes. Nematocysts 

 of the tentacles 14-19 by about 2.8 /x (microbasic &-mastigophors) ; 

 those of the actinopharynx 15.5-19.7 by 2.8-3 /* (microbasic b- 

 mastigophors, common) ; those of the filaments 11.3-16.2 by 

 2.8-4.2 fi (microbasic p-mastigophors) , moreover a few 10-11 

 by 3-3.5 /A (probably holotrichs, possibly belonging to the en- 

 doderm) ; those of the endoderm 38-43.7 by 14-15(18.3) ix. 



Color in alcohol. — Dark grayish. 



Measurements. — Largest polyp, length 0.8 cm., breadth about 

 0.35 cm. 



Holotype.— One colony, U.S.N.M. No. 49463, Gabriel Bay, Es- 

 piritu Santo Island, April 2, 1940. 



Family ZOANTHIDAE 



PALYTHOA COMPLANATA, new species 



Figure 82, e, f; Plate 14, Figure 9 



Polyps scarcely projecting above the surface of the very thick 

 coenenchyme, very closely set and of very different size, the 

 smallest polyps occurring in the outermost part of the colony 

 (pi. 14, fig. 9). Coenenchyme heavily incrusted with grains of 

 sand. Ectoderm of the scapulus rather thin, without a cuticle. 

 Ridges of the scapulus 18-21 (11 specimens examined). Meso- 

 gloea of the coenenchyme and column with cells and cell-islets. 

 Sphincter forming a row of meshes. Tentacles small, with 

 spirocysts. Siphonoglyph strong, hyposulcus long. Mesenteries up 

 to more than 40. Branched pigmented cells and holotrichs in the 



