436 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



Measurements. — In contracted state, length 12.5 cm., greatest 

 breadth 1.5 cm. 



Holotype.—V.S.'NM. No. 49454, El Mogote, sand flats, March 22, 

 1940. 



Remarks. — Unfortunately my description of the species is in- 

 complete, owing to the bad preservation of the upper part of the 

 mesenteries. As far as I can see, the species is identical neither 

 with P. aestuarii nor with P. johnsoni, both described by Torrey 

 and Kleeberger (1909) from southern California. 



Order ZOANTHARIA 

 Family EPIZOANTHIDAE 



EPIZOANTHUS CALIFORNICUS, new species 



Figure 82, a-d; Plate 14, Figure 7 

 ? Epizoanthits elongatus Verrill, 1869, pp. 497, 565. 



Coenenchyme thin and expanded. Polyps very unequal in size, 

 usually cylindrical, closely set (pi. 14, fig. 7) . Coenenchyme and 

 scapus incrusted principally with sand to, at most, half their 

 thickness, incrustations of the scapulus weaker. Ridges of the 

 scapulus rather weak. Owing to the comparatively slight incrus- 

 tation, the body wall feels rather weak. Sphincter strong with 

 large meshes drawn out transversely. Siphonoglyph well de- 

 veloped, hyposulcus short. Mesenteries 34-38 in number. Nu- 

 merous pigmented cells in the ectoderm of the column and in the 

 endoderm of the mesenteries. Mesogloea of the column with nu- 

 merous rounded cells ; also pigmented cells here and there. Nema- 

 tocysts of tentacles partly 12-16.9 by 2.8(3) ju, (microbasic 6-mas- 

 tigophors), partly 36.7-39.3 by 15.5-17 /x (holotrichs, probably 

 belonging to the endoderm) ; those of the actinopharynx 15.5-19 

 by 3 /x (microbasic 6-mastigophors) ; those of the filaments 14-17 

 by 4.2-5.5 /x (microbasic ?j-mastigophors) ; those of the endoderm 

 of the mesenteries 38-42.3 by 14-17 /x (holotrichs) . 



Color in alcohol. — Brown. 



Measurements. — Length of the polyps up to 0.9 cm., breadth 

 0.3-0.4 cm. 



Cotypes. — A few colonies, U.S.N.M. No. 49456, La Paz, March 

 21-22, 1940. 



Additional distribution record. — Near La Paz (Verrill, 1869, p. 

 565) ?. 



Remarks. — The yellowish-brown pigmented cells are so numer- 

 ous that they seem completely to fill the ectoderm. Figure 82, c, 

 shows a section of the column ; figure 82, b, a section of the inner 

 part of the mesogloea of the column with large pigmented cells ; 



