NO. 1 DICKINSON : SPONGES OF GULF OF CALIFORNIA 39 



Pseudosuberites hyalina (Ridley and Dendy) 

 Plate 72, Fig. 144; Plate 73, Fig. 145 



Hymeniacidon hyalina Ridley and Dendy, 1887, p. 168. 

 Pseudosuberites hyalina Topsent, 1896, p. 127. 



Diagnosis. — Since this sponge is the type of the genus, its description 

 is covered by the genus diagnosis. Its spicules are up to 26 [x. by 1,200 /x 

 and perhaps larger. 



Holotype. — British Museum. 



Type locality. — ^West coast of Chile. 



Distribution. — Cosmopolitan. 



Material examined. — 

 Sta. 650-37 San Francisco Island 3- 9-37 94 m 



Remarks. — This sponge is common in the Mediterranean. 



Order EpIPOLASIDA Sollas 



Family Sollasellidae Lendenfeld 



Genus EPIPOLASIS de Laubenfels 



Epipolasis oxyspicula, new species 



Plate 73, Fig. 146 ; Plate 74, Figs. 147, 148 



Diagnosis. — In alcohol this sponge is an intense black on the surface 

 and a dark gray color within. The specimen is 11 cm by 9 cm by 3 cm. 

 The shape is massive. The consistency is about that of hard rubber. The 

 surface is hispid in patches about 500 fx. The larger areas are superficially 

 smooth, but the spiculation may have been rubbed off. The ectosomal 

 specialization probably consists only in a concentration of pigment cells 

 at the surface. This black surface shades gradually into the gray of the 

 endoderm so that a definite thickness cannot be assigned. 



No openings are found in the undamaged areas of the sponge surface. 



The spicules are arranged so that a definite radial structure is notice- 

 able, although nothing of the nature of tracts can be established. 



The spicules are oxeas and show great variability in size, but there 

 are two definite size ranges. The first of these is most characteristically 

 40 jj. by 2,000 ^i. The second type tends to be dermal and erect. These are 

 on the average 4 /a by 100 /x. 



Holotype. — ^AHF no. 22. 



Type locality. — Port Escondido, Mexico ; from a shore of rock shingle. 



Distribution. — Same. 



Material examined. — 

 Sta. 591-36 Port Escondido 3-16-36 Shore 



