38 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 1 1 



yellow. A typical specimen is 20 cm thick and at least 10 cm square, and is 

 apparently a part of a larger mass. At the surface it is colored a dull green 

 by foreign material. Oscules and pores are not evident. The endosome 

 contains numerous canals 2 mm or 3 mm in diameter which tend to run 

 vertically. The sole spicule type is a tylostyle which varies from 2 /u, by 

 540 /x to at least 20 /x, by 840 /x. The spicules are in confusion except for 

 bunches placed points upward at the surface. 



Holotype.— U.S.N. M. 



Type locality. — Balboa, Canal Zone. 



Distribution. — Both ends of Panama Canal and the Gulf of California. 



Material examined. — 

 Sta. 1041-40 GuaymasBay 1-23-40 Shore 



Remarks. — This sponge agrees exactly with the published description 

 of specimens from Panama even to the greenish algae deposits on the 

 surface. 



Genus PSEUDOSUBERITES Topsent 



Pseudosuberites pseudos, new species 



Plate 70, Fig. 140 ; Plate 71, Figs. 141, 142 ; Plate 72, Fig. 143 



Diagnosis. — The specimens of this sponge are chocolate brown in 

 color. There is a distinct cortex, semidetachable and about 400 /a thick. 

 Pits or cones about 3 mm in diameter and about the same distance apart 

 are found in a regular pattern on the surface. These may be closed oscules. 

 No openings are visible. There is no hispidation. 



Gross internal structure is very coarse and, like the surface, cartila- 

 ginous in consistency. Smooth tylostyles are the only spicules. Those of 

 the endosome are a confused mass with typical measurements 10 ^u, by 

 330 [x, S ixhy 270 jx, and 10 /x by 300 /a. In the special dermal layer, the 

 spicules, while very like those of the endosome, are arranged in a tan- 

 gential layer. They also tend to be somewhat thinner. A typical size is 

 6/xby 330/x. 



Holotype. — AHF no. 21. 



Type locality. — Pond Island, Lower California, Mexico; from the 

 shore of the lagoon. 



Distribution. — Same. 



Material examined. — 

 Sta. 547-36 Angel de la Guardia Island 

 Sta. 553-36 Pond Island 

 Sta. 1076-40 Tepoca Bay 

 Sta. 1088-40 Ensenada de San Francisco 



Remarks. — P. melanos de Laubenfels, 1934, from the West Indies 

 has spicules 10 /x by 200 /x, but this sponge is black and rather digitate. 



