NO. 1 DICKINSON: SPONGES OF GULF OF CALIFORNIA 33 



found 35 /JL by 1,000 /x and 50 ;u. by 1,150 /a or more. Microscleres are 

 lacking, but peculiar lenslike silicon masses were found in one specimen. 

 These were 20 /a on the long axis. 



Holotype.—AUF no. 18. 



Type locality. — West of Isla Partida; 140 m; rock bottom. 



Distribution. — Gulf of California. 



Material examined. — 

 Sta. 560-36 Isla Partida 3- 9-36 140 m 



Sta. 562-36 San Esteban Island 3-10-36 100 m 



Remarks. — O. annandalei Ferrer-Hernandez, 1923, the genotype, was 

 found in Spanish waters. This, however, had forklike endings on some 

 spicules, while others were faintly polytylote. A typical spicule size is 

 12 II by 400 jLt. 



A specimen of the new species was also found at James Island, 

 Galapagos. 



Oxeostilon burtoni de Laubenfels 

 Plate59, Fig. 117 



Oxeostilon burtoni de Laubenfels, 1934, p. 15. 



Diagnosis. — This is a massive sponge. The Gulf specimens are about 

 7.5 cm by 5 cm by 5 cm and still retain a coral pink color in alcohol at 

 least on part of the surface. There is a thin surface membrane over large 

 cavities and pore areas. The pores are very irregular in size, averaging 

 perhaps 1 mm in diameter. There is a very slight hispidation in places. 



The spicules are variable in size, but common measurements are 280 /a 

 by 18 /J, for styles and 320 /x by 10 /a for oxeas. 



Holotype.—\].?>.N.M. 



Type locality. — West Indies. 



Distribution. — ^West Indies and Gulf of California. 



Material examined. — 

 Sta. 1097-40 Puerto Escondido 2-11-40 18 m 



Remarks. — The spicules found in the Gulf specimens of this sponge 

 are somewhat smaller than those reported for the holotype. 



Order HADROMERINATopsent 



Family Ghoanitidae de Laubenfels 



Genus GHOANITES Mantell 



Ghoanites mineri de Laubenfels 



Plate 59, Fig. 118 ; Plate 60, Figs. 119, 120 ; Plate 61, Fig. 121 



Choanites mineri de Laubenfels, 1935, p. 10. 



Diagnosis. — This sponge is fairly typical of the genus. "The megas- 

 cleres are of one sort only — tylostyles — approximately 10 ;u, by 345 /a, the 



