26 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 1 1 



portion of the shaft is thicker than the noblike ends. The same is true to 

 a lesser extent with the styles, which are coring. These spicules are rather 

 thick toward the center but taper to the rounded end. The third megas- 

 clere is a thin, exceedingly long spicule, probably an oxea. These are 30 fi 

 thick. Just how long they are is not possible to say, as they are much 

 broken ; but they extend at least 4 or 5 mm. 



The trichodragma modification is present in the microscleres. Tylo- 

 styles 100 /I to 150 ^ long and 1 /* to 2 /x thick are the microscleres. 



Holotype. — AHF no. 13. 



Type locality. — West of Isla Partida, Lower California, Mexico; 

 140 m; rock bottom. 



Distribution. — Same. 



Material examined. — 

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



Remarks. — No other member of this genus appears to have been re- 

 ported from the Pacific coast. The type of the genus is Australian. It 

 appears to be the nearest relative, but the spicule sizes do not at all 

 correspond. 



Family Amphilectidae de Laubenfels 



Genus BIEMNA Gray 



Biemna rhadia de Laubenfels 



Plate 44, Fig. 88 ; Plate 45, Fig. 89 



Biemna rhadia de Laubenfels, 1930, p. 26. 



Diagnosis. — The specimen of this sponge is 6 cm by 4 cm by 2 cm, 

 color in life drab, consistency mediocre. Occasional oscules 2 mm in 

 diameter are present. The endosomal structure is mostly confused but 

 shows occasional tracts. 



The principal spicules are styles 25 /x by 500 ju, to 28 ^ by 1500 yu,. 

 The most usual size is 28 jx by 750 /x. There is a tremendous range of 

 sigmas, 20 /x to 400 jx in length. Rhaphids 1 p. by 150 /x are also present. 



Holotype.— U.^.'H.M. 



Type locality. — Monterey Bay, California. 



Distribution. — Central California to the Gulf of California. 



Material examined. — 

 Sta. 557-36 Isla Partida 3- 8-36 90 m 



Remarks. — The California specimens of this sponge do not differ 

 materially, but they do not shows quite the size range of spicules that is 

 found in the Gulf specimens. 



