46 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 1 1 



Material examined. — 

 Sta. 534-36 San Francisquito Bay 3- 2-36 250 m 



Remarks. — As compared to the West Indian holotype, the spicules of 

 these specimens tend to be slightly smaller. 



The nearest relative of this sponge, P. nionilifera, is cosmopolitan, and 

 further collecting may prove that this specimen is widespread. 



Pachastrella multipora, new species 

 Plate 88, Fig. 176 ; Plate 89, Figs. 177, 178 ; Plate 90, Figs. 179, 180 ; Plate 91, Fig. 181 



Diagnosis. — This specimen is 7 cm by 4 cm by 1^ cm. Both ectosomal 

 and endosomal portions are drab in alcohol. The consistency is woody, 

 and there is a distinct hispidation. A detachable surface membrane 200 ju, 

 thick is found. Pores are very abundant and range from 30 ju, to 90 /x in 

 diameter. No oscules are evident. 



The endosome is "bready" with some suggestion of vertical to radial 

 structure. Gross endosomal cavities are larger just beneath the ectosomal 

 membrane. Flagellate chambers 25 fx in diameter are occasionally seen. 



The principal megascleres are calthrops with rays 45 ji by 390 jx and 

 oxeas 32 jx by 800 /x. The microscleres are metasters 12 ^ti long, peculiar 

 spirasters, with short, blunt rays, also 12 /x long. 



Holotype. — AHF no. 25. 



Type locality. — Off White Rock, Isla Partida; 60 m; bottom of sand 

 and gravel. 



Distribution. — Gulf of California. 



Material examined. — 

 Sta. 556-36 Isla Partida 3- 8-36 60 m 



Sta. 559-36 Isla Partida 3- 9-36 90 m 



Remarks. — This sponge, also found in the Gulf of California, differs 

 from Pachastrella dilifera in the much smaller size of the microscleres, 

 the presence of a definite detachable ectosomal membrane, the absence of 

 the large metasters, and the difference in structure of the spirasters. P. 

 monilifera Schmidt has centrotylote micro rhabds 10 /^ to 20 /x long instead 

 of the long raphids. P. cribium Lebwohl from Japan has the large 

 metasters and very thick microrhabds. 



Genus SPHINGTERELLA (Schmidt) 



Sphincterella osculanigera, new species 



Plate 91, Fig. 182; Plate 92, Figs. 183, 184; Plate 93, Fig. 185 



Diagnosis. — The specimen of this sponge is 3 cm by 2 cm by 2 cm and 

 is cartilaginous in consistency. In alcohol the sponge has an olive-green 



