20 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 1 1 



most conspicuous elements. Echinating spicules acanthocladotylotes, size 



3 /x by 80 /x, chords 11 /a and larger. First microscleres, palmate isochelas; 

 length, 14 ju, to 16 /x; second microscleres, toxas; length, 40 fi to 340 /x." 

 (de Laubenfels, 1932, p. 104.) 



Holotype.— U.S.N. M. 



Type locality. — Pacific Grove, California. 



Distribution. — Central and southern California, coast of Baja, Cali- 

 fornia, and the Gulf of California. 



material examined. — 

 Sta. 1085-40 San Pedro Nolasco Island 2- 6-40 55 m 



Remarks. — The Gulf specimen has a rather greater range in spicule 

 length than the California specimens, the styles sometimes attaining a 

 length of 800 fi, while the toxas show an even more amazing variation 

 than those of the California specimens, reaching a maximum of 440 jx. 

 There are many, however, which are in the size range of the holotype. 



Genus LISSODENDORYX Topsent 



Lissodendoryx isodictyalis Topsent 



Plate 28, Fig. 56 ; Plate 29, Figs. 57, 58 ; Plate 30, Figs. 59, 60 



Halichondria isodictyalis Carter, 1882, p. 285. 

 Tedania leptoderma Topsent, 1889, p. 49. 

 Lissodendoryx isodictyalis Topsent, 1894, p. 9. 



Diagnosis. — This is a massive sponge, drab in alcohol, and soft in con- 

 sistency. The surface is superficially smooth and oscules are prominent. 

 A dermis is present about 10 /x thick. It overlies extensive subdermal 

 cavities and contains special dermal spicules, which are tylotes averaging 



4 /A by 175 ;u,. The interior mesh is made up of smooth styles 5 yu, by 145 fi 

 on the average. Arcuate isochelas 21 ju, long and sigmas 18 /x long are the 

 microscleres. 



Holotype. — British Museum. 



Type locality. — West Indies. 



Distribution. — Cosmopolitan. 



Material examined. — 

 Sta. 500-36 Espiritu Santo Island 2-20-36 Shore 



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



Remarks. — ^This sponge has been reported from the West Indies, the 

 Mediterranean, and the East Indies, as well as from the Gulf of Cali- 

 fornia. The characteristics of specimens found in the Gulf follow very 

 closely previously published descriptions. 



