NO. 1 DICKINSON : SPONGES OF GULF OF CALIFORNIA 23 



Genus ISOGIONA Kallmann 

 Isociona lithophenix de Laubenfels 

 Plate 35, Figs. 69, 70 ; Plate 36, Figs. 71, 72 



Plocamia lithophenix de Laubenfels, 1927, p. 263. 

 Isociona lithophenix de Laubenfels, 1932, p. 99. 



Diagnosis. — This sponge has a vague sort of ectosomal specialization. 

 The endosome is an isodictyal reticulation. The principal spicules are 

 acanthostyles to acanthostrongyles 14 ;a by 140 /x. The dermal spicules 

 are smooth tylostyles 5 /a by 200 /a. A few smooth styles 10 /^ by 210 ju, and 

 some acanthostyles 15 /a by 150 /x are also found. The palmate isochelas 

 are typically \1 ix to 2\ p.. The toxas in the Gulf specimens sometimes 

 reach the length of 260 ^ but average around 180 /x. 



Holotype. — U.S.N.M. 



Type locality. — Pacific Grove, California. 



Distribution. — Central and southern California and the Gulf of 

 California. 



Material examined. — 

 Sta. 542-36 Puerto Refugio 3- 4-36 50 m 



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



Sta. 562-36 San Esteban Island 3-10-36 90 m 



Remarks. — ^The toxas found in specimens from the Gulf are some- 

 what larger than those found in specimens from southern and central 

 California, but this is not an especially significant difference. This Iso- 

 ciona is the only member of the genus other than the genotype. 



Family OphlitOSpongiidae de Laubenfels 



Genus MYGALE Gray 



Mycale angulosa (Duchassaing and Michelotti) 



Plate 37, Figs. 73, 74; Plate 38, Figs. 75, 76 



Pandaros angulosa Duchassaing and Michelotti, 1864, p. 89. 

 Hircinia purpurea Whitfield, 1901, p. 49. 

 Mycale angulosa de Laubenfels, 1936, p. 116. 



Diagonsis. — This is a massive sponge with large cavities and a gener- 

 ally coarse gross architecture. It has a densely packed fiber mass ascending 

 to a fan-shaped surface structure. The spicules are tylostyles sometimes 

 only sub; size 2 /x by 200 ju,. The palmate anisochelas are 14 /x to 20 /i and 

 the sigmas 42 /u, to 45 /a. 



Holotype. — Msueum of the University of Turin. 



Type locality. — ^West Indies. 



