ART. 4 SPONGES OF CALIFORNIA DE LAUBENFELS 97 



found in the endosome. Endosomal structure, mostly sand. For 

 further details, see notes given below concerning spicule locations. 



Interstitial spicules, tylostyles (fig. 57, A) ', size, S/x by 330^ to Sfx 

 by 355/Li, heads microspined. These occur in sparsely scattered fasci- 

 cular bundles or tracts in the endosome, points toward the surface, 

 also scattered without order in the ground substance, and most abun- 

 dantly scattered tangentially in the ectosome. Echinating spicules, 

 acanthostyles (tig. 57, C) ; size, 5fx. by 60'/* to 7/* by 70/x. First micro- 

 scleres, toxas (fig. 57, Z>) ; length, -iO/t to 72/x. Second microscleres, 

 microxeas (fig. 57, E) ; size, 1/5/^ by 52fi to y^ix by 65/a. 



Revmrks. — This species is assigned to Clathriopsamma with much 

 hesitation, that genus being poorly known. It was created by von 

 Lendenfeld in 1888 (p. 227), type species G. reticulata^ according to 

 Kallmann (1920, p. 771). Lendenf eld's description is, of course, 



C3 



FIG0RB 57. — Clathriopsamma pseudonapya de Laubenfels, X 300. B, an uncommon spicule 

 intermediate between the other two megascleres 



worthless. Kallmann's redescription is as good as possible in view of 

 the damaged condition of the specimen. 



C. psevdonapya has too elaborate a dermis to be a Microciona, and 

 because its dermal spicules are tangent instead of perpendicular and 

 as large as, instead of smaller than, the endosomal it can not be 

 Eurypon. Fiosifer is of great interest here, as it has also the sand 

 inclusions. Its megascleres are all very small, however, and it has 

 distinctive shuttle-shaped microxeas instead of the exceedingly thin 

 ones of pseudonapya. 



Genus JIA de Laubenfels 



This genus may be characterized by peculiar microscleres shaped 

 like the letter J, one end blunt and the other of ultimate fineness. 

 The known species has also chelas and toxas. The megascleres are 

 monaxons (partly acanthose) in confusion. Genotype and only 

 species: Jia jia. 



JIA JIA de Laubenfels 



Jia jia de Laubenfels, 1930, p. 28. 



Holotype.—V.^.-^M. No. 21510; B.M. Nos. 29.8.22.30. 

 Type locality. — The one specimen is from Monterey Bay, Calif., 

 depth 700 meters, collected May 9, 1929, by E. F. Eicketts. The 



107704—32 7 



