120 PROCEEDINGS OF THE NATIONAL MUSEUM vol.81 



while the architecture of enamela is microscopically that of Pachy- 

 chalina and Ohalina, which were supposed to be usually ramose 

 forms. Although moderately close to every one of the numerous 

 species of Haliclona, I find no one species to single out as closest to 

 enaTyiela. 



HALICLONA LUNISIMILIS de Laubenfcls 



Haliclona lunisimllis de Latjbenfels, 1930, p. 28. 



Holotype.—{].S.'^M. No. 21451; B.M. No. 29.8.22.34. 

 Type locality. — Pacific Grove, Calif., intertidal, July, 1925, col- 

 lected by me. 



Additional material examined. — Two specimens taken at Laguna 

 Beach, October, 1925. The species is moderately common in central 

 California. So far, all the specimens I have found were growing 

 on and around coralline algae near low tide. 



Description. — Shape, massive, subspherical, attached only to coral- 

 line algae. Size, up to 2 by 3 by 5 cm. Consistency, toughly spongy, 

 yet easily damaged. Color in life and when preserved, very pale 

 drab. Oscules, craterlike, with raised rims; diameter about 4 mm; 



distance apart, more than 1 cm. Pores, 

 20/x to 60/i in diameter. Surface, super- 

 ficially smooth. 



Ectosomal specialization, vague or lack- 



FiGUHE 73. — Haliclona lunisim- . , ji 



iHs de Laubenfeis, X 300 mg- Jindosomal structure; there is a 



groundwork that is a very fragile, typi- 

 cally renierid isodictyal reticulation. Throughout this there is a 

 course reticulation of tough spongin fibers about 75/* in diameter, 

 crowded with many rows of spicules in typical pachychaline fashion. 

 This species admirably shows the impossibility of separating genera 

 upon these characteristics, which are, however, of supplementary 

 value in species descriptions. This particular species may be charac- 

 terized as one fitting the diagnoses of the old genus Reniera and the 

 so-called Pachychalina. 



Ascending fibers 70/x to 100/i, in diameter, cored by many rows of 

 spicules. Accessory or transverse fibers 70/x to lOOju in diameter, 

 cored by many rows of spicules. 



Principal spicules, oxeas (fig. 73) ; size, 8/x by 110/x to IO/a by 125/x. 



Remarks. — This seems a well-marked species, though numerous 

 sponges described as Reniera and as Pachychalina resemble it more 

 or less. See notes given above in the description of the endosome. 



HALICLONA CINEREA (Grant) 



Spongia cinerea Grant, 1827, p. 204. 

 Halichondria cinerea Fleming, 1828, p. 521. 

 Isodiotya cinerea Bowbibbank, 1866, p. 274. 

 Reniera cinerea Schmidt, 1870, p. 77. 



