104 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 81 



Principal spicules, subtylostyles (fig. 62, A) ; size, l7/x by 215/i to 

 22/A by 261ju. Microscleres, toxas (fig. 62, C) ; length, 45/i, to 55/x, 

 There are also rhaphides or very slender tylostyles (fig. 62, B) ', 

 size, about 2[x. by 140/a, which may be regarded as microscleres or as 

 interstitial megascleres. 



Remarks. — The original name for this species was Desmacella 

 pennata Lambe (1894, p. 129), from Vancouver Island, about lati- 

 tude 48" 20' N., longitude 123° 40' W. (holotype, now U.S.N.M. 

 No. 7488). It had styles with microspined heads, total size from 



FiGUBE 62. — Ophlitaspongia pennata (Lambe) calif orniana, new 



variety, x300 



16)Li by l70/i to 19;u, by 379)ii, and toxas both more numerous and much 

 larger (72/x to 255;u.) than in the Californian form, which is there- 

 fore described here as a new variety. 



Family ACARNIDAE Topsent 

 Genus ACARNUS J. E. Gray 



ACARNUS ERITHACUS de Laubenfels 



Acarnus erithacus de Laubenfels 1927, p. 258. 



Holotype.— [J.S.'^M. No. 21430; B.M. No. 29.8.22.32. 

 Type locality. — Near Pacific Grove, Calif., intertidal. 

 Material exaTnined. — Nine specimens, as follows: 



1. Collected about 1850 from " California." Zoological Museum, Berlin. 



2. No date nor data, except southern California. Univ. Southern California 



coll. 



3. January 28, 1924, Santa Catalina Island, 36 meters, bottom temperature 15°. 



Univ. Southern California coll., U.S.N.M. No. 21416. 



4. July, 1925, Pacific Grove; intertidal (holotype). 



5. August 1, 1925, Whites Point (near San Pedro) (southern California) ; 



intertidal. Univ. Southern California coll., U.S.N.M. No. 21420. 



6. July 25. 1926, Pescadero Point (central California) ; intertidal. U.S.N.M. 



No. 21431. 



7. January 24, 1929, Carmel, Calif., intertidal. 



8. March 30, 1929, Monterey Bay, 15 meters; trawled by Professor Skogsberg. 



9. May 9, 1929, Monterey Bay, 700 meters ; trawled by E. F. Ricketts. U.S.N.M. 



No. 21506. 



Description. — Shape, encrusting to massive. Size, up to 5 cm 

 thick, 10 mm in diameter. Consistency, firm, slightly compressible. 



