8 



PROCEEDINGS OP THE NATIONAL MUSEUM 



vol.. 81 



LEUCOSOLENIA ELEANOR UrL .n 



Leucosolenia eleanor Urban, 1905, p. 36. 



Holotype. — In the possession of Prof. F. Urban, Marienbad, 

 Czechoslovakia, 



Type locality. — Monterey Bay, 



Material examined. — Abundant California specimens. I find this 

 species only in the vicinity of Monterey Bay, where it is very common 

 intertidally. It occurs on the underside of granite bowlders or under- 

 neath protrusions of rock, often where the surf breaks on it. 



FiGUED 3. — Leucosolenia eleanor Urban : Triradlates (A, B) aad quadriradiates (O) of 

 average size, and extremes of the oxeas (D, E), X300 



Description (U.S.N.M. No. 21465; B,M. No, 29.8.22.46).— Shape, 

 clathrate masses of branching and anastomosing tubes. Size, up to 

 10 cm in diameter; the tubes are 0.3-1.7 mm in diameter. Consist- 

 ency, fragile, slightly spongy. Color in life and when preserved, 

 white. Oscules, simple, few, approximately 1 mm in diameter. 

 Pores, minute, abundant. Surface, superficially smooth. 



Ectosomal specialization, none. Endosomal structure, typically 

 ascon. It is remarkable that although clathrate there are no blind 

 diverticulations, the number of oscules increasing as the size of the 

 colony increases. That which is now regarded as the genus Leuco- 

 solenia was formerly divided into two genera, the second called 

 Clathrina, the basis of separation being the absence or presence of 



