12 PROCEEDINGS OF THE NATIONAL MUSEUM vol.81 



by 70 mm in size, with oscula much fewer than the total number of 

 tubes. The color in alcohol is given as brown. The tubes are 

 mostly 3 mm thick but vary from about 2 to 5 mm, with walls 0.4 

 to 0.8 mm thick. The surface is smooth both inside and out. Canal 

 system leuconoid. The skeleton is of triradiates only, the largest 

 having rays up to 0.06 by 0.8 mm, others are as small as 0.01 by 

 0.1 mm. All or nearly all are decidedly alate. 



Remarks. — No one seems to have found another specimen of this 

 sponge since Haeckel described it. 



This genus has been quite generally known as Leucandra; but, as 

 Burton (1929, p. 403) points out, the name Leuconia Grant, 1833, has 

 clear priority and should never have been dropped for Leucandra 

 Haeckel, 1872. 



LEUCONIA HEATHI (Urban) 



Leucandra heathi Ubban, 1905, p. 59. 

 Leucandra apicalis Urban, 1905, p. 67. 



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

 Czechoslovakia. 



Type locality. — Monterey Bay, Calif. 



Material examined. — Numerous California specimens were studied. 

 The species is abundant near Monterey Bay, occurring on and under 

 granite bowlders near low-tide mark. In southern California, one 

 finds what I take to be the same species, but so far only small and 

 misshapen specimens. I found one intertidal at Laguna Beach in 

 October, 1925. Other specimens were dredged by the University of 

 Southern California on July 19, 1924, in 78 meters off Catalina 

 Island, and on September 26, 1925, in 29 meters near Long Beach 

 (U.S.N.M. No. 21422). 



Description (material from type locality, U.S.N.M. No. 21462; 

 B.M. No. 29.8.22.39). — Shape, pyriform, if not crowded, otherwise 

 distorted. Size, up to at least 9 cm high, 11 cm in diameter. Con- 

 sistency, mediocre. Color in life and when preserved, basically white 

 but usually dirty. Oscules, apical and usually but one to a sponge. 

 Diameter, up to 10 mm. Pores, about 20/i, in diameter. Surface, 

 superficially hispid. 



Ectosomal specialization, none, aside from the spicule plush. 

 Endosomal structure, leucon type. Histological details: Flagellate 

 chambers 45ju to 85/^ diameter. 



First type of spicules, coronal oxeas (fig. 5, E) ; size, 4/a by 8,000)u 

 to 12/A by more than 10,000/i.. Second type of spicules, large oxeas 

 (fig. 6, G) ; size, 30/. by 3,400/i to IhOfx by more than 5,000/.. Third 

 type of spicules, sagittal triradiates (fig. 5, A) \ size of rays, about 

 10/x by 140/A. Fourth type of spicules, endosomal triradiates (fig. 5, 

 B, C, and D) ; size, up to lO/x by 225/a. Microscleres, microxeas (fig. 

 5, F) ; size, about 4/. by 140/t. 



