THE SPONGES OF THE WEST-CENTRAL PACIFIC 211 



The surface is extremely irregular, being covered by lumps which are in 

 turn lumpy. The pores are 60 /x to 120 /x in diameter, and there are 2 or 3 

 per mm. The oscules are 2 to 4 mm, from 1 to 3 cm apart. 



The ectosome is marked off as noted above, and there are extensive sub- 

 dermal cavities. The endosome is extremely full of coarse sand but also has 

 fibers or tracts 60 \x to 120 fi in diameter, making a vague reticulation. There 

 are also some very small fibers, which may be regarded as transverse, measur- 

 ing only about 10 /x in diameter and containing only 2 or 3 spicules per cross 

 section. 



The skeleton, in addition to the fibers mentioned above, consists of very 

 numerous tylostyles, about 5 ^ by 245 ll in dimensions. Renewed attention 

 here may be called to the quantity of foreign material present in the endosome 

 of this sponge. At the surface the megascleres are both tangent and erect. 

 There are surface brushes present, consisting of groups of spicules with the 

 points radiating outward. 



The above description applies chiefly to the specimen from Guam. The 

 specimen from Ebon agrees in general, but is was so small that many of the 

 items here described could not be made out. 



This species is set off from others in the genus by the large amount 

 of foreign material, the extremely irregular surface, and the peculiar colora- 

 tion. It is perhaps closest to Terpios proteus Hentschel, 1909, page 389, from 

 Australia, but this has two size ranges of spicules. Also, the species aploos 

 lacks the larger size range that was present in Hentschel's species. There are 

 the above mentioned differences in surface structures, and the foreign material 

 present. 



The species name aploos is derived from a Greek word meaning "not 

 seaworthy." 



GENUS QUASILLINA Norman 

 Quasillina quiza, new 



Text Figure No. 144 



This species is here represented by the following: 

 U.S.N.M. No. 22835, My No. M. 115, here designated as type, collected June 

 28, 1949, by diver at Majuro Atoll near the north side of the lagoon close 

 to an abandoned radio station. The depth was 3 meters, and the substrate 

 dead coral. 



A 



r* Head of one of the smaller styles, X 782. 



C_ Text Figure No. 144. Spicules of Quas- 

 13 illina quiza. A: Style, X 182. B: Head 



of one of the larger styles, X 782. C: 



