Nc. 1090. NEW FREHH-WATER SPONflES—ANNANDALE. 631 



rather thin, but the graniihir coat is well developed and contains 

 many spicules, which are arranged horizontally or nearly so as a 

 rule, but sometimes to a slight extent tangentially. 



Ilahitat. — Camp Keithly, Lake Lanao, Mindanao, Philippines. 

 Altitude 2,250 feet, Mary Strong Clemens, collector, January, 1907. 



TyiK'-speclincn.—QAi. No. 7718, U.S.N.M. 



Remarks. — AA^ith the exception of Ephydathi forth from Luzon, 

 this appears to be the first fresh-water sponge recorded from the 

 Philippines, It appears to be quite distinct from the other form 

 discovered with it and here described; but it is just possible that it 

 nui}' be a form of S. sceptrioides. Pending the acquisition of further 

 information regarding the latter species, however, I prefer to con- 

 sider it a new species. 



All the specimens I have seen are dry. 



Subgenus STRATOSPONGILLA Annandale. 

 SPONGILLA CLEMENTIS, new species. 



In general appearance and color this sponge, judging from dry 

 specimens, closely resembles S. philippinensis, but the surface is 

 usually covered with a network of deep, broad furrows which sep- 

 arate small elevated areas of a more or less circular form. The oscula 

 occur on these elevated areas and are large and numerous. Probably 

 in the fresh sponge the furrows are roofed in by the ectodermal mem- 

 brane. 



In vertical section the transverse fibers of the skeleton are seen to 

 be stouter and more regular than those of S. philippinensis, being 

 hardly infei-ior to the radiating fibers in these respects, so that the 

 skeleton forms a much more regular network than is the case in the 

 other sponge. 



There is a stout chitinous membrane, which sends bunches of hol- 

 low root-like processes downwards at intervals. These do not appear 

 to be in any way connected with the primary skeleton fibers. There 

 are numerous scattered skeleton spicules in the basal membrane. 



The skeleton spicules are smooth, as a rule, but occasionally bear a 

 few irregular spines ; they are somewhat bluntly pointed at the ends, 

 as a rule regularly but feebly curved. They measure on an average 

 0.252 mm. in length and 0.021 mm. in greatest transverse diameter. 



There are no flesh spicules. 



The gemmule spicules are slender, cylindrical, nearly straight. In 

 the middle they bear minute irregidar projections, which only take 

 the form of actual spines towards the two ends. Each end terminates 

 in a stout, straight spine, surrounded by a row of smaller spines at 

 right angles to it. None of the spines are retroverted. 



There are very few gemmules indeed. They occur singly in the 

 basal membrane and are apparently closely adherent to the support 



