438 



MR. C. F. JENKIN ON 



[May 12, 



The rays of the triradiates vary from 100-130 fj. long X 10-12 fi 

 thick, the commonest size being 125 x 11 /^. 



The facial rays of the quadriradiates vary from 80-150 fx long 

 X 10-12 ;u thick, the commonest size being the same as of the 

 triradiates 125 x 11 /u. 



Text-fig. 84. 



ClatJirina contorta var. spinosa, spicules. 

 ap., apical raj'. 



X 180. 



The apical rays are 50-65 fj. long x 5-7 fx thick ; they are thicker 

 than those in Minchin's or von Lendenfeld's specimens. 



Olathrina blanca. (Text-figs, 85-87.) 



Guancha hlancha Miklucho. 



Ascetta blanca H. 



One specimen of this sponge was dredged in 10 fathoms at 

 Wasin. Its colour in spirits is pure white. Its shape is shown 

 (natural size) in text-fig. 85. The sponge is formed of flat fan- 

 shaped heads on the ends of a branching stalk. The largest head 

 is shown (x5) in text-fig. 86. It consists of a flat mass of 

 anastomosing tubes with several oscules on the outer edge ; 

 sections show that the head is about three tubes thick, and that 

 the tubes are so arranged that the spaces in the meshwork never, 

 extend right through it. The stalk is somewhat flattened and 



