1908.] 



CAPE VERDE ISLANDS SPONGES. 



765 



Specimen R.N^. 9, — Length of rays, 0*1-0'11 mm. 



Thickness of rays, 0"009-0'01 mm. 

 Apical rays of quadriradiates straiglit but variable in form ; 

 sometimes half as thick and nearly as long as the facial 

 rays ; sometimes eqvially thick but not much more than 

 half as long as the facial rays. 

 Specimen R.N. 14. — Length of rays, 0'12-0'15 mm. 



Thickness of rays, 0'013-0'016 mm. 

 Apical rays of quadriradiates eithei- straight or bent at their 

 extremities, and from two-thirds to equal length of the 

 facial rays. 

 Specimen R.N. 16. — Length of rays, 0*15-0'19 mm. 



Thickness of rays, 0-01 4-0-01 6 mm. 

 Apical rays of the quadriradiates very variable ; either 

 sti-aight or bent at their extremities ; either nearly as 

 thick and half as long as the facial rays, or else much 

 thinner but longer than the facial rays. 



It will be noted that the rays in the first specimen are only 

 very slightly larger than in Haeckel's L. canariensis, that in the 

 second and third specimens the size is intermediate between 



Text-fiR-. 157. 



Text-fiff. 158. 



Text-fiff. 159. 



Text-fig. 160. 



Spicules from four specimens of Leueosolenia canariensis, showing variation 

 in the size of the spicules in different specimens. All X 120. 



L. canariensis and L. nanseni, that in the fourth specimen the 

 size is almost the same as in L. nanseni, and finally that in the 

 fifth specimen the spicules are larger than in Breitfuss's Ascons. 

 All the specimens contain some triradiates with knobs repre- 



