1908.] 



AFRICAN CALCAREOUS SPONGES. 



453. 



X 6-8 [x. thick. Dermal paired ray considerably bent near the 

 root, 80-1 30 /A long x 6-8 /* thick. Oral angle 95° to 110°. 



{cl) Subgastral triradiates. Basal ray straight, 100-260 ^ long 

 X 7-9 /A thick. Paired rays equal, bent downwards near the root, 

 80-1 40 [L long X 7-8 /* thick. Oral angle 165°. 



The quadriradiates are of one sort : — 



(e) Quadriradiates from the gastral layer. Basal rays straight,, 

 130-150 iL long X 9 /A thick. Paired rays straight, 90-130 [x long 

 X 8-10 /A thick. Apical rays 80-130 ^ long x 4 />(, thick. 



Heteropegma nodus gordii Pol. (Text-fig. 103.) 



Three specimens of this sponge were dredged in 6-10 fathoms 

 at Wasin. In form and size they agree closely with Polejaeff's. 

 description and figures (2). TJie spicules (text-fig. 103) also agree 

 with his description with the following slight difierences. The 

 minute tri- and qiiadriradiates in the Wasin specimens are about 

 4 fx thick, whereas Polejaefi" gives 2 [x. There are none of the 

 intermediate forms mentioned by Polejaeff between the remark- 

 able alate tri- and quadriradiates which line the gastral cavity 

 and the regular tri- and quadriradiates which are scattered 

 through the body. 



Text-fig. 103. 



Seteropegma nodus gordii, spicules. X 40. 



Leucilla floridiana. 

 Leucaltis floridiana H. 



One specimen of this sponge was dredged in 10 fathoms at 

 Wasin. It is irregular in shape, 10x7x5 mm., and has an, 



