48 



ZOOLOGY. 



sponges north of New York is ChaUnula oculata (Bower- 

 bank), which grows in long slender branches on the piles of 

 wharves and bridges. Allied to it is Axinella (Fig. 32, A, 

 polypoides). 



Allied to Tethea, which is sessile, is a deep-sea form grow- 

 ing on a long stalk, i.e., Stylocordyla boreale (Fig. 33). At 

 the depth of 100 fathoms in the Gulf of Maine occurs a 



Fig. Si.Phei-onema Anna'., half natural size, 

 mucE enlarged. After Leidy. 



ith stellate and anchor-like spicules, 



similar species (S. longissintum Sars). Fig. 34 represents 

 a fine silioious sponge (Pheronema Anna Leidy) from the 

 West Indies. The most beautiful of all silicious sponges is 

 the Venus' flower-basket (Euplectellum asperg ilium], which 

 lives anchored in the mud at the depth of about 10 fathoms, 

 near the Philippine Islands. 



