292 Animal Biology 



transparent with changeable colors and are often phosphorescent at night. They 

 are triploblastic (ectoderm, mesoderm, entoderm), while the Coelenterates are 

 diploblastic (ectoderm, entoderm). Ctenophores possess bilateral symmetry in 

 part and radial symmetry in part (biradial symrrietry). They are hermaphroditic; 

 one row of testes lies beside a row of ov-aries against each longitudinal canal. 

 Ctenophores are also called comb jellies because of their eight rows of comblikc 



Fig. 96. — Twelve different species of corals of the phylum Coelenterata, class 

 Anthozoa. A, Stylaster sanguinea fhydroid coral, from Samoa) ; B, Dichocoenia 

 porcata (from Andros Island); C, Oculina sp. (eyed coral, from the Bahamas), 

 D, Fungia sp. (mushroom coral from the Fiji Islands) ; E, Distichophora nitida 

 (hydroid coral, from Samoa) ; F, Manicina areolata (from the Bahamas) ; G, 

 Pocillopora sp. (from the East Indies) ; H, Siderastroea galaxea (star coral, from 

 the Bahamas) ; I, Millepora sp. (hydroid coral, from the West Indies) ; /. Isophyl- 

 lia dipsacea (rose coral, from the Bahamas) ; K, Madrepora sp. (branching coral 

 from the Indian Ocean) ; L, Tubipora musica (organ-pipe coral, from Singapore). 



Mouth _: 



Testes 



A 



Ovaries 



i^--.Comb 



Fig. 97. — Thimble comb-jelly {Beroe sp.) of the phylum Ctenophora. 



