SUBPHYLUM II : CTENOPHORA 



117 



SUBPHYLUM II— CTENOPHORA 



These differ from other coelenterates in having neither polyp 

 nor medusa, in being without nematocysts, and in swimming 

 by cilia instead of by muscular cells. They are all marine, and 



m. 



Fig. 82. — Hormiphoraplumosa. X c. 6. — After Chun, The Invertebrata, 2nd edition, 



1935. Cambridge University Press. 



ab.p., aboval pole ; ab.fu., aboval funnel ; tn., tentacle ; tn.po., tentacular pouch ; ca. and 8, one of the 

 rows of cilia ; gel., gelatinous material ; pa.can., paragastric canal; tn., mouth. 



are known as sea-gooseberries, a name which roughly describes 

 their appearance. The ciha are arranged in eight conspicuous 

 rows, and there may be two long tentacles. HormipJwra plumosa 

 (Fig. 82) is a common British form. 



