24 



CCELENTERATA. 



Order III. CALYPTOBLASTEA. 



SERTULARIDA. CAMPANULARIDA. DIPLOMORPHA. THECAPHORA. 

 SCENOTOCA. 



Polypites connected by a coenosarc, and invested by an unor- 

 ganized cbitinous excretion [polypary or perisarcj. Hydrothec 

 and gonangia present. 



Plant-like organisms often taken for seaweed, and always 

 attached to some foreign body. The reproductive elements are 

 matured in the gonophore or, in some cases, free mednsiform 

 zooids are produced. The capsule or gonotheca is the chitinous 

 receptacle in which the gonophores are formed. 



A tubular or cup-shaped extension of the polypary, in which 

 thread-cells [nematophores] are sometimes imbedded, is charac- 

 teristic of the Plumulariidas. 



In Ophiodes Hincks describes certain snake-like organs (cceno- 

 sarcal appendages) distributed upon the creeping stolon ; " they 

 are vigorous in their movements, capable of enormous elongation, 

 and surmounted by a large capitulum thickly covered with thread- 

 cells." They act as organs of defence and in the capture of food. 

 Obelia geniculata is a phosphorescent species, as are also some 

 others of this order. 



A new order Thecomedusae has been founded by Allman on 

 a remarkable form, Stephanoscyphus mirabilis, found by him at 

 Antibes, imbedded in the substance of a sponge ; but whether the 

 association was one of parasitism, or merely accidental, it was 

 impossible to say. 



Campanulariidos. 

 Clytia. 



Campanularia. 

 Obelia = Laomedea. 

 G-onothyrea. 

 Thaumantias. 



Campanulina. 



Leptoscyphidte. 

 Leptoscyphus. 



LafoeidoB. 



Lafoe'a. 

 Salacia. 



Trickydridce. 

 Trichydra. 



Coppiniidce. 

 Coppinia. 



Halecizdcs. 

 Halecium. 

 Ophiodes. 



Mquoreidce. 

 ^Equorea. 



Sertularia. 

 Diphasia. 

 Hydrallmania. 

 Thuiaria. 



Plumularlida* 

 Plumularia. 

 Antennularia. 

 Aglaophenia. 



