156 



COELENTERATA. 



Fam. 4. Epibulidae. Polygastric with a short inflated spirally convoluted 

 stem. Cormidia ordinate in a spiral ring protected by a corona of palpons. 

 Pneumatophore without pericystic radial pouches, but with hypocystic villi. 

 Epibulia Esch. ; Angela Lesson. 



Fam. 5. Physalidae. Polygastric, with a short inflated stem horizontally 

 expanded along the ventral side of the large horizontal pneumatophore. Cor- 

 midia in a multiple series along the ventral side of the trunk, usually dissolved. 

 Pneumatophore large, with a chambered dorsal crest, without radial septa 

 or hypocystic villi. Alophota Brandt; Arethusa H. ; Physalia Lamarck; 



Caravella H. 







Class II. ACALEPHAE.* ACKASPEDA. 



Medusae of considerable size with gastral filaments (pliacellae) ; 

 with endodermal gonads ; with lobed umbrella-edge; without true 

 velum. 



The medusae of this class are distinguished from those of the 



RK 



FIG. 130. Aurelia aurita, from the oral surface. MA the four oral tentacles with the mouth 

 in the centre ; Gk generative organs ; GH aperture of subgenital pit ; Rk sense organ 

 (marginal body) ; RG radial vessel ; T, tentacle at edge of the disc. 



* E. Haeckel, Monographic der Medusen, Jena, 1879. L. Agassiz, Contributions 

 to the Natural History of the United States, Acalephae, vol. 3, 1860, vol. 4, 

 1862. C. Glaus, " Studien tiber Polypen u. Quallen der Adria," Denks. d. k. 

 Akad. Wiss. Wien, 1877... Id., Unters. ub. d. Organisation u. Entw. Acalephcn, 

 Prag, 1883. A. Gotte, Ub. d. Entwickelung v. Aurelia aurita u. Cotylorhiza 

 tuberculata, 1887. C. Glaus, "Ub. dieEntwick. desScyphostoma, etc," I. and II. 

 Arb. a. d. Zool. Inst. Wien, 9 and 10, 1S91 and 1893. 



