CLASSIFICATION OF ACTINIARIA 305 



Species : 



P. neglecta. D. and M., 1860, p. 51. (Isauia neglecta, 

 D. and M.) (See Carlgien, 1900, p. 60, and Pax, 1910, p. 214.) 



A vertical section of a species of P a r a d i s c o s o m a is 

 given in Part II, Text-fig. 3. 



RicoEDEA, D. and M.. ISGO. (See Duerden, 1898, p. 635, &c.) 



Discosoniidae which often live aggregated together in patches. 

 The majority of individuals have more than one mouth, there may be 

 up to seven or so, the disc being consequently sinuous in outline. Some- 

 times individuals are found connected by a basal membrane. No 

 sphincter, though the animal is retractile. Tentacles short and may be 

 somewhat capitate or rounded at the tip, in radial rows on at least some 

 endocoels. Stems of tentacles may be glandular, their tips nemato- 

 cystic. 



Species : 



R. florida, D. and M., 1860, p. 42. (See Duerden, 1900, p. 156; 

 Pax, 1910, p. 219 ; McMurrich, 1889, ' Journ. Morph.') 



Orinia, D. and M., 1860. 



Discosoniidae with tentacular, simple structures in the periphery of 

 the disc. Inner part of the disc provided with characteristic large um- 

 like outgrowths. Between the simple tentacles and the urns a tentacle- 

 free area. (See Carlgren, 1900, p. 60.) 

 Species : 



O. torpida, D. and M., 1860. (See Carlgren, 1900, p. 60, and 

 McMurrich, 1905.) 



Rhodactis, M. Edw. and H., 1851. 

 ?Phialactis, Fowler, 1889. 



Discosoniidae with tentacles of two sorts, simple ones round the 

 mouth and the edge of the disc, branched ones in the middle, which 

 may arise from pits in the disc ; the two sorts not gathered up into 

 sharply-separated zones, and no naked area between marginals and 

 discals. Tentacles may be somewhat capitate in certain states. The 

 animals may live massed together in patches. 

 Species : 



R. rhodostoma, Ehr., 1834. 



R. howesii, Saville Kent, 1893, p. 150. (Sec Haddon, 1898, 



p. 478.) 

 ?R. neglecta, Fowler, 1889, p. 148. (See Carlgren, 1900, p. 59- 

 61. &c.) 

 And perhaps others. 



