CLASSIFICATION OF ACTINIARIA 291 



Family 10. Homostichanthidae, Carlgr. 



Homostichanthiclae, Carlgr,, 1900, p. 118. 

 Discosomidae as used by Duerden, 1900, p. 154, pro 

 parte. 



Endomyaria with definite base. The known form has smooth body 

 but for possible acrorhagi. Sphincter not strong, circumscribed diffuse. 

 Retractors diffuse. Tentacles all of one sort, simple, may be short 

 and more or less papilliform, in radiating series on the exocoels as well 

 as the endocoels. Numerous perfect mesenteries. 



Genus : H o in o s t i c li a n t bus. 



HoMOSTicHANTHUS, Duerdeu. 1900, p. 160. 



Homostichanthidae in which the body may be elongate, smooth ; distal 

 part may be somewhat folded. Margin with elevations, possibly acro- 

 rhagi, and slight fosse. Retractile. Tentacles short, smooth, slightly 

 capitate, knob-like, their stems glandular and heads nematocystic, their 

 longitudinal musculature ectodermal. Slight circumscribed-diflfuse 

 sphincter. Numerous perfect mesenteries and diffuse retractors.- 



Species : 



H. duerdeni, Carlgr., 1900. p. 117. (See Duerden, 1900, p. 167.) 



Family 11. Aurelianidae. 



Aurelianidae, Andres, as defined by Carlgren, 1900 (small 



paper on Stichodactylines), p. 279. 



Endomyaria with definite base, which may be large or small. Body 

 may have more or less cuticle, or may have small vesicle-like veirucae 

 below the margin. The tentacles are small vesicular outgrowths, often 

 lobed, two or three or many communicating with each of the main 

 exo- and endocoels. Sphincter strong circumscribed (see Part II, Text- 

 fig. 13). Main mesenteries very strongly muscular, the retractors 

 exhibiting at their best the extreme of circumscription and distinction 

 from the mesenterial surface. All stronger or all mesenteries perfect 

 and fertile. Only one siphonoglyphe. Radial musculature of disc and 

 tentacles, such as it may be, ectodermal or mesogloeal. 



Genera: Aureliania, Actinoporus. 

 Aureliania, Gosse, 1860, p. 282. 

 Probably Leiotealia, Hertw., 1882, p. 37. 



Aurelianidae with a very wide base, so that the body slopes inwards 

 more or less to the narrower disc. No verrucae. Body divided more or 



