262 T. A. STEPHENSON 



Family 1. Condylanthidae, n. fam. 



Antheadae as used by Carlgren, 1899, p. 9, pro parte. 

 Actiniidae as used by Pax, 1907, pro parte, &c. 



Endomyaria with definite base. Body-wall unspecialized. without 

 verrucae, the body fionietimes elongate* and half vermiform. Tentacles 

 retractile, in several cycles, .simple, not inore than one to each exo- 

 and endocoel. No sphincter. Radial musculature of disc and tentacleib 

 ectodermal. Mesenteries di\aded into macro- and microcnemes, niacro- 

 cnemes (bearing gonad, filament, and strong retractor) six pairs ; micro- 

 cnemes without those structures. 



Genus : Condylanthus. 



CoNDYLANTHus, Carlgi'., 1899, p. 15. 



Charisea, Torrey, 1902. 



With tlie characters of the family. 



Species : 



C. magellanicus, Carlgr., 1809, p. 1.5. 

 ('. saxicola, Torrej', 1 902. 



There seems to be no adequate way of separating off these two 

 species into two genera, the differences being seemingly of 

 specific value only. I have therefore listed Charisea as 

 a synonym of Condylanthus. wliich has priority. 



Family 2. Myonanthidae, n. fam. 



Antheadae as used by McMurrich, 1893. p. 146, pro parte. 



Actiniidae as used by Pax. 1907. pro parte, and Haddon, 

 1898, p. 414, pro parte. 



Gonactiniidae as used by Carlgren, 1900, p. 15, pro parte 

 (Boloceroides). 



Endomyaria with definite base, which may be slight, with or without 

 basilar muscles. Body-wall smooth or with suckers. Ectodermal 

 muscle and spirocysts in body-wall and actinopharynx present or absent. 

 No vesicles. Tentacles simple, not more than one j)er exo- and endo- 

 coel ; they may be deciduous or not ; their longitiidinal muscle is 

 ectodermal. Sphincter absent or endodermal. not very strong endo- 

 dcrmal. diflfuse or circimiscribed-diffnse. Siphonoglj'phes present or 

 aijsent. Mesenteries not divided into macro- and mierocnemes. Perfect 

 mesenteries six pairs. Fertility affects the older mesenteries, excepting 

 sometimes the directives. Reti'actors strong or weak. 



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