ACTINIARIA 



183 



order next to the other directive pair. Supposing that the mesenteries are developed according to the same 

 rule as in Urticina, the ventro-lateral mesenteries of the second cycle are absent, and among the mesenteries 

 of the third cycle only the dorsal pairs in the primary dorso-lateral and lateral compartments are developed. 

 All mesenteries seem to be perfect ; possibly one or other pair of the third cycle may be imperfect, but I cannot 

 decide this, because of the bad preserv^ation of the specimen. The longitudinal muscle pennons are strong, 

 the folds are very liigh and palisade-shaped, the main folds often have small secondary folds, issuing from 

 both sides. The parietobasilar muscles are strong and recall those of the former species. Oral and marginal 

 stomata are present, though not large. The single specimen was a female with numerous, very large ova. 

 The mesenteries of the first and second order incl. the directives were fertile, on the microscopically examined 

 mesenteries of the third cycle I have not observ^ed any reproductive organs. All mesenteries are furnished 

 with filaments, most weakly developed on the mesenteries of the third cycle. 



Systematic remarks. This species is most nearly related to E. marsupialis and arctica, because of 

 the arrangement of the mesenteries. I think that it is a distinct species, as also the nematocysts of the actino- 

 pharynx differ from those of the former species. 



Fam. Paractiidae. 

 Diagnosis: BasUaria with a commonly smooth, rarely tuberculated column, which is devoid of sucking 

 warts (present in "Tealidium" cinctum ?) and acrorhagi. Sphincter weak or strong, always mesogloeal. Tentacles 

 commonly short, on the outside of the base often bulbous, sometimes (in Anthosactis and Tealidium) with a 

 stinging battery in the same place. Mesenteries now typically arranged, but sometimes after another cardinal 

 number than 6, with both mesenteries in the same pair of the younger cycles either equivalent or differently 

 developed, now arisen bilaterally onh' in 12 exocoels, when the 24-mesenteries stadium has been reached. 

 Always without acontia. 



The following genera have been placed in this family by various authors: 



Actinernus Verr. 

 Actinostola Verr. 

 Alloactis Verr. 

 Ammophilactis Verr. 

 Antholoba R. Hertw. 

 Anthosactis Dan. 

 Antiparactis Verr. 

 Archactis Verr. 

 Raphactis Verr. 

 Sicyonis R. Hertw. 



Aulorchis R. Hertw. 

 Cymbactis Mc. Murr. 

 Hormosoma Steph. 

 Kadosactis Dan. 

 Kyathactis Dan. 

 Lilliella Steph. 

 Marsupifer Carlgr. 

 Ophiodiscus R. Hertw. 

 Stompkia Gosse. 

 Synanthus Verr. 



The new genera I have proposed are: 



Epiparactis Carlg. 



Parasicyon is Carlgr. 



Paractinia Andr. 

 Paractis M. Edw. 

 Paranthus Andr. 

 Parantheoides Carlgr. 

 Phclliomorpha Carlgr. 

 Phelliopsis Verr. 

 Pycnanthus Mc. Murr. 

 Polysiphonia R. Hertw. 

 Tealidium R. Hertw. 



Synsicyonis Carlgr. 



Some of the old genera are imperfectly known, some others do not belong to the family, and still 

 others are to be regarded as synonyms. It is, therefore, necessary to discuss the genera more closely. 



