CLASSIFICATION OF ACTINIARIA 257 



rest of the genus, on account of its seeming lack (^f a conchula 

 and imperfection of some of the primary mesenteries. Certain 

 species have been described under the generic names Bici- 

 d i u m and P h i 1 o m e d u s a , but these are very hkely larvae 

 of various species of Peachia and Halcampa, parasitic 

 on medusae. 



iSub-tribe 2. Endocoelaotaria, mihi. 



Nynantheae with a definite base. Form variable, but the column 

 without vesicles. Ectoderm of column nearly always with spirocysts, 

 but probably without ectodermal muscle, at any rate usually. No 

 sphincter. One or two siphonoglj^phes. Body-wall may be thick 

 and heavy, and the opal disc may be lobed — or both may be quite 

 ordinary in appearance. Tentacles few or numerous, simple or with 

 variously developed aboral swellings of mesogloea ; either in two 

 alternating marginal cycles or else arranged in a way unlike the usual 

 anemone plan ; but there is never more than one tentacle to each 

 mesenterial space. Radial muscle of disc and tentacles ectodermal or 

 with a mesogloeal tendency. Mesenteries varying in detail, but with 

 this in common, that after the first six couples are formed all subsequent 

 pairs aiJjJear in the lateral endocoels, and have their longitudinal muscles 

 oriented as in directives. 



Family 1- Halcuriidae. 



Halcuriidae as used by Carlgren, 1918, p. 24, pro parte, 



i.e. for Hal curias. 



Endocoelactidae, Carlgr., 1897. p. 169. 



Endocoelactaria without peculiarity of body-form such as lobing of 

 disc and basal thickening of tentacles, and with a tendency to develop 

 little groups of nematocysts in the body-wall ectoderm. One siphono- 

 glyphe only. Tentacles simple, up to about seventy. Mesenteries rather 

 well marked out into a few (six or ten) large perfect fertile filamented 

 pairs with circumscribed retractors, and a number of further pairs 

 without these appendages. Some of these smaller mesenteries are per- 

 fect, but they are all, beyond the first ten mesenterial pairs, confined 

 to the uppermost part of the body and are virtually microcnemes. 



Genera : H a 1 c u r i a s and C a r 1 g r e n i a , 

 Halcuriab, McM., 1893, p. 142. 

 Endocoelactis, Carlgr., 1897, p. 169. 



Halcuriidae with definite but sometimes small base. The body is 



