258 T. A. STEPHENSON 



sometimes eluiigute, and in isiiiooOi Itiit lor the presence, soiiietimes, 

 of eetodeniiiil batteries of nematoeysts. Margin tentaculate (jr with 

 a parapet, no distal lobing. Tcntaeles up to al)out seventy. Maero- 

 enenies ten pairs, fertile, filamented, and witli strong cireuniseiibcd to 

 t'irciunscribed-dilTuse retractors. Microenemes confined to ui)|)er part 

 of body, either in regular cycles or irregularly placed, some of tliem 

 usually perfect. 



Species : 



H. i)ilatus, McM, 1803, p. 142. (See also McMurricli. 1S«»8; 



11)01, p. ir>r>; Cailgren, lOlS, ]). 25.) 

 H. carlgreni, McM., 11M»J, p. ir.i). (See also tWlgren, 1897. 



p. 159, &c. ; 1914 ; and 1918, p. 26.) 

 H. endocoelactis, Steph., 1918 a, p. 14. 



Cahlgiiknia, Steph., 191S b, p. 109. 



Halcuriidae with definite base, slight parajjct and fosse, and no distal 

 lobing. Eetodeiin of eolmnn. at least in ujiper part, with neniato- 

 cyst batteries. Tentacles about forty in the speeijnens so far jollected. 

 Macrocnemes six pairs, fertile, tilajuented. strong eircuniscribetl retrac- 

 tt)rs. In the lateral cndocoels are four pairs of jx-rfect microenemes 

 which rim down the whole length of the body (see I'art 11. Text-lig. 1 6, G) ; 

 beyond these tirst ten pairs (six pairs macrocnemes and four pairs micro- 

 enemes) any additional microenemes are confined to the ujiper part of 

 the body. 



Species: C. desiderata, Steph., 1918b. p. 109. 



Family 2. Actineknidae. n. fam. 



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



Endoeoelactaria with definite base. Body eylinthical or, more usually, 

 expanded above, and in tliis case often divided into lobes, which are 

 typically four or eight in number. There may or may not be collections 

 of nematoc^'Sts in the body- wall ectoderm. Tentacles may be numerous, 

 simple, or with mesogloeal swellings on the aboral sides of some or all 

 of them. A thick body- wall is a frequent characteristic. Two siphouo 

 glyphes. There are a good many mesenteries, and the older ones are not 

 marked off from the others as macrocnemes ; many are perfect ; the 

 later ones may develop cyclically or bilaterally, and the partnei-s.of 

 a pair be equal or unequal. The mesenterial musculature is not strong, 

 and at least all stronger mesenteries are fertile. 



