§2 ACTINIARIA 



of a sphincter indicate that the genus may be placed to the family Halcampoididae. The openings in the acti- 

 nopharynx also seem peculiar to me and may require a control examination. Hertwig declares that the 

 number of mesenteries is 36; if we narrowly examine his figure 11 B, PI. 11, which represents the aboral body- 

 end seen from the gastral side, we find some ridges corresponding to the basal part of the mesenteries. Judg- 

 ing by the ridges I cannot but find that the animal has 20 pairs of mesenteries, 8 stronger and 3 weaker 

 pairs in 4 compartments. I do not see a single reason for the necessity of establishing a distinct family for 

 this so imperfectly known genus. If we are to keep the family Polyopiidae, there is no doubt that its place 

 is with the group Athenaria. Possibly Polyopis is related to Siphonactinopsis, as both are provided with 20 

 pairs of perfect mesenteries. 



Genus Halcampoides Dan. 



Diagnosis: Halcampoididae with elongated body. Column not distinctly di\asible into regions, 

 with 2 cycles of apertures in the rounded, physa-shaped proximal body-end, smooth, without " Halcampa- 

 papUlae" or spirocysts in the ectoderm, without a cuticle. No sphincter. Tentacles 12, rather long, cylindri- 

 cal, not bulbously swollen in the apex. Siphonoglyphes 2 somewhat indistinct, without a conchula, 2 pairs 

 of directive mesenteries. Only 6 pairs of mesenteries, all perfect and fertile. Cihated streaks of typical ap- 

 pearance. 



Stephenson (1918 a, p. 10) has placed Halcampoides and Halcampella, viz. Hertwig's species 

 Halcampella maxima in a genus Halcampoides. This arrangement does not seem very suitable to me, as Hal- 

 campoides with its smooth column and its indistinct region-division is essentially differentiated from Hal- 

 campella, which shows a distinct division in regions of the column and is furnished with "Halcampa-papillae." 

 If Halcampoides should be connected with another genus, it would be with A cthelmis to which it is indubitably 

 very nearly allied. Stephenson's species, Halcampoides aspera also ought to be named Halcampella aspera, 

 under the supposition that the type H. endromitata has an endodermal sphincter. If the spincter is meso- 

 gloeal in the type-species, Hertwig's Halcampella to which also Halcampoides aspera belongs, should have 

 a new name, for which, in that case, I would propose Epihalcampa (compare p. 80). 



Halcampoides purpurea (Stud.) Carlgr. 



PI. I, figs. 34, 35. PI. 2, ligs. II, 12. 



Halcampoides purpurea n. sp. Studer 1878, p. 545. PI. 5, figs. 2oa,b. 



— — Stud. Andres 1883, p. 315. Haddon 1889, p. 336. Kwietniewski 1896, p. 586, 



PI. 25, figs. I — 4. Appellof 1896, p. 13. 

 Halcampoides abyssorum n. sp. Danielssen 1890, p. 93, PI. 5, fig. i, PI. 15, figs. 4 — 11, PI. 16, figs, i — 3. 



Mc. Murrich 1913, p. 969. 

 Aegir frigidus n. sp. Danielssen 1887, PI. 2, figs, i, 5, 6, 11. 1890, p. 151, PI. 5, fig. 4, PI. 18, figs. 5 — 10, 



PI. 19, figs. 1—4. 

 Fenja mirabilis n. sp. Danielssen 1887, PI. i, PI. 2, figs. 2—4, 1890, p. 144, PI. 17, figs, i— 14, PI. 18, 

 figs. 1—4. 



