128 



ACTINIARIA 



Remarks: After having examined Danielssen's Cactosoma abyssorum I think that this species 

 is identical with liis Phellia crassa. In the above-named pubhcation (1902) I placed Phelliomorpha [Phellia) 

 crassa among the Paractiidae as I suggested that a regular pedal disc and basilar muscles were developed 

 here. After having stated the incorrectness of this suggestion (compare above) the position of the genus 

 must be among the Halcampidae. Its structure, especially that of the capitular region and of the sphincter, 

 also agrees well with that of Halcampa. It might, however, not be correct to place both genera together in 

 a single genus. The genus Halcampa, although furnished with 2 cycles of mesenteries, has never more than 

 12 tentacles, while in the genus Cactosoma the development of the tentacles and that of the mesenteries cor- 

 respond in this way that if two cycles of mesenteries appear, the number of tentacles is also more than 12. 



Fam. Halcampactiidce. 



Diagnosis: Athenaria without a spliincter or with a diffuse endodermal one. Acontia present. 



To this family I refer the below described Haliactis and the genus Halcampactis, summarily char- 

 terized by Farquhar (1898), with its two species mirabilis Farq. and duhia Stuck. Farquhar namely 

 states that the aboral end of Halcampactis is rounded and forms a physa and that there are "no sharply 

 defined circular muscles". Stuckey (1908, p. 387), not having had an occasion to see the type, is inclined 

 to take the genus to be a Sagartiid If Farquhar's informations are correct, the family keeps its present 

 name Halcampactiidae ; if, on the other hand, the sphincter afterwards should turn out to be mesogloeal, 

 the genus must be placed among the Andwakiidae, provided that the basilar muscles are absent, which is 

 likely, as Farquhar declares that the type-species has a rounded phj'sa. If Halcampactis has to be removed 

 from the family, it will be necessary to give it a new name, Haliactiidae. It is besides questionable if the genera 

 Ilyactis and Octophellia proposed by Andres, do not belong to this family. If their sphincters are endodermal 

 or no sphincter is present they probably do belong to it, if their sphincters are mesogloeal they are most 

 likely Andwakiids. 



Halcampactis is no doubt a species provided with brood-rooms. Farquhar namely says about 

 this species "I have found full-grown individuals with numerous young ones grouped around them, evidently 

 as they had attached themselves round the parent, when bom". 



Genus Haliactis nov. gen. 



Diagnosis: Halcampactiidae with rounded proximal body-end. Column not divisible into regions, 

 smooth, without papillae and spirocysts. No sphincter. Tentacles rather numerous, short, not swollen in 

 the apex, the inner longer than the outer. Two weak siphonoglyphes and two pairs of directive mesenteries. 

 Only 6 pairs of mesenteries perfect, imperfect mesenteries in several cycles. More than 6 perfect pairs fertile. 

 Distribution of the acontia on the mesenteries? 



Haliactis arctica n. .sp. 



PI. I. Fig. 31. 

 Diagnosis: Column elongated. Nematocysts in the column partly 13 — 17 X 1,5 y, partly 17—31 

 X 3.5—5 n, in the tentacles 20—31 x 2 /^ in the actinopharynx partly 14—17 X 1,5 //, partly 26—36 X 



