igS 



ACTINIARIA 



the above named papillae; in the distal part, where the spliincter is situated, strongly thickened as in Antho- 

 sactis. The spliincter recalls that of A nthosactis, sometimes it is wall-shaped, tliickened towards the ectoderm 

 as in Tealidium cingulatum. As the sphincter in different regions of the same specimens of ingolfi displays 

 both these appearances, I cannot find that the wall-shaped sphincter is efficient as a characterization of the 

 species T. cingulatum. The endodermal circular muscles are weak. The ectoderm of the tentacles is liigh 

 and contains very numerous spirocysts of varying size from ig x 2 /i to about 46 x 3 /i. The typical nema- 

 tocysts are very sparse here as in Anthosactis jan maycni, and 36 X 2,5 — 3 /i in size. That also here stinging 



batteries appear in the same places as in Anthosactis I have ascertained on 

 maceration preparations. The nematocysts were very close and were nmch 

 larger than in Anthosactis, in as much as they vary from 106 to 134 /^ inlenght 

 and II — 15/^ in breadth. They were of the same structure as in Anthosactis. 

 The inner tentacles are not provided with stinging batteries. It is true, that I 

 have at the apex of these tentacles found some scattered, large nematocysts 

 of the same size as in the stinging batteries, but a closer examination proved 

 that the nematocysts were sticking to the ectoderm and thus not belonging 

 to this part. The longitudinal muscles of the tentacles are ectodermal^ and 

 recall those of Anthosactis ingolfi (textfig. 188 transverse section of tentacle) as 

 regards the distribution of the muscles. The folds are closer than in A. in- 

 golfi. The niesogloea of the tentacles is from thick to rather thick, and some- 

 what swollen on the abaxial side at the base. The radial muscles of the oral 

 disc was badly preserved and, as far I can see, ectodermal. The ectoderm of the actinopharynx contains 

 typical nematocysts partly 29 — 30 X 3 // , partly 20 — 25x2,5// in size, besides these, there are sparse nema- 

 tocysts with discernible basal part to the spiral thread (length 26 — 36//, breadth 4 — $ fi). 



The mesenteries were in both specimens badly preserved and thin, so that I cannot give any informa- 

 tion concerning the muscles, on all accounts there are no distinct longitudinal pennons. Probably the muscles 

 of the mesenteries agree with those of Anthosactis ingolfi. The number of mesenteries was 48, 6 + 6 + 12 

 pairs, among these two directives, symmetrically situated. The first pairs are perfect, it seems, however, 

 that also a few of the second order reach the actinopharynx ; the mesenteries of the third order occupy one 

 half of the oral disc. The filaments were also badly preserved, the cnido-glandular tract contains very large 

 mucus cells. The species is dioecious, and all mesenteries have reproductive organs. 



Textfig. 188. Tealidium jungerseni 

 Transverse section of tentacle. 



Genus Epiparactis n. gen. 



Diagnosis: Paractiidae with well-developed pedal disc. Column not much elongated, smooth, 

 with thick cartilaginous niesogloea, without distinct margin. Sphincter not strong. Tentacles rather short, 

 the inner longer than the outer, conical, comparatively thin, whithout basal thickenings and stinging batteries 

 on the outside of their base, closely packed on the outer rim of the wide oral disc, arranged in at least two, 

 probably in three cycles. Longitudinal muscles of the tentacles and radial muscles of the oral disc ectodermal. 



^ Possibly some few folds may fuse together. 



