196 



ACTINIARIA 



A. jan mayeni and A. excavata the muscles are not enclosed in the mesogloea but ectodermal. In the upper 

 part of the tentacles the longitudinal muscles are weaker and uniformly distributed. The radial muscles of 

 the oral disc is weak and ectodermal. The ectoderm of the actinopharynx contains rather few nematocysts 

 with discernible basal part to the spiral thread, 26 34 X 5 (i in size. I have besides in the maceration pre- 

 parations found some small nematocysts and some spirocysts, but whether they belong to the actinopharynx 

 or stick to the ectoderm, I cannot decide. The siphonoglyphes do not seem to be as sharply marked as in 

 A . jan mayeni. 



Both specimens had 24 pairs of mesenteries, hexamerously arranged. Only the 6 first pairs were per- 

 fect. The mesenteries were in both specimens much thinner than in A . fan mayeni, the folds of the longitudinal 

 muscles are low and form no pennons. The parietobasilar muscles recall those of A. jan mayeni, but are 

 weaker. The filaments have the same appearance as in this species. All mesenteries are fertile and provided 

 with filaments. The animal is dioecious. 



Genus Tealidium R. Hertw. 



Diagnosis: Paractiidae with well-developed, enlarged basal disc. Column with numerous small 

 papillae of the mesogloea, all of the same size, with more or less distinct longitudinal furrows, in contracted 

 state very low, disc-like. Sphincter mesogloeal, very strong, in certain states of contraction issuing as a strong 

 circular fold in the uppermost part of the column. Tentacles short, conical, hexamerously arranged, not 

 numerous, the inner longer than the outer or almost of the same length. Stinging battery on the outer ten- 

 tacles as in Anthosactis. Longitudinal muscles of the tentacles and radial muscles of the oral disc ectodermal. 

 Oral disc wide. Actinopharynx short with two distinct siphonoglyphes. Pairs of mesenteries few, hexamerous- 

 ly arranged, thin and with probably weak muscles. 6 pairs, or a few more, perfect. Reproductive organs 

 appearing already on the mesenteries of the first cycle incl. the directives. 



The genus Tealidium is nearly related to Anthosactis with which it agrees in most characters, among 

 others in the presence of the stinging batteries on the outside of the outermost tentacles. The nematocysts 

 of these batteries are also of the same type as in Anthosactis. In contradistinction to Anthosactis its column 

 is provided with very numerous, small mesogloea-papillae. Concerning the ectoderm of these papillae I cannot 

 give any informations, as the ectoderm was lost in the specimens of T. ingolfi, as well as in the type-species. 



The diagnosis of the genus, given by R. Hert wig, is not good, as among the proposed genus-characters 

 only one the presence of the above named papillae is preservable. The tentacles of the species, described 

 below, are namely of different length. It is also questionable, if in T. cingulatum the form of the sphincter 

 may serve as a diagnostic. I, for my part, am more inclined to regard the wall-shaped thickening of the meso- 

 gloea in the sphincter region as due to a strong contraction of this part, because in the species, described below, 

 and in one and the same specimen, the appearance of the sphincter varies in different places, evidently accord- 

 ing to the state of contraction, and now recalls the sphincter of T. cingulatum, now is typically elongated. 



The species Tealidium cinctum (Stuckey. Trans. New Zeeland Instit. 41. 1908-1909^.389) is certainly 

 no Tealidium. Stuckey namely declares that the species is provided with "verrucae, which act as suckers, 

 by which the animal covers itself with bits of shell and other debris." In the real Tealidium no sucking- 



