io6 



ACTINIARIA 



ever, be two cycles of tentacles as in other Peachia species. The little oral disc is provided with indistinct 

 radial furrows. The actinopharynx is long and has numerous longitudinal furrows (PI. i, fig. 30). I cannot 

 decide its length in proportion to that of the column, as the proximal part of the specimen was torn off. The 

 siphonoglyphe is very broad and smooth with well developed aboral prolongation. The conchula forms three 

 rectangular, flat lobes (PI. i, fig. 30) which are longer than they are broad, and in the apex pressed a little 

 in. On the figures of Danielssen and Koren (Fauna littoralis Norvegiae) it looks as if the conchula, in ex- 

 tended state, would be pedunculate; in the preserved specimen the conchula has no such 

 appearance, but the basal part of each specimen is built as in other threelobed Peachia- 

 species. 



Anatomical description: Only the distal part of the type-specimen being left, 

 and this piece not being well preserved, I cannot give any complete description of the 

 anatomy of this species. 



The nematocysts in the ectoderm of the column are numerous and 14 — 17 X (1,5) — 2 n 

 in size, those of the tentacles are still more numerous, 19 — 29 n long and 2 — 2,5 (i broad, so 

 are also the spirocysts, reaching a size of 14 x 1,5 — 26 x 2,5 ji. The nematocysts of the acti- 

 nopharj'nx are 24 — 26 « long and about 3,5 — 4 ^ broad. In all nematocysts the basal part to 

 the spiral thread is visible. The nematocysts of the actinopharynx are broader in the basal 

 end, the others of equal breadth. The siphonoglyphe is devoid of stinging capsules. The 

 longitudinal muscles of the tentacles form rather high folds, arranged like palisades. The sipho- 

 noglyphe is furnished with ectodermal longitudinal muscles which are wanting in the other 

 part of the actinopharynx. 



The arrangement of the mesenteries is probably like that of other Pe«t7n'rt-species. As 

 I have wished to save the specimen I cannot, however, give any exact informations con- 

 cerning the arrangement of the mesenteries. The pennons recall those of other Pcachia- 

 species; the folds are ver\- high and numerous, arranged like palisades and only a little 

 Textfig. 135. ramificated (textfig. 135, transverse-section of a perfect mesentery in the lower part of the 



Peachia boekii. 



Compare the text, actinopharynx). The parietal muscles on the pennon-side were well developed, those 

 on the opposite side of the pennons, on the other hand, not strong, and containing only a few folds, some 

 of which are rather high. A small oral stoma and a large marginal one are present, at least on the stron- 

 ger mesenteries. The mesogloea of the column was very thick, in proportion to that of other P^ac/iia-species ; 

 this fact is possibly connected with the strong contraction of the animal. 



Genus Haloclava Yerr. 



Diagnosis: Halcampoididae with a well developed, rounded aboral body-end, physa probably 

 not perforated by apertures. Column cylindrical with 20 longitudinal streaks of ampullaceous papillae in 

 the distal part; indistinctly divided into regions, without spirocysts and sphincter. Tentacles 20, in the apex 

 hemispherically swollen, forming acrospheres. Inner tentacles a little shorter than outer ones. A single ven- 

 tral siphonoglyphe well differentiated and provided with a well developed (always?) aboral prolongation. 



