^ , ACTINIARIA 



224 



116, 167 — teste Pax). Pala Guba (teste Pax). Barent Sea 

 70°2i'3oN. 53°5o' E. 105 m. (Andrej Perwoswanny-Exp. 1903). 

 W. from Kolgujew 69°i4' N. 46°39'30 E. 62 m (Andrej Per- 

 woswanny-Exp. 1903). 

 Kara Sea. 70°9o' N. 64°i7' E. 11 fms. (New-Zembla-Exp. 1875) — (Dijmphna-Exp.). 

 Arctic Sea of Siberia. 20° E. of Cape Jakan 12 fms. (Vega- Exp. No. 60). 69°32' N. 



i77°4i'W. 12 fms. (Vega-Exp.). 67°7' N. i73°24' W. 9—15 

 fms. (Vega-Exp. No. 185), 2 miles N. E. of the winter 

 station of the Vega 12 fms. (Vega-Exp. 1879). 

 Behring Sea. 64=34' N. i7i°45' W. 25 fms. (Vega-Exp. No. 1061), 63=39' N. I77°5' W. 

 55 fms. (Vega-Exp. No. 1068). 

 Exterior aspect: The pedal disc is now rather wide, now of rather small diameter and provided 

 with more or less distinctly conspicuous, radial ridges and furrows, sometimes the central part of it is drawn 

 out in a conical tap as in Stomphia. The form of the body varies considerably, according to the state of con- 

 traction. Now it is cup-like, now more cylindrical, in preserved specimens the breadth generally is larger 

 than the length, it is rarely the opposite. As the oral disc is wholly unfolded, the distal part is broader than 

 the proximal. In small specimens — such which occur in the coelenteric cavity or in the open sea — the 

 column is provided with distinct longitudinal ridges with deep furrows between. Also in larger specimens 

 traces of these ridges are to be seen. They but rarely appear like a folded longitudinal ribbon; often 

 when the ridges arise, there are also transversal furrows which make the animal look as if it were provided with 

 longitudinal rows of tubercles, such as Kwietniewski 1898 has reproduced Actinostola walteri. Sometimes the 

 surface is smooth or irregularly wrinkled. Though no fossa is present, the margin is, however, rather well 

 marked.The region of the sphincter is sometimes thickened and forms a circular wall, in which case the sphincter 

 is strongly concentrated, owing to the contraction. The tentacles are hexamerously arranged in 6 cycles, the 

 last cycle is, however, as far I have seen, always imperfect. The number of tentacles in several large exam- 

 ined specimens varied between 130 and 170. Kwietniewski declares that A. walteri has about 192 tentacles. 

 From his description it seems as if he has not counted them. The inner tentacles are considerably longer 

 than the more or less papilliform outer ones. On very small specimens, as on young in the coelenteric cavity, 

 they are smooth or almost so, on larger specimens they are indistinctly longitudinally furrowed or irregularly 

 wrinkled. They have never any thickenings on the outside of the base. The oral disc is wide, and provided 

 with deep or shallow radial furrows, in contracted state also with circular furrows. The actinopharynx is of 

 ordinary length and longitudinally sulcated, the folds are, however, not as numerous as in the Stomphia- 

 species described below, amounting to about 10 on each side of the directive plane. The gonidial tubercles 

 are distinct, the siphonoglyphes very well marked, broad and provided with long aboral prolongations. 



Anatomical description: The anatomy of this species has been described by myself 1893 and 

 1902, and I have but little to add now as my latest examinations have been made on a richer material and 

 mainly verify my former observations. Concerning the stinging capsules, there are in the tentacles typical 

 nematocysts in varying numbers, now numerous, now more sparse, in addition to numerous spirocysts ; in one 



