172 



ACTINIARIA 



North Atlantic. 6453' N. 10 E. 600 m. Bottom temp. 0,69 (Michael Sars-Exp. 



1910 St. 10). 



Norway. Finmark. Kvaenangen (Aurivillius). Ogsfiord 100 m. Bottom temp. 

 2,1 (Nordgaard). Kvalsund 20 fms. (Sw. Spitzberg-Exp. 1861). Grot- 

 sund 70 fms. (Goes & Malmgren). Grotsund Finkroken low- water stand 

 (Sw. Spitzberg-Exp. 1861). Ulfsfiord. Kjosen low-water stand (Sw. Spitz- 

 berg-Exp. 1861). Vardo. 



Kola peninsula. Ladigino. 6636'5 N. 4i23' E. 65 m. Kildin Sound 692i' N. 

 345' E. 86 m (Romer & Schaudinn St. 56, 59). W. of Kolgujew 

 69i4' N. 4639'3O E. 62 m (Andrei Perwoswanny-Exp.). Chewanna 

 30 fms. (Sandeberg 1877). 

 Kara Sea. 49 fms. (Dijmphna-Exp.). 



Arctic Sea of Siberia. 6932 ; N. 177 41' E. (Vega-Exp.). f>fj' N. i7324' W. 9 15 



fms. (Vega-Exp.). 2 miles N. of the winter-harbour of the 

 Vega 12 fms. N. N. W. of the winter-harbour of the Vega 

 12 fms. (Vega-Exp.). 

 Behring's Sea. Behring Isl. 65 75 fms. (Vega-Exp.) ; 65i4' N. i6835' W. 29 fms. 



(Vega-Exp.) ; 623g' N. I775' W. 55 fms. (Vega-Exp.) 



Further distribution: Arctic America to Cape Cod (teste Verrill. This statement needs con- 

 firmation). George's and Brown's Banks (teste Verrill). Passammoqvoddy Bay (teste Me. Murrich). Grand 

 Menan (teste Stimpson). Labrador (teste Packard). Murman Sea 795' N. 6i23' E. 203 m (teste Maren- 

 zeller)? Olenja Guba. ?Pala Cuba (teste Pax). 



This form, "the true Urticina crassicornis of the north" (Verrill 1868 p. 470) has undoubtedly been 

 described by Me. Murrich 1911. I have not much to add to the description given by Me. Murrich. The 

 column of all specimens was smooth without verrucae. Only in one specimen (from Recherche Bay) the 

 column was provided with spots, recalling contracted verrucae. A nearer examination of these formations, 

 however, showed that they were not verrucae but probably only pigment spots. Like Me. Murrich I have 

 found that the longitudinal muscles of the tentacles are sometimes ectodermal. In a small specimen, exam- 

 ined by myself, the longitudinal muscles of the tentacles, as well as the radial muscles of the oral disc, were 

 ectodermal. The greatest number of the tentacles was about 160, that of the pairs of mesenteries 83 (in a 

 specimen from the Tjalfe-Expedition). The number of mesenteries was sometimes different in both sides of 

 the directive plane (compare the table). Concerning the distribution of the reproductive organs I cannot 

 decide whether the same mesenteries as in U. felina coriacea are fertile. In a specimen from Greenland there 

 are probably 10 primary pairs of mesenteries sterile. Commonly the 20 first pairs are sterile, in the specimen 

 with 83 pairs of mesenteries the reproductive organs were probably present only on the mesenteries of the 

 fourth cycle (compare Me. Murrich 1911 p. 73). Thus it is probable that the generating region moves during 

 the lifetime of the animal as in U. felina coriacea. In many specimens there were numerous embryos in the 

 coelenteric cavity. 



