i68 



ACTINIARIA 



smaller than those mentioned above had no reproductive organs developed) the six first pairs are sterile, 

 in older ones the 10 first pairs (the first decade) are devoid of reproductive organs, and in large specimens the 

 sterility sets in with the 20 oldest pairs; in other words the generating region moves during the life- 

 time of the animal to more and more younger mesenteries, simultaneously with the increase 

 in the number of mesenteries. A similar, though less positive case I have observed in Allantactis parasitica, 

 in which the mesenteries of the second cycle sometimes are sterile. Commonly the distribution of the repro- 

 ductive organs in the Actiniaria is constant or almost so, especially the forms in which the first order of 

 mesenteries is fertile; though it is possible that sometimes such a moving of the reproductive organs takes 

 place. I especially think of such forms as Bolocera, in which the distribution of the reproductive organs 

 varies. 



The size of the nematocysts is shown on the following table. 



The specimens i and 6 were rather well expanded, the others much contracted. The size of the spiro- 

 cysts was in the spec. I, 24 X 1,5 50 X 2,5 p, in the spec. 3, 22 X I 46 X 2 //, in the spec. 7, 14 X 124 X 2 //. 

 The nematocysts of the column were in the column of the specimen i, 1926 X(i,5) 2 p, in that of the 

 specimen 6, 12 19 X 1,5 2 p. In the column I have also found scattered spirocysts. Smaller nematocysts 

 than the above named I have observed in the column and in the tentacles, but they are very rare (compare 

 lofotensis and crassicornis). 



Urticina felina lofotensis. 



Madoniactis lofotensis n. sp. Danielssen 1890 p. 47 PI. i fig. 5 (p. p.). 



Urticina crassicornis f. laevis Carlgren in Appellof 1900 p. 4. 



Tealia lofotensis (Dan.) Carlgren 1902 p. 42. ^ 



Rhodactinia crassicornis (Mull.) Walton 1908 p. 218, Arndt 1912 p. 124. 



?Rhodactinia davisii Agas. Verrill 1864 p. 18 (p. p.). 



?Bolocera eques n. sp. Gosse 1860 p. 351 PI. 9 fig. 6. 



? Gos. Norman 1868 p. 318, Stephenson 1918 b p. 112. 



Diagnosis: Compare p. 162. 



Colour: Column and pedal disc yellowish-red with dark-red partly stripes and partly patches. 

 Tentacles transparent, pale yellowish-red with i to 2 broad, red annuli besides the one at the base. Oral 

 disc rose-coloured with fine, red folds, issuing from a red annulus round the mouth and extending towards the 



