ACTIN1ARIA 



169 



tentacles, where they form a bright-red annulus (Madoniactis Danielssen). Column dirty-yellow, brownish 

 or brown-red, sometimes with red or reddish, longitudinal spots. Tentacles sometimes uncoloured, sometimes 

 dirty-yellow, brownish or brown-red, frequently with more or less distinct, paler or darker transverse bands, 

 sometimes the tentacles are crimson-coloured (U. crassicornis f. laevis Ap pell of). Compare also Walton 

 1908 p. 218 219. 



Dimensions in contracted state unto about 5,5 cm broad and 2,5 cm high. 



Occurrence, compare U.felina coriacea. 



Exterior aspect. The type-specimen, dredged by Danielssen, was much contracted in oral- 

 aboral direction. Therefore I cannot decide, whether the column is furnished with small verrucae or not, 

 but Danielssen declares that there are 

 such. Besides, the description of the spe- 

 cies, given by Danielssen, has beencom- 

 pilated also from Metridium senile (dian- 

 thus) (compare Carlgren 1902 p. 42). 

 Appellof 's specimens (Appellof 1900 

 p. 4) as also those collected by Nord- 

 gaard, are provided with small verrucae. 

 In the not sexually ripe specimen, dred- 

 ged by Mortensen S. of Bornholm, I 

 cannot see any verrucae by aid of a 

 magnifier, but on the sections there are 

 scattered excavations in the column, in- 

 dicating the presence of small verrucae. C 

 Therefore I think that this specimen is 

 forma lofotcnsis and not crassicornis. 



Anatomical description: Con- 

 cerning the anatomy of this form I have 

 not much to say. Small specimens agree with such of U. felina coriacea, in as much as the longitudinal 

 muscles of the tentacles and the radial muscles of the oral disc are ectodermal (textfig. 176, 177). The 

 sphincter of the Bornholm-specimen (fig. 175) differs somewhat from the typical appearance of the sphincter 

 of Urticina. The size of the nematocysts () and spirocysts (sp) of some specimens I have given below. 



Fig. 177 



Textfigs. 175- 177. Urticina felina lofotensis from Bornholm. 



Transverse sections of the sphincter (fig. 175) of a part of the oral disc 



(fig. 176) and of a part of a tentacle (fig. 177). 



The Ingolf-Expedition. V. 9. 



22 



