ACTINIARIA 



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 th^ tentacles are crimson-coloured [U. crassicornis f. laevis Appellof). Compare also Walton 

 1908 p. 218 — 219. 



Dimensions in contracted state unto about 5,5 cm broad and 2,3 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, givenby Danielssen, has beencom- 

 pilated also frona Metridium senile {dian- 

 thus) (compare C a rig r en 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. y 

 Therefore I think that this specimen is 

 forma lofotensis and not crassicornis. 



Anatomical description: Con- 

 cerning the anatomy of tins 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 a;nd the radial muscles of the oral disc are ectodermal (textfig. 176, 177). The 

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

 of Urticina. The size of the nematocysts {n) and spirocysts [sf) of some specimens I have given below. 



Fig- 175 



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-Expedi[ioD. V. 9. 



