. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 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 —219. Dimensions in contracted state unto about 5,5 cm broad and 2,3 cm high. Occ
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 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 —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- 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 Fig- 175 Fig. 177 Textfigs. 175—177. Urti
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