NORWEGIAN OPISTHOBRANCHIATE MOLLUSCA 



27 



The colour is, according to Friele & Hansen 1876 ^ who 

 observed the animal alive, whitish, with yellow-green tips of 

 gills and rhinophores, as well as the points of most of the 

 lappets of the notum. 



The whole integument is tissued by a net of elongated 

 spicules, which are arranged in bristles in the läppest of the 

 notum as well as in the crests, and give support to them. 



Except the description given by Friele & Hansen in 1876 

 (in Norwegian), and the drawing of the radula published by G. 

 O. Sars, nothing has hitherto 

 been known on this form of Nudi- 

 branchia. It was established on 

 a single specimen dredged in 

 the Fjord of Bergen, 20 fa- 

 thoms, stony ground. No figure 

 accompanied the description. The 

 animal was referred by the au- 

 thors to the genus Goniodoris 

 but G. Sars, as mentioned, 

 in 1878 made it the type of a distinct genus, Lophodoris, which 

 he constituted as a mere name. The separation is well justified, 

 as this type of nudibranch differs, in many respects, from the 

 true Goniodoris, which, however, seems to be its nearest 

 ally. Lophodoris differs in its wide notum which covers the 

 head and passes into the velum in front. An other disting- 

 uishing character, which the generic name alludes to, is the high 

 dorsal crest, a feature not met with in Goniodoris except 

 in G. barroisi described by Vayssière in 1901^. Here a small 

 dorsal crest is present on the notum and another on the foot» 

 but they are not serrated in the margin. This species, in 



. 10. Pharyngeal bulb of L. 

 danielsseni (cf. p. 47). 



1 Bidrag til Kundskaben om de norske Nudibranchier. Forhandl. Viden- 

 skabs-Selskabet i Christiania 1875. Chr. 1876. 



2 Recherches Zool. ct. anat. sur les Moll. Opisthobranches du Golfe de 

 Marseille. III. Ann. Mus. Nat. Hist. Marseille, T. VI. 



