92 



l'AUL LØYNINf,. M.-N. Kl. 



C. pellucida (A. cV 11.) (jkay. 



I'l. II. Kig. 7. 



Found previously in tin Kiisliaiiialjord by AsiijøKNSK.N (1854), Sars 

 (1870) and W. C. Bro(;(;f.r (1872). Rare in 1919 and 1920, more com- 

 mon in 1 92 1. Length up to 30 mm. The rhinophores faintly tinged with 

 olive. Radula with up to 45 cross rows of teeth, minimum 30. Mature 

 specimens and spawn not observed. 



Genus 2. Galvina. (A. & H.). 



The diagosis of genus agrees with that given by Eliot (1910I. 



In the Drøbak Sound have been found representatives as well of G. 

 picta ( + var. pallida) as of G. exigua, but there is much to indicate that the 

 two presumptive species are only varieties of one and the same species, 

 numerous intermediate forms between them having been found, both with 

 regard to outer appearance and internal characters, the only real difference 

 between them being apparently the form of the spawn wich in G. picta is 

 ribbonlike and in G. exigua lump-like. All specimen from the Drøbak 

 Sound have been more or less brown-spotted and have on the whole 

 corresponded most nearly with the diagnosis of G. picta. Few have pos- 

 sessed the green colour pattern, the dark rings on the papillae and the two 

 rings on tentacles and rhinophores which are characteristic of G. exigua. 

 In the radula no definite difference can be traced between the supposed 

 two species. 



The reason why I have, after all, described the Drøbak Sound forms 

 of Galvina as two difterent species, is that I have found with the animals 

 also their respective forms of spawn. If however Meyer & Möbius' (1865 

 p. 36) observation of the spawn in G. exigua is confirmed by other scien- 

 tists there would seem to be no difference even in this respect between G. 

 picta and G. exigua, and no reason for keeping up the division into two species. 



G. picta. A. & H. 



PL II. Fi^. 8. 



New to the Kristianiafjord fauna. Rather common. Length up to 6 mm. 

 Spawn has been found from April to August; one mature individual 

 observed, Oct. loth 1920. 



Of the variety. 

 G. picta var. pallida. (A. & H.) Bergh. 



only 2 specimens have been found, measuring 3,5 mm and 2,5 m^. 



