1922. No. 6. XL'DIBRANCHFAUNAEN I DROBAKSUXDET. 93 



Galvina exigua. (A. & H.). 



PI. II. Fig. 9. 



New to the Kristianialjord fauna. Rather common. Length up to 12 

 mm. The .spawn ha.s been found in all seasons. 



B. Uniseriatae. 

 Gen. 3. Facelina (A. & H.) Bergh. 



In the diagnosis of the genus ought to be stated: "The rhinophors 

 perfoliate, annulate or almost smooth"; as for the rest corresponding to 

 the diagnosis o{ Bergh (1885, p. 41). 



F. drammondi. (Thompso.x) Bergh. 



PI. III. Fig. 10. 



New to the Kristianialjord fauna'. \'ery common. Length up to 40 mm. 

 The red colour of the buccal bulb often wanting. The rhinophors of small 

 specimens almost smooth, those of bigger ones annulate, those of the big- 

 gest specimens perfoliate in the upper part (always less than 20 rings). 

 The number of cerata varying. The colour of the liverprocesses varying 

 in yellow, red and brown. The white spot in the tip of the cerata not 

 always distinctly triangular. Radula often with less (14) than 16 teeth. 

 Spawning season J ulv and August. The spawn is threadshaped, zig-zagged 

 and spiral curved with up to 6 coils. The spawn is disposed on algae or 

 Zostera. When the animal is irritated, it can easily get rid of the cerata by 

 autotomy. 



Genus 4. Amphorina (Ouatrefages) Bergh. 



The diagnosis of the genus agrees with Bergh's (1882, p. 54). In the 

 Drebak Sound 2 species of the genus were found which had previously 

 been classified as belonging to the Genus Ciiilioria (A. & H.) and Cratcna 

 (Bergh), but which Eliot (1910, p. 172I conciders as belonging to the 

 Genus Amphorina (Ouatrefages). 



A. aurantiaca. (A. & H.). Eliot. 



PI. III. Fig. II. 



New to the Kristianialjord fauna. Very common. Length up to 18 mm. 

 Cerata often clavated. The orange coloration on the tops may be faint, 

 especially in young specimens. The colour of the liver-processes varies 

 from pale yellow to dark red. This colouring may in some specimens 

 continue in the liver ducts and even the stomach may be seen coloured 

 in the same manner as the liver-processes. In such specimens the food 



' See "Merknad" in the Introduction. 



