KUNGL. SV. VET. AKABEMIENS HANDLING AR. BAND 41. N:0 4. 



33 



rhinophores distinctly less than the oral tentacles. Colour white, gills 

 rusty brown, with white ends. L. 18 mm. 



C. verrucosa (M. Sars 1829). 

 B. Laterals of the radula smooth; lam. med. with 6—9 denticles on each side; 

 rhinophores slightly wrinkled; papillae in at most 50 rows with 8 — 11 each; 

 margin of the back prominent over the sides; anus behind the middle of the 

 right side; rhinophores much larger than the oral tentacles. Colour yellow- 

 ish white with a white line on the tail ; tentacles reddish ; gills reddish brown, 

 their tips white-spotted, sometimes with rings. L. to 33 mm. 



C. Stimpsoni Verrill 1880. 

 The lam. med. without denticles var. lsevidens Knipowitsch 1902. 



Chlamylla Bergh 1886. 



1. Teeth of the radula very indistinctly denticulated, the median ones only with a 

 strong spine at each side; back with wing-like projecting margins; foot rounded 

 in front; head not expanded at the sides. Radula with 17 rows. Colour (in 

 alcohol) yellowish ; mantle-margin gray ; papilla? with white tips. L. 40 mm. 



C. borealis Bergh 1886. 



II. Teeth of the radula, at least the median ones, strongly denticulated ; head ex- 

 panded at the sides. 



A. Oral tentacles < the rhinophores; foot with the anterior angles slightly pro- 

 jecting. Radula with 13 — 17 denticles in the lateral teeth and with 8 — 9 or 

 13 — 15 at each side of the median ones. Colour (in alcohol) yellowish. L. 

 23 mm. C. typica (Bergh 1886). 



B. Oral tentacles = the rhinophores. 



1. Body without fold at the right side; mantle-margin rather prominent ; foot 

 with produced angles; lateral teeth smooth. Colour (in alcohol) yellowish. 

 L. 27 mm. C. intermedia (Bergh 1899). 



2. Body with a cutaneous longitudinal fold in front of the right side; foot 

 rounded ; lateral teeth finely denticulated. Colour (in alcohol) yellowish. 

 L. 55 mm. C. atypica (Bergh 1899). 



Favorinus Gray 1850. 



I. Papillae in 5 — 6 clusters, which are nearly contiguous across the back, the 2 first ones 

 of 2, the rest of 1 row, each containing 6 — 7 papillae. Colour white, rhinophores 

 brown up to the bulbus, gills white with yellow liver-processes and an olive-green 

 ring near the apex. Teeth of the radula with a single central spine, no denticles. 

 L. 12—25 mm. F. albus (Alder & Hancock 1844 a ). 



PI. TIT figs. 24 — 25. 



TI. Papillae in 1 — (! separated clusters, in the first one 2 rows of :•! papilla;, in the 2nd the same ami in ihr 

 3rd 1 row with 3 papillae; the rhinophores strongly annulated. Colour transparent while with opaque white, 

 sometimes yellow, spots, the rhinophores brown-spotted or blackish, white-tipped. Radula with <; denticles 

 (in each side of the teeth. L. 3,5 nun. ( Hergh 1878) F. brancbialis (Müller 1806). 



K. St. Vet. Akad. Hand], Band 41. N:o 4 5 



