34 NILS ODHNER, NORTHERN AND ARCTIC INVERTEBRATES. III. OPISTHOKRANCHIA ETC. 



Facelina Ålder & Hancock 1855. 



I. Rhinophores with 20 — 30 small rings of uniform size; papillse nearly cylindrical, 

 covering the whole back in 15 — 18 rows, of which 7 in the first, 5 in the 2nd 

 duster; on each side 4 — 6 dusters. Colour påle reddish; rhinophores yellow; 

 liver-processes yellowish red to brown, near their end a triangulär white spöt and 

 above it the white cnidocyst. Teeth of the radula with 9 denticles on each side. 

 L. to 35 mm. F. Drummondi (Thompson 1843). 



Pi. m fig. 27. 



II. lihinoiiliores with stroii.g lamiiue all arouml. 



A. lUiiiioiiliores witli 7 — 8 wide rings altenuitiiig with smaller ones ; gills in G — 7 dusters, cylindrical; the 

 foreniost groups, A\ith 20 — 30 each, united beliind the iliinophores. Colour white or reddish: papilhe 

 red with blnc lincs and wliitc tips. Teeth with 7 — 1^ denticles on eacli side. L. 25 mm. 



F. coronata (Fokbes 1839). 



II. Gills in 4 dusters, thin and tiliform, sometimes nearly halt' as long as the body. Colour pale rosy. 



gills light yellowish hrown, the rhinophores darker, the oral tentades rosy: all the processes with white 



tips. Teeth with 7 denticles on each side. L. 12 iiini. F. auriculata (^Muller ISOli). 



Fioiia Ålder & Hancock 1851 ■'. 



Papillee linear-conical, irregularly scattered över the sides of the back; oral ten- 

 tades linear, = the smooth rhinophores. Colour pale yellowish with a brilliant me- 

 tallic lustre; papillse brown with bluish white tips, their membrane reddish. Teeth 

 of the radula with 6 — 7 denticles on the sides of the central spine. L. about 60 mm. 



F. marina (Forskål 1775) = nobilis Aldbr & Hancock 1851*. 



Aiiti(»i»a, Ålder & Hancock 1848. 

 Jaiuis Verany 1844.' 



Papillse numerous, inflated, very dose-set at the sides of the body ; rhinophores 

 obliquely laminated, united by a crest at the base ; oral tentades very short, digiti- 

 form; head narrow. Body yellowish, transparent, papillse of the same colour, liver- 

 processes brown, at the tip forked, apices of the gills bluish. Radula 40.1.40. L. 

 about 30 mm. A. cristata (Delle Chiaje 1841). 



Hero LovÉN 1855. 

 Cloelia Lovén 1844."- 



Papillse 7 on each side, the first before the rhinophores, dichotomicajly branched; 

 in front of the head a distinct velum, concave in the middle. Colour yello\\'ish with 

 diffuse white döts, a white median line on the back and one at each side ; papillse 

 yellow. L. 17 mm. 



H. formosa (Lovén 1844) = Cloelia trilineata M. Särs 1850. 



1'1. III ligs. 30—32. 



^ The nanie Jauus was employed by Stevens in 1835 for an Ilymenojrterous insect, 

 ^ The luinie Cloelia was employed by Fitzixoee in 182() for a snake. 



