30 



NILS ODHNER, NORTHERN AND ARCTIC INVERTEBRATES. TIL OPISTHOBRANCHIA ETC. 



Tenripes Cuvier 1817. 



Khinopliores c. 3 times as long as the oral tentacles: papillae thicker towards the ends, i on each side, 

 the two front ones opposite each other, the back ones alternating; foot very narrow. Colour white with a green- 

 ish middle-line; rhinophores red at the base; papilla' olive-coloured, white towards the ends, red at the tips. 

 Radula with 22 teeth, the teeth with a strong central spine and (I denticles on each side. L. 8 nun. 



T. despectus (Johnston 1835). 



Forestia Trinchese 1881. 



Head drawn together behind: rhinophores a little < the oral tentacles: papillae in !l clusters on each 

 side. 3 in the 6 anterior clusters. 2 in the 3 posterior ones, stretched, conical. Colour of the head and of the 

 foot transparent white, back yellowish green with a white median line: papillae light yellow. L. 15 mm. 



V. albicans (Friele & Hansen 187(3). 



Embletonia Alder k Hancock 1851 '. 



I. Head-]obe semicircular with the sides a little produced; gills in 5 clusters on each 

 side, the 2 anterior with 3, the 3rd with 4, the posterior ones with 2 papillae 

 resp. ; tentacles close by each other. Colour yellow or reddish, on the head and 

 the anterior part of the back with brown to dark-violet, often confluent spots. 

 Teeth of the radula with a slightly prominent central spine and 6 — 7 close-set 

 denticles on each side. L. 7 mm. E. pallida Alder & Hancock 1855. 



II. Head-lobe rounded; gills 5 — 6 in a single series along each side; tentacles widely 

 separated. Colour reddish with white spots, gills orange-red, white-spotted. Teeth 

 of the radula as in the preceding species. L. about 4 mm. 



E. pulchra (Alder & Hancock 1844"). 



Amplioriua Quatrefages 1844. 



Body yellowish, head whitish, liver-processes brown, papillae with yellow rings, white-tipped; rhinophores 

 as long as the oral tentacles: papilla- in (i clusters with 2 — 3 each: anal papilla below the 4th cluster: foot 

 rounded in trout. 1,. 30 nun. A. Alberti Quatrefages 1844. 



Capellinia Trinchese 1874. 



Body elongated; rhinophores and oral tentacles of equal length; papillae in 

 6 — 7 clusters of 2 — 3 each, the first papilla? longest; each papilla with 2 — 3 cir- 

 cular swellings caused by the tuberous liver-process. Colour variegated white and 

 brown; the papilla? grayish, slightly spotted with brown, without bands; liver- pro- 

 cesses brown. L. 8 mm. C? fustifera (Loven 1846). 



PI. ill fig. 23. 



Gal vina Alder & Hancock 1855. 



I. Dorsal papilla? in at most 11 rows. 



A. Papillae with a ring near the tips, but without bands, 



1. in 7—8 rows of 5 — 6 each, ovate, tapering. Colour white with scattered reddish yellow and 

 opaque white spots, also on the papilla- : rhinophores and tentacles with red bands: near the tops 

 of the papilla- usually a minute orange ring; radula with 4 denticles on each side of the central 

 spine; laterals with a small spine by the base. L. 12 mm. 



G. picta (xVldek & Hancock 1842). 



2. in 9—10 rows of 3 — 4 each, ovate-oblong. Colour yellowish white or purplish, spotted with 

 yellow: papillae, rhinophores and tentacles orange below the white tips; central teeth of the radula 

 with 4 — 5 denticles, lateral spines broad. L. 10 mm. G. Farrani (Alder. & Hancock 1844 a ). 



