30 N3LS ODHNER, NORTHERN AND ARCTIC INVERTEBRATES. III. OPISTHOBBANCHIÄ ETC. 



Tergipes Cuvier 1817. 



JUiiuoiilioves c. o tillies a.s loiig as the oral tentacles; papillie thicker towanls the eiiils, 4 ou eacli side. 

 tlic two front ones opposite each other, the back ones alternating: foot veiy narrow. Coloui- white witli a greeu- 

 ish iiiiddle-line ; rhinophores red at the base; papilhi' oli\e-coloaied. white towards the ends. red at the tips. 

 Radula with 22 teeth. the teeth with a strong central si)ine and (i denticles on each side. 1,. s min. 



T. de.spectus (.JohnsT(in 1835). 



Forestia Trinchese 1881. 



Head drawu tog-cther behind : rhinojiliores a little < tlie oral tentacles ; papilhe in il dusters on each 

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

 foot transparent white, back yellowish green -with a \Yliite median line: papilhe light yellow. L. 15 mm. 



F. albicans (Fmele & Hansf.x 1876). 



Eiubh'l(uiia Ålder & Hancock 1851''. 



I. Head-lobe semicircular with the sides a little produced; gills in 5 dusters 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 spöts. 

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

 denticles on each side. L. 7 mra. E. pallida Alöer & Hancock 1855. 



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

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

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



E. pulchra (Ålder & Hancock 1844"). 



Amphoriiia Quatrefages 1844. 



Body yellowish. head whitisli, livev-processes brown, papilhe with yellow rings, white-tipped: rhinophores 

 as long as the oral tentacles: papilhe in (i dusters with 2 — 3 each: anal papilla below the 4th duster: foot 

 rounded in iront. L. 30 mm. A. Alberti (iIuatrefages 1844. 



Capelliiiia Trinchese 1874. 



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

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

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

 brown ; the papillae grayish, slightty spotted with brown, without bands ; liver-pro- 

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



VI. 111 tig. 23. 



Oalvina Ålder & Hancock 1855. 



I. Dorsal papill* in at most 1 1 rows. 



A. Papilhe 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 spöts, also on the papillffi; rhinophores and tentacles with red bands: near the tops 

 of the papillffi 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 inni. 



G. picta (Ålder & Hascock 1842). 



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

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

 with 4 — 5 denticles, lateral spines broad. L. 10 mm. (1. Farrani (Aldee & Haxcock 1844-''). 



