36 NILS ODHNER, NORTHERN AND ARCTIC INVERTBBRATES. III. OPISTHOBRANCHIA ETC. 



A. Gills oblong; rhinophores cylindrical, with a longitudinal furrow; radula 0.1.0 

 with 40 — 50 teeth Hermsea Loven. 



B. Gills inflated; rhinophores simple, conical; radula 0.1.0 with 15—21 teeth 



Stniger Ehrenberg. 



II. Body broad, ovate; no rhinophores nor oral tentacles; papillse in transverse rows on 



the sides of the back; anus dorsal, placed far back; radula 0.1.0 with 16—17 teeth 



Alderia Allman. 



Hermaea Lovén 1844. 



I. The branchiae broadly oblong, of differing size. The tips of the rhinophores with 

 a short lobe behind (the apex seems to be forked). Body white with red lines, 

 branchiae with red liver-processes. L. 24 mm. H. bifida (Montagu 1815). 



Pl. III fig. 29. 



II. The branchiae nearly linear, set in 8 rows. The tips of the rhinophores rounded. 

 Colour brownish green with branched greenish lines; branchise of the same colour. 

 L. 8—10 mm. H. dendritica (Ålder & Hancock 1843) 



= venosa Lovén 1844. 

 Pl. ni fig. 28. 



Stilig^er Ehrenberg 1831. 



Papillse 16 — 20 on each side, the largest innermost; rhinophores pointed, 

 as long as the anterior papillae; foot with projecting angles, narrowly produced be- 

 hind. Colour gray or blackish, marbled with Avhite; tail reddish white; rhinophores 

 grayish; at each side of the neck a dark line and inside them a light one with the 

 eyes on it. Close by the anus a dark hne curved backwards (due to the translucent 

 salivary gland). L. 7 mm. 



S. Mari£e (Meyer & Möbius 1865) =? Tergipes buUifer Lovén 1846.^ 



Ahleria Allman 1844. 



Head short with obtuse side-lobes. Processes in 6 — 7 rows, cylindrical with 

 rounded apex, longer towards the hinder end of the body. Foot very broad with 

 the margins deflected upwards. Colour yellowish or greenish, marbled with white. 

 L. 10 mm. A. modesta (Lovén 1844). 



Pl. n fig. 25. 



Fam. Elysiidce. 



Elysia Eisso 1812. 



Radula 0.1.0 with 40 — 50 teeth; anus dorsal. 



Colour brownish or blackisli to olive-green with shining red, blue and green 



^ Judging from specimens detenuined by Lovén and from a pictiirc of an uiidefiued Nudibranch, wbioli 

 seems to coirespond to Lovén's diagnosis of Tergipes bullifer, tbis species may be identieal with S. Maria?. 



