20 NILS ODHNER, NORTHERN AND ARCTIC INVERTEBRATES. III. OPISTHOBRANCHIA ETC. 



B. Lips armed with 



1. smal] staves; tentacles digitiform ; foot incised in front; radula c».0.oo 

 (subfam. Discodoridinae). Gills simple-pinnate, 10, small; penis imarmed; 

 the inner laterals solid, less hamate, tlie outer ones thinner with longer 

 books, divided in the cusps Rostanga Bergh. 



2. small books; tentacles broad, flattened, triangulär; foot not incised in 

 front; radula oo.l.oo (subfam. Cadlininae). Gills tripinnate, 5, small; penis 

 with series of books; laterals hamate, serrated on the outer margin 



Cadlina Bergh. 



Bathydoris Bergh 1884. 



Body (ill alcoliol) iieariy gelatliious, on the bat-k almost transparent. Ivliinopbores and tentacles browu; 

 irills and outer genital organs orange-coloured: foot dark-erinison. L. 93 min. B. ingolHana Beegh 1899. 



Archidoris Bergh 1878. 

 I. Papillse wart-like, of varying size, irregularly distributed. Colour yellowish brown, 

 marbled with greenish, reddish or brownish spöts. L. up to 70 mm. 



A. tuberculata (Citvier 1804). 



Pl. II fig. 8; Pl. m %. 6. 



II. Papillse wart-like, of varying size ; the middle of the back with three longitudinal 



series of larger tubercles. Colour liglit reddish, towards the mantle-margin yellow. 



L. about 50 mm. A. nobilis (Loven manuscr.). 



Pl. I figs. 14—18. 



Joruiuia Bergh 1876. 

 Papillse not wart-like, bnt of uniform breadth or broader towards the end, fine 

 and densely set. Colour yellowish, sometimes with dark spöts; rhinophores brown. 

 L. to 40 mm. J. Johnstoni (Ålder & Hancock 1845*). 



Aldifsa Bergh 1878. 



l'aiiilhe conioal. t'oliiur ■wliitisb witli close ligbt döts; rbiiHii)bores and gills yellowish. Liver bliiish 

 showing tbrougb tlie skin. L. about 2(» mm, A. zctlaiidica (Aldee & Hak«hk 1855). 



Platydoris Bergh 1877. 

 Papillae of varying size, soft, wart-like ; mantle påle yellowish, spotted with 

 brown, the underside lemon-colovu'ed with brown döts and anastomosing lines; rhino- 

 phores yellowish ; gills 6 — 8, marbled with brown and white ; laterals of the radula 

 smooth. L. 42 mm. (in the coUections) P. planata (Ålder & Hancock 1846"). 



Pl. I figs. 19—20. 



Kostauga Bergh 1881. 

 Papillse small, close, square. Colour red with black döts; rhinophores yello- 

 wish, gills red. L. c. 12 mm. R. coccinea (Forbes 1843) 



Cadlina Beegh 1878. 

 I. Back with wart-like papillse; radula 22.1.22. Colour milk- white with one series 



