KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 41. N:0 4. 35 



Fam. Dotonidae. 



Doto Oken 1815. 



Radula 0.1.0. 

 I. Rliinophores thin, filiform, smooth, their sheaths witli expanded margin; papillse 

 stalked. 



A. Papillae 5—7 on each side, vv^ith 4 — 6 whoiis of pointed tubercles ; veluni abruptly 

 truncated. Colour yellowish with red spöts, the points of the papillar tuber- 

 cles crimson. Teeth denticiilated. L. about 12 mm. 



D. coronata (Gmelin 1783). 



Pl. II figs. 23—24. 

 B. Papillfe 6 — 7 on each side, thick, with 7—9 whorls of blunt papillaä or lobes; 

 velum rounded in front and at tlie sides. Colour yellowish brown or olive- 

 tinged; rhinophores brown with white tips; papillse yellowish or reddish brown, 

 finely white-punctured. Teeth of the radula smooth or subdenticulated. L. 

 25 mm. D. fragilis (Forbes 1838). 



Pl. III iigs. .33—34. 



II. Rhinophores very thick, short and distinctly annulated, with short, non-expanded 



sheaths; papillee 4 — 6 on each side, not stalked, with 3 whorls of tubercles; velum 



semilunar, rounded. Colour yellowish brown, the papillee white-spotted. L. 5—6 mm. 



D. crassicornis M. Sars 1870. 



Fam. Pleurophyllidiidae. 



Phniro](lijlli(1ia Megkel 1816. 

 Diphyllidia Citvier 1817. 



Radula with the lam. med. denticulated at the sides of the strong central 

 spine ; lam. lat. serrated. Colour reddish brown with white longitudinal raised lines 

 on the back. L. to 47 mm. 



P. Lovéni Bergh 1860 = Diphyllidia lineata Otto of Loven 1844. 



Pl. II figs. 21—22. 



Fam. Pleuroleuridse. 



Pleuroleura Bebgh 1874*'. 



Laterals of the radula smooth. Colour (in alcohol) yellowish gray with light 

 spöts on the back. L. to 23 mm. (in the coUections) P. Walteri Krause 1892. 



Fam. Hermseidae. 



I. Body slender, tapering towards the end; no oral tentacles; gills on the sides of 

 the body ; anus in the före part of the back. 



