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



35 



Fam. Dotonidae. 

 Doto Oken 1815. 



Radula 0.1.0. 



I. Rhinophores thin, filiform, smooth, their sheaths with expanded margin ; papillae 

 stalked. 



A. Papillae 5—7 on each side, with 4 — 6 whorls of pointed tubercles ; velum abruptly 

 truncated. Colour yellowish with red spots, the points of the papillär tuber- 

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



D. coronata (Gmelin 1783). 



PL II tigs. 23—24. 



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

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

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

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

 25 mm. D. fragilis (Forbes 1838). 



PL 111 tigs. 33—34. 



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

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

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



D. crassicornis M. Sars 1870. 



Fam. Pleurophyllidiidse. 



Pleurophyllidia Meckel 1816. 

 Diphyllidia Cuvier 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. Loveni Bergh 1860 = Diphyllidia lineata Otto of Loven 1844. 



PL II tigs. 21—22. 



Fam. Pleuroleuridae. 



Pleurolettra Bergh 1874 b . 



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

 spots on the back. L. to 23 mm. (in the collections) P. Walteri Krause 1892. 



Fam. Hermaeidae. 



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

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



