KUNGL. SV. VET. AKADEMIKNS HANDLING AR. HAND 41. NiO 4. 



I!) 



DendroHotus Alder & Hancock 1845. 

 I. Velum with 4 — 6 ramose processes; papillae dorsales strongly branched; foot ta- 

 pering behind. Colour white, marbled with red and brown. Laterals 9 — 11 with 

 serrated margin. L. about 50 mm. 



D. frondosus (Ascanitjs 1774) = arborescens (Müller 1776). 



PI. Ill fig. 18; cf. I'l. [1 fig. 11. 

 Lam. med. and the outer laterals indistinctly serrated or smooth 



var. Dalli Bergh 1879. 



II. Velum widely expanded with numerous small lobes and two larger ones on each 

 side slightly branched. Colour pale reddish with white spots. Laterals 15 on each 

 side, smooth or with indistinct denticles. L. up to 90 mm. 



D. robustus Verrill 1870 = velifer G. 0. Sars 1878. 



Fam. Doridoxidae. 



Doridoxa Bergh 1899. 



Racliila a . 1 . go . 



Colour (in alcohol) yellowish white, the hack lighter. L. 12 nun. 1). ingolfiana Bergh 1899. 



Fam. Dorididae. 



I. Body nearly semiglobose; mantle-fold very small: papillae conical; gills in 6 — 10 fascicles: lips and penis 

 unarmed: tentacles large, a little flattened; radula a . 1.x (subfam. Bathydoridinse) Bathydoris Bergh. 



II. Body more or less depressed, oval ; mantle-margin moderately or very broad ; 



radula generally without lam. med. 



A. Lips unarmed; radula without lam. med., oo.0.<x. 



1. Tentacles small, tubercle-shaped; the back coarsely granulate or tubercu- 

 late ; foot without median furrow in front (subfam. Archidoridina?). Tentac- 

 les mostly with apical furrow ; gills tripinnate, 8 — 14; penis unarmed; late- 

 rals of the radula hamate, smooth Archidoris Bergh. 



2. Tentacles digitiform, tuberculiform or conical ; the back minutely granu- 

 late or villose ; foot incised in front. 



a. Branchial orifice with the margin smooth ; the back with numerous 

 close-set, small, almost linear papillae ; tentacles conical (subfam. Kentro- 

 doridinae). Gills tripinnate, 12 — 15, narrow; penis armed with a sti- 

 letto; laterals of the radula hamate, smooth Jorunna Bergh. 



b. Branchial orifice with the margin lobated or crenelated. 



+ . The back" villose by conical papillae; tentacles tuberculiform (subfam. Diaululinse). Gills 

 bipinnate, (i: penis unarmed: laterals erected, staff-like, serrated in the outer margin 



Aldisa Bergh. 



+ +. The back minutely granulate; mantle very large; tentacles digiti- 

 form (subfam. Platydoridinse). Gills tripinnate ; penis armed with 

 small hooks ; laterals hamate, smooth or denticulated 



Platydoris Bergh. 



