KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 41. N;0 4. 23 



Fam. Goniodorididae. 



I. Mantle not oovering the posterior part of the foot; back with two longitiidinal 

 cristaj between the rhinophores and tlie gills, and foot with a median one, nnited 

 with the hind mantle-margin ; papillse conical, sparsely set ; tentacles short, lobe- 

 shaped ; rhinophores laminated, their aperture smooth ; radula 5.1.0.1.5 



Doriduncnlus G. O. Särs. 

 II. Mantle without cristse ; club of the rhinophores laminated. 



A. Without cirri. 



1. Head covered by the mantle; tentacles replaced by a velum. 



a. R-hinophorial apertures with small lobes; papillse conical, close-set; lips 

 armed with fine hooks; penis Ukewise armed; radula (3 — 5). 1.0. 1.(3 — 5) 



Acanthodoris Gray. 

 h. Rhinophorial apertures smooth; gills simply pinnate. 



H-. Papillse big, club-like or broadly rounded; lips and penis unarmed; 

 ingluvies stalked ; gills 11 minute; radula with numerous teeth 



Adalaria Bergh; 



+ + . Papillse warty, globular or small, conical ; lips with a narrow ring 



of papill?e and two processes in the lower part of the oral aperture. 



ingluvies shortly stalked; glans penis bowed, unarmed; radula 



(1—2). 1.1. 1.(1— 2) or 1.1.0.1.1 Lamellidoris Ålder & Hancock. 



2. Head not covered by the mantle; tentacles = short side-lobes of the head; 

 lips with fine hooks; gills simply pinnate; mantle ending behind the gills; 

 ingluvies shortly stalked; penis armed with hooks; radula 1.1.0.1.1 



Goniodoris Forbes. 



B. With cirri. 



1. Cirri in the mantle-margin, which is prominent and continuous all around 

 the back; gills simply pinnate; no oral tentacles; lips armed with spines; 

 penis armed; radula 1.1.0.1.1 Idalia Leuckart. 



2. Cirri 2 in front of each rhinophore; mantle-margin indistinct; gills 3, tri- 

 pinnate, with 5 simple appendages outside; oral tentacles = side-lobes of 

 the head ; lips with rows of hooks ; penis armed with spines ; radula 

 1.1.1.1.1 Ancula Loven. 



Doriduncnlus G. O. Särs 1878. 



I. Gills 3, vpry raiiiute, before the amis. Coldur wliite: rliinopliores and gills påle yellow. L. 7 mm. 



I), echinulatus G. O. Saks 1878. 



n. Gills 5, minute, before the anus. Colour yellowish brown (in alcohol) L. 13 mm. 



D. pentabranchus n. sp. 



n. 1 figs. 22—23. 



Acanthodoris Gray 1850. 

 T. Gills 7—9, tripinnate; rhinophorial orifice with a few distinct lobes; radula 



