KUNGL. SV. VET. AKADEMIE NS HANDLING AR. BAND 41. N:u 4. 



25 



2. dills 10; tubercles small, blunt. Mantle white, somewhat reddish, with 

 brown spots. L. 12 mm. L. inconspicua (Alder & Hancock 1845 a ). 



B. Laterals without hook near the apex, strongly curved, almost forming an angle in the middle: papillae 

 elongate-conical: foot narrow, extended beyond the mantle behind, with a dorsal keel. Colour transparent 

 white, spotted with red; a yellow hand along each side of the back. L. li mm. 



L. luteocincta (M. Saks 1870). 



Corpore ovato-depressiusculo, albo, hepate tarnen fusco pellucente; pallio tuberculato, minute cicatricoso; 

 branchiis 6 — 7.» L. 10 mm. L? acutiuscula (Möller 1842). 1 



Groniodoriis Forbes 1840. 



I. Pallial margin smooth or slightly undulating, usually erect, incised in the middle 

 behind. Along the middle and the sides of the back a tubercled fold. Gills 13. 

 Sides of the body smooth. Colour white or yellowish with a rosy tinge ; mantle 

 with opaque white or yellow spots; rhinophores yellow; gills transparent. L. 14 mm. 



G. nodosa (Montagu 1808). 



PI. Ill fig. 15. 



LT. Pallial margin furnished with spots with regular interspaces; gills (!(?) in an incomplete circle. Color white, 

 mantle-margin, front of the head and the tips of the rhinophores and those of the gills yellowish green. 

 L. 8 mm. G. Danielsseni Feiele A' Hansex 1870. 



[dalia Leuckart 1828 



1. The middle of the back with 4 — 5 cirri: lips with a ring of hooks: inner lam. lat. of the radula smooth 

 (subg. Idalia). 



Gills 18: mantle-margin with 2 long, tentacle-shaped cirri in the front, with short papillae along the 

 sides and with small lobes behind. Colour rosy to whitish, cirri orange, the rhinophores reddish towards 

 the ends. L. unto 38 mm. I. elegans Leuckart 1828. 



II. The middle of the back without cirri; lips with a spiny lamina on each side; 

 inner lam. lat. of the radula denticulated (subg. Idaliella Bergh 1881). 



A. Gills 9, the posterior ones shortest; mantle-margin in the front with 4 long, 

 filiform cirri, on the sides with 2 or 3 very short ones, and behind at the 

 sides of the gills with a long bifid process; the upper 7 4 of the rhinophores 

 laminated ; the base of the inner laterals much produced diagonally. Colour 

 whitish with light dots. L. 9 mm. I. pulchella Alder & Hancock 1855. 

 Gills 10; lateral appendages of the mantle 6 on each side, simple, of equal 

 length. Colour dark-brownish, lighter along the sides. L. 13 mm. 



var. fusca n. n. = cirrigera Philippi of Loven 1846. 



PL II fig. 19. 



B. Gills 10, short, of equal length, the anterior and posterior ones bifid (the 

 branchial rosette consequently with 12 points); mantle forming a very narrow 

 area with 2 — 3 lateral appendages and a short posterior one; the rhinophores 

 laminated from top to base ; the inner laterals with rather broad and short 

 base. Colour yellowish with brown and orange spots. L. c. 13 mm. 



I. aspersa Alder & Hancock 1845 '. 



1 Mörch includes (1877) this species in Lamellidoris: no later description being published about it, 

 Möller's diagnosis is given above. 



K. Sv. Vet. Akad. Hand], Band 41. N:o 4. i 



