18 NILS ODHNER, NORTHERN AND ARCTIC INVERTEBRATES. III. OPISTHOBRANCHIA ETC. 



B. Similar to T. Hombergi, but poms genitalis farther backwards and somewhat 

 below the back. Colour pale reddish brown. L. 48 mm. 



T. psoloides Aurivillius 1887. 

 II. Velum with fingered processes (subg. Candiella Gray 1857). 



A. Velum incised in the middle with 12 processes; back smooth, with 6— 7 appendages on each side: the 

 inner laterals of the radula denticulated. Colour (in alcohol) bluish gray: rhinophores yellow; foot, 

 genital orifice and mouth yellowish, L. 50 mm. T. ingolfiana Bergh 1899. 



B. Velum not incised, with 6 — 8 fingered processes: back slightly warty, with 

 5 — 6 appendages on each side ; teeth of the radula smooth. Colour yellowish 

 brown, sides lighter, marbled with brown; foot white. L. 17 mm. 



T. plebeia Johnston 1838. 



PI. Ill fig. 5. 



C. Velum not incised, with 4 filaments: hack slightly warty, with 5 appendages on each side. Colour 

 white, the back with a longitudinal opaque white line on euch side. L. 15 mm. 



T. lineata Aldeb & Hancock 1848. 



Fam. Atthilidae. 



Atthila Bergh 1899. 



Velum smooth at the margin: rhinophores retractile, the vagina bilobed above, the club lamelliform; 

 anus and porus renalis lateral. Bulbus pharyngeus important. Penis inermis. Colour (in alcohol) pale reddish. 

 L. 32 mm. A. ingolfiana Bergh 1899. 



Fam. Goniaeolididae- n. fam. 



Ooniaeolis M. Sars 1861. 



Rhinophores > the oral tentacles; foot broad, rounded in front. 



I. Body whitout cutaneous lobes: rhinophores smooth: laterals of the radula smooth. Colour yellowish with 

 a rosy median band at the sole. L. 12 mm. (G. (>. Sars 1872) C typica M. Sars 1861. 



II. Body with a cutaneous lobe in the anterior right angle of the back, and with a 



larger one behind the middle; rhinophores granulate; laterals of the radula finely 



denticulated. Colour yellowish white (in alcohol). L. 16 mm. G. lobata n. sp. 



PI. 1 figs. 10— 13: text-fig. 1. 



Fam. Dendronotidae. 



I. Vaginae of the rhinophores with simple digitiform processes: anterior head-margin with slightly ramose or 

 simple papillae; papillae dorsales a little ramified Campaspe Bergh. 



II. Vagina? of the rhinophores and the head with ramose processes; papillae dorsales 



highly branched Dendronotus Alder & Hancock. 



Campaspe Bergh 1863. 



[. Dorsal papillae 4 on each side; radula (4 — 5). 1.(4 — 5), lam. lat. with 3 — 5 denticles, lam. med. with 10 

 ones on each side. Colour whitish, the intestines translucent. L. 3.8 mm. C. pusilla Bergh 1863. 



H. Dorsal papillae 6 on each side: radula 9.1.9, lam. lat. with 5 — 17 denticles, lam. med. with 12 — 30 ones 

 on each side. Colour white with reddish brown spots, or dirty brown, white-spotted on the sides. L. 12 — 25 mm. 



C. major Bergh 188(5. 



