NORWEGIAN OPISTHOBRANCHIATE MOLLUSCA 



Fig. 1 1 . C distans n. sp. (cf. p. 47). 



each other, containing 4 papillae each; then, 2 more distant rows 

 with 3—4 papillae each, and. behind them, 2 — 3 denser rows of 

 3 — 1 papillae. Anus latero-dorsal, pOst-median, in front of the 

 root of the inner papilla 

 of the 4th row. Penis 

 unarmed, with a hook- 

 formed glans, immediately 

 in front of the female 

 aperture, and beneath the 

 space between the fore- 

 most and the second row 

 of papillae. Mandibular mar- 

 gin with one row of den- 

 ticles. Radula uniseriate, 

 ^yith about 16 teeth, each 

 having a strong median 

 cusp and 6 denticles on 

 each side (fig. 12). 



This new species, the colour of which had disappeared in 

 the specimens preserved, differs from the previously known 

 species of Cuthona (including Cratena) in its latero-dorsal anus, 

 which is generally situated farther below on 

 the side of the body (m C. olivacea also in 

 front of the 4th row of papillae, cf. Alder & 

 Hancock, Monogr., pi. 7, fig. 3 ) The arrange- 

 ment of the papillae recalls C. amoena A. & H., 

 and, like this species, the present one has the 

 inner papillae considerably longer than the outer 

 FigA% C. distans ones. Also, as the radula offers discriminations 

 from the remaining forms, I do not hesitate to 

 establish a new species for the present form. 

 Cuthona olivacea Alder & Hancock. Selsøvik, 1 sp., 1. 

 5- — Eliot (1910) unites the genus Cratena Bergh, to which 

 this species is to be referred, with Cuthona, Alder & Han- 



radula tooth 

 (cf. p. 47). 



