ELIOT : NODIBRANCHS OF FALKLAND ISLANDS. 353 



The yellow membranous jaws bear a row of large irregular denticles. 

 The tips are generally square and blunt, but sometimes split or 

 fringed. 



From a series of sections made it appears that there is a chitinous 

 armature on the penis, but whether it is a spine or a tube could not 

 be determined. 



This species seems intermediate between Amphorina and Cratena. 

 It has ovate cerata and a style or tube on the penis, features which 

 ally it to Amphorina, but on the other hand the radula is not, as usual 

 in that genus, long and tapering. It may perhaps be referred to 

 Cratena. It does not seem to be Cr. Cavancm or Cr. pusilla recorded 

 from Chile. 



Galvina Falklandica, n.sp. PI. XXVIII, Fig. 6. 



Three specimens and also some spawn consisting of small white 

 coils attached to hydroids. The coils are short and stout, semicircular 

 or imperfectly circular, but never more complicated. 



The animals are elongate, the largest 8 mm. long and 2 broad. The 

 height is 2-75 to the tip of the pericardium, and the foot extends 

 2 mm. behind the last cerata. The first is white and the integuments 

 colourless, but the whole animal appears yellow or fawn-coloured, 

 owing to the hepatic diverticula and hermaphrodite gland showing 

 through. 



The foot is rounded in front, without lateral projections, and 

 apparently connected with the head. The rhinophores (3 mm.) are 

 much longer than the oral tentacles (about 1 mm.), wrinkled, but 

 not really perfoliate. Behind them are visible two black eyes. The 

 cerata are long (2-75-3 mm.), and longer in the smaller than in the 

 larger specimens. They are rather stout, but hardly ovate, very 

 erect, and somewhat as in Trinchese's figure of Gahina flava 

 (^olididas del Porto di Geneva, vol. ii, pi. xxix, figs. 2-3). The 

 plan of arrangement is not plain, but they are apparently set in about 

 6 groups, each containing 4 cerata as a maximum. The anus is 

 lateral and rather far forward. 



The jaws bear a single row of coarse denticles. In two specimens 

 dissected the radula was found to consist of forty rows, tapering 

 considerably, and each containing three teeth. The median tooth 

 (Fig. 6fl) bears a central cusp with four denticles on either side. The 

 central cusp is much depressed, so that its point lies below the level of 

 the lateral denticles, with the result that from certain points of view 

 the tooth appears to be bilobcd with no central cusp at all. It can, 

 however, be found by focussing in all the rows. The side teeth 

 (Fig. 6J) are of the shape usual in the genus, but rather thin and 

 tall. Their outline is curved, not rectangular. 



The dentition of this species is not unlike that of G. flava, 

 G. viridula, and G. rupium, and it is possible that it may be 

 identical with the first of these, but until further information about 

 the living animal is forthcoming I think it safer to register it as 

 a separate species. 



