The Opisthobranchiata of South Africa. 97 



the lip covered all over with small papillae. Behind the middle of 

 the length of the cowl the rhinophores, from the bottom of the 

 chalices (with undulated margin), rise the beautiful strong club with 

 about 12 lamellae and terminal papilla. The even back with minimal 

 nodules as the cowl ; on its rounded margin in these individuals 

 8 epinotidia (papillae) on each side, 4 large, 1 of middle size, and 

 3 small. These organs (fig. 2) were a little compressed, narrower 

 at the root, pointed towards the end, pronounced nodulous ; they 

 adhered rather firmly to their base.* The anal aperture before the 

 second (right) organ more inwards. The sides of the body even as 

 the back. The narrow foot projected 2 mm. beneath the cowl, of 

 almost the same breadth throughout the whole of its length, the 

 tapering tail rather short. 



The intestines were nowhere to be seen from without, which was, 

 however, the case with thin muscular fibres running along the 

 whole length of the sides of the body. The cavity of the body 

 reaching to the region of the last of the larger papillae. 



The central nervous system as in other species examined 

 (M. capucina). 



The outer mouth (already mentioned) leading in the (about 1 mm.) 

 long mouth tube (fig. 3a), on the inside, covered with small cones 

 (fig. 4), of the same kind as on the outer lips. Both the buccal 

 tube and the bulbus pharyngeus are wrapt in a rather closely 

 adhering connective tissue. The length of the bulbus pharyngeus 

 1*5 mm. by a breadth of 2, on its hinder end and beneath a little 

 prominence ; through the walls the outlines of the mandibles were 

 very distinctly visible (fig. 3b). The cavity of the mouth with 

 longitudinal folds, but no trace of lingual prominence. The clear- 

 yellow mandibles (fig. 5) resembling those of p. ex. the Tritoniae 

 or Pleurophyllidiae ; also partly covered by a muscular disc, about 

 0*65 mm. broad, with a strong connective region and a very plump 

 denticulated masticatory edge, the 10-12 denticles reaching a height 

 fig. 5) up to 0*08 mm.f 



The white salivary glands small, uneven. 



The oesophagus (figs. 6a, la) 6 mm. long, with rather strong 

 longitudinal folds. The stomach (figs. 6b, lb) of a diameter of 

 3 mm., roundish ; through its anterior part shone indistinctly longi- 



* The figure of Rang represents 7 pairs of papillae, the two hinder small. 



The smaller papillae were often set not in pairs, but unpaired in the middle 

 line. The smaller individuals had often only 5 papillae, of which the 3 larger, 2 

 paired or unpaired. 



f The bulbus pharyngeus with its mandibles agrees very likely in the other 

 species of Melibe in general with that of the typical species. Cf. I.e., taf. xlviii., 

 figs. 10-12. 



7 



