108 Transactions of the South African 'Philosophical Society. 



brownish liver for the most part covered by the yellowish testis, 

 whose large lobes contained ripe zoosperms. The vas deferens 

 formed the usual twisted ball, and was continued forwards first in a 

 straight course ; it continued in winding through the penis, and 

 projected a little from its end (fig. 20). 



Another, a female and somewhat smaller, specimen was procured 

 off Cape Point (NE. by E. 36 miles), 660-700 fms., green mud. 



It was 3-5 cm. long by a breadth of 2-3 and a height of 2-8 cm. 

 The colour was quite as in the male individual, as were also the 

 ophthalmophores. The exserted pharyngeal bulb was (only) 

 examined. 



The bulbus pharyngeus 6 mm. long by a breadth of 5. The man- 

 dibles 3 mm. long, dirty yellowish, in the anterior part dirty 

 brownish, of about the usual form (fig. 17). The rasp of the tongue 

 more yellow than in the male specimen, containing 23 series of 

 plates ; the sheath bent upwards and forwards in the median line, 

 but not reaching so far forwards, containing 26 series, of which the 

 5 hindermost were not fully developed ; the total number of series 

 thus 49. The plates quite as in the other specimen. 



As regards the large size and the membranous condition of the 

 shell this form quite agrees with M. leptolemma of the Atlantic." 

 The colour of the under side of the mantle is, however, quite 

 different, as also the character of the lingual plates, especially that 

 of the median. This form is a new species. 



NATicnm 



SIGAEETUS, Lmk. 



SlGARETUS PLANULATUS, Eecluz. 



Sigaretus planus, Philippi. Abb. u. Beschreib., i., 1842, p. 146; 



tab. i., fig. 7. 

 Sigaretus planulatus, Eecluz. Sigaretus, Chenu, illustr. conchyl., 



1843-1845. 

 Sigaretus planus, Phil. Troschel, das Gebiss d. Schnecken, i., 



(1856-) 1863, p. 184 ; tab. xv., fig. 16. 



* R. Bergh, " Nudibranches et Marsenia," Res. scientif. , par Albert i., 

 fasc. xiv., 1899, pp. 31-36; pi. i. ; pi. ii., figs. 1-5. 



