86 Transactions of the South African Philosophical Society. 



The central nervous system yellowish red ; the cerebro-pleural 

 ganglia roundish, a little larger than the rounded pedal ganglia ; 

 the cerebro- and pleuro-pedal connectives short ; the double chief 

 commissure rather wide. The optic nerve long, the eye of OH mm. 

 diameter; the otocyst measuring about 010 in diameter. 



The bulbtis pharyngcus whitish, only the palate and the pharynx 

 being black ; the length was 10 by a breadth of 7 and a height 

 of 6 mm The bright yellow mandibles 10 mm. long, together 

 measuring in breadth 6 mm., and one only 3 mm. ; the form 

 about as in the other species, but the hinge a little larger, about 

 2-25 mm. long ; the masticatory edge a little broader, with 5 rows of 

 projecting denticles of a height up to 010 mm. The tongue whitish 

 with yellow rasp, which behind at the tectum radulse had a breadth 

 of G mm. ; the rasp contained 26 series of teeth, the sheath 13, the 

 total number being thus 39 ; the rows had, on each side of the 

 median plate up to 60 lateral. The plates were yellow ; the 

 breadth of the median was 025 mm., the length of the first lateral 

 0-18, the height of the lateral rising to 0-30 mm. The median plates 

 (fig. 2) resembling those of the former species, but with the hook 

 always rounded ; the lateral plates (fig. 16, 3) as above. 



The long, white, rather thin salivary glands as usual. The 

 stomach-like oesophagus 8 mm. long by a diameter of 5, whitish 

 and contrasting with the black pharynx; the intestine making a 

 large arch, 13 mm. long. The contents of the digestive tract were 

 a red mass of sponge, full of red spicules of a length up to 9 mm. 



The posterior visceral mass, 16 mm. long by a diameter of 8, 

 pointed behind, obliquely truncate before, with a large excavation 

 for the oesophagus and anterior genital mass. The liver brownish 

 gray, but nearly quite covered by the thick yellowish layer of the 

 large lobes of the hermaphrodite gland. 



In the lobules of the hermaphrodite gland ripe genital elements. 

 The anterior genital mass triangular-rounded of a diameter of 7 mm., 

 white, the ampulla of the hermaphrodite duct grayish ; the coils of 

 the sperm duct measured when stretched out 2 cm. ; the seminal 

 vesicle globular, of a diameter of 2 mm. 



The nature of the frontal veil and of the gills, the colour of 

 the palate and pharynx and the form of the median tooth-plates 

 seem to justify the establishment of a new species. 



TRITONIDOXA, Hgh. nov. gen. 

 Forma corporis ut in Tritoniis, ita quoque velum frontale mar- 

 gine breve-digitato tentaculis cochleariformibus sicut rhinophoria. 

 Notaaim lu've limbo sat sato, sine branchiis. 



