The Opisthobranchiata of South Africa. 83 



TEITONIA, Cuv. 

 E. Bergh, System, I.e., p. 1068. 



1. Tritonia pallida, Stimpson. 



Stimpson, Descr. of some new Marine Invertebrata. Proc. of 

 the Ac. of Nat. Sc. of Philadelphia, vii., 1856, p. 388. 



Eliot, the Nudibranchiata of the Antarctic Expedition. Trans. 

 Eoy. Soc. of Edinburgh, xli., 3, 1905. p. 528, figs. 11-54 



PI. XIII., figs. 12-15 ; Taf. XIV., fig. 1. 



One specimen of this form was procured in False Bay (Buffalo 

 Bay) by shrimp-trawl. It is now very hard and stiff, not very 

 suitable for anatomical examination. 



The length of the animal is 5 cm. by a breadth of the back proper 

 of 1'5 and a height of 1*2 cm. ; the breadth of the frontal veil 11 mm., 

 the height of the rhinophore sheaths 3 mm., that of the gills 4 mm. ; 

 the breadth of the foot in front 13 mm., its brim 3, the length of the 

 tail 7 mm. The animal is now uniformly coloured white." 



The form is as usual, elongated, subquadrilateral ; the frontal veil 

 somewhat bilobed, with 4 digitations on either lobe (as also remarked 

 by Stimpson), the outermost one being the usual spoon-like tentacle ; 

 the sheaths of the rhinophores erect, tubular, with digitate margin, 

 the club as far as could be detected of the usual sword-knot form. 

 The back all over somewhat nodular, flattened ; the margin a little 

 projecting, rising in about 12-14 gills of the usual kind and some- 

 what varying size (according to Stimpson there are 16 gills and 

 between those smaller ones). The genital opening as usual; the 

 anus at about the middle of the body proper, under the sixth gill. 

 The foot with a rather long slight marginal furrow, the brim not 

 quite narrow ; the tail rather long. 



The intestines were nowhere to be seen from without. 



The whitish central nervous system as usual ; the nerve cells 

 reaching a diameter up to 0*28 mm. 



The strong bulbus pharyngeus 14 mm. long by a breadth of 8 and 

 a height of 7*5 ; its form and structure as usual. The yellow man- 

 dibles rather elongated, 14 mm. long by a breadth of 4 and a 



* The specimen captured by Stimpson in False Bay, Cape, was when alive 

 " 1 inch long, of transparent white colour with a few flake- white spots on the back 

 — the filaments around the truncated extremity of the sheaths of the tentacles of 

 a dark brownish colour ; a white line extends below and parallel to the branchiae 

 on the sides of the body." 



