NUDIBRANCHS FROM THE COAST OV NATAL. 22-3 



tare is not much developed. It consists of two small hatchet- 

 shaped plates composed of greyish rods. The formula of the 

 radula is 21 x 25 . . 25. The teeth are hamate^ not denti- 

 culate, and rather large. The two to three outermost teeth 

 are erect and thin. 



This is an immature Discodoris, perhaps D. cdbru- 

 lescens. 



Thordisa burn u pi n. sp. 



The notes on the living animal are as follows: "No 

 measurements taken. Dorsal surface orange, closely sprinkled 

 with lighter orange or yellow spots and with a light area 

 between the tentacles (i.e. rhinophores) and around the 

 branchial pocket. The Avhole dorsal surface except these areas 

 plentifully covered Avith black-pointed bristles.^ Tentacles 

 (i.e. rhinophores) white, with a branched reddish-brown 

 line on the inner side of each. Foot yellow with black spots 

 round the upper side of it.^' 



The preserved specimen is 15*5 mm. long and 8 mm. broad. 

 It is coloured much as described, but the large rhinophores 

 appear to be entirely black. On a closer examination it is 

 seen that the perfoliations are black but divided by a fine 

 longitudinal white line both in front and behind. The pockets 

 of the rhinophores and branchias are slightly raised and 

 round. The branchiae ai'e five, not large, greyish and veined 

 with black. The whole dorsal surface is villous, as if it were 

 covered with short wavy hair. The foot is grooved and 

 notched, the upper lamina being developed into rather large 

 lappets. The oral tentacles are white, thin and finger- 

 shaped. 



There is no trace of a labial armature. The radula consists 

 of twenty rows, which in the widest part have a formula of 

 3 + 17 . . 17 + 3. The teeth near the rhachis are of the 

 ordinary hamate shape and rather large, but towards the end 



' The preserved specimen suggests that this phrase is not quite 

 correct. Only some of the bristles are black ; most are yellow. 



