76 Transactions of the South African Philosophical Society. 



the head disc with the tentacles 3 and 2 cm. by a height of 1 

 and 0'5. 



The ground colour of the back seemed to be grayish white, but 

 the tubercles and cones whiter with mostly crimson top ; the margin 

 of the rhinophore sheaths crimson, the club of these organs reddish 

 with crimson tip ; the larger marginal and (2) posterior papillae, as 

 well as some of the smaller, crimson coloured, sometimes with 

 yellowish tip ; the rhachides of the gill-leaves and their ends of the 

 same colour ; the margin of the anal papilla crimson. The whole of 

 the under side of the body grayish white ; but the sides of the body 

 (foot) as well as the tail showed here and there the tips of the 

 tubercles crimson coloured. The consistence of the animal some- 

 what coriaceous, but still rather soft. 



The posterior part somewhat convex, covered all over with rather 

 closely set, soft papillae or tubercles of roundish form and very 

 different size, reaching a diameter of 4 mm. and sometimes of the 

 same height, they very often rise in a central (contractile) pointed 

 cone (fig. 1) ; the sides of the body (foot) and the tail are covered 

 with similar tubercles, but the cones are less pronounced. The 

 anterior convex margin of the back with about 12 whitish, unequal, 

 somewhat branched and papillated appendages, between which 

 there are here and there small cones ; this row ends on either side 

 with a somewhat larger papilla of crimson colour ; the under side 

 of this frontal brim even. The lateral brim of the back bears at 

 irregular intervals 5 larger conical appendages covered all over with 

 small papillae ; behind the gill, at the end of the back proper, two 

 similar appendages. The brim of the rhinophore-sheath carries a 

 row of small papillated appendages ; the strong club with about 

 30 thin lamellae on either side. The diameter of the whole some- 

 what flattened gill was greater than that of the back ; every one of 

 the (5) gill trees consisting of (4-) 5 diverging tripinnate or quadri- 

 pinnate leaves. In the middle of the interbranchial area the truncate 

 anal papilla (standing about at the limit of the second and last third 

 of the back), and at its base to the right the renal pore. The head 

 disc rather broad, somewhat semilunar ; the mouth perpendicular ; 

 the free auricular parts of the tentacles short. In front at the base 

 of the marginal brim of the back the genital papilla. The foot 

 large, with a marginal transverse furrow in front, the border every- 

 where with small arborescent appendices. 



The walls of the cavity of the body very thick. 



The central nervous system of a breadth of 4-5 mm., whitish, 

 wrapt up in a covering of closely attached connective tissue ; the 

 different ganglia could not easily be separated; the nerve-cells of a 



