38 Marine Investigations in South Africa. Vol. V. 



Quite in front a small, perfectly transparent, colourless shell, 

 2*5 mm. long, and without any trace of calcification, was seen 

 (fig. 10). 



The form was as usual ; the tentacles small ; the back smooth 

 with brim broad ; the gill with two very pronounced series of nodules 

 (vesicles) ; in front of the gill a small prffibranchial tube. The 

 genital apertures without protecting folds. The foot well developed, 

 the tail projecting behind the body proper. 



The central nervous system quite as in other Oscaniellae. The 

 ganglion opticum distinct with a short N. opticus, the diam. of the 

 large eyes 0'30 mm. ; in the skin of the back, as is usual in the 

 Oscaniellae, there were peculiar filaments (fig. 11) of different 

 length and bent in the most different way, often serpentine ; their 

 diameter 0-0035-0-005. 



The length of the buccal tube 3 mm. ; that of the bnlbus 

 pharyngeus 4-5 mm. by a breadth of 5 and a height of 3-5 ; of 

 the usual form, the rasp-sheath a little projecting behind. The 

 yellowish mandibles quite as usual, as also their rather clumsy 

 elements (figs. 12-14), whose length rose to 0-22 by a breadth of 

 0'14 and a height of 0-08 mm. ; on each side of the somewhat 

 pointed hook 2-4 short denticles. The tongue as usual ; in the 

 yellowish rasp about 25 series of plates, in the sheath 20, the total 

 number of rows being thus 45 ; in the series up to about 120 plates. 

 The plates (figs. 15-18) were yellowish ; the height of the inner- 

 most 0-035 mm., rising to 0-12, further on up to 0-18, then decreasing, 

 the tenth from the outer margin of the rasp measuring 0-08, the 

 outermost 0-035 mm. The plates of the inner half of the series 

 hook-formed (figs. 15, 16), those of the outer erect with shorter 

 base (figs. 17, 18) ; the teeth had no trace of denticles. 



The stomachs as in other Oscaniellae. The liver yellowish brown. 



This form seems different from the other hitherto known species. 



OSCANIELLA NIGROPUNCTATA, B. Var. ? 



PI. IV., figs. 22-26. 



Ofi" Cape St. Blaize (N. 42, E. 11 miles) a single individual was 

 taken by shrimp-trawl. 



It was very badly preserved, the colour mostly rubbed ofi' and 

 replaced by a dirty gray. The back all over had been covered by 

 rather closely placed small polyangular scarcely prominent disks 

 of a diameter of 2-3 mm., now grayish brown with a whitish centre 

 (sometimes like a papula) ; somewhat smaller disks of the same kind 



