PLATE IX 



Abyla tottoni Sears, whole animal, x 4. 'Discovery II' St. 1178 



Fig. 1. Apical view of the anterior nectophore, with the large left 

 hydroecial wing in the right background. 



Fig. 2. View showing the ventral side of the anterior nectophore and the 

 right side of the posterior nectophore. The left dorsal ridge is on 

 the right running down to the median dorsal tooth. 



Fig. 3. View showing the dorsal side of the anterior nectophore and the 

 left side of the posterior nectophore. The strong teeth on the 

 'comb' (or inturned edge of the right hydroecial wing) can be seen 

 lying under the larger left hydroecial wing. 



Fig. 4. Basal view of the animal, showing the ostium of the nectosac of 

 the posterior nectophore and its surrounding teeth. The large left 

 hydroecial wing lies on the left, and on the right the left dorsal 

 ridge can be seen joining the median dorsal tooth. The right dorsal 

 ridge lies above, and parts of the anterior nectophore are seen in 

 the background. Inset: the ostial region, showing (white pecked 

 lines) the actual junction of the left ridge, R.l, with the median 

 tooth, To.d., and its hypothetical former junction with the left 

 tooth, To.l. 



