PLATE XLVIIL 
Figs. 1-4. Culeolus willemcesi, n. sp. 
Figs. 5-11. Baihyoncus discoideus, n. sp. 
br.f. Longitudinal fold in branchial sac. 
i. 1. Internal longitudinal bar of bran- I sp. Spicule. 
chial sac. | ^r. Transverse vessel of branchial sac. 
Fig. 1. Culeolus willemcesi ; natural size. 
Fig. 2. Part of the branchial sac of Culeolus willemoesi; magnified (S., 1 inch). 
Fig. 3. Branchial aperture of ; enlarged. 
Fig. 4. One of the tentacles of Culeolus willemcesi; magnified (S., 1 inch). 
Fig. 5. Bathyoncus discoideus; natural size. 
Fig. 6. Part of the mantle of Bathyoncus discoideus ; magnified (S., 1 inch). 
Fig. 7. One of the tentacles of Bathyoncus discoideus; magnified (S., 1 inch). 
Fig. 8. Part of the branchial sac of Bathyoncus discoideus; magnified (S., 1 inch). 
Fig. 9. One of the large folds from the branchial sac of Bathyoncus discoideus ; mag- 
nified (S., 1 inch). 
Fig. 10. Part of one of the internal longitudinal bars from the branchial sac of Bathy- 
oncus discoideus, showing the spicules, &c.; highly magnified (S., inch). 
Fig. 11. One of the groups of reproductive organs of Bathyoncus discoideus, dissected 
off from the mantle ; enlarged. 
