PLATE XIII. 
Bathydoris dbyssorum, Bergh. 
Fig. 1. The animal on a reduced scale, from the anterior. 
Fig. 2. The bulbus pharyngeus, from the side ; a, labial disk, with its strong retractor muscles ; 5 , b, 
muscular mass on the foreside of the mandibles ; c, end of the radula sheath ; d, end of 
the salivary gland, with its duct passing over the buccal commissure ; e, the root of the 
cesophagus, with the right buccal ganglion. 
Fig. 3. The same, from above ; a, b,b, and e, as in fig. 2. 
Fig. 4. Foreside of the mandibles, united by the thick cuticle of the buccal cavity (cf. fig. 65), after 
the removal of muscular mass, resting on their foreside ; the right mandible overlapping 
the left ; a, under end. 
Fig. 5. The right mandible, from the foreside; a, upper; 5, under end; opposite the fig. 5 is the tooth. 
Fig. 6. Perpendicular section through the length of the bulbus pharyngeus near the middle line; a, 
c, e, as in fig. 2. Behind the labial disk (a) the part of the bulbus lying in front of the 
mandible, clothed with a thick cuticle (6); d, free part of the left mandible; behind this 
the tongue, and beneath a transverse section of the musculus lingualis inferior. 
Fig. 7. Pihachidian part of a row of plates; a, median plate; 5, 5, first lateral plate; c, second ; d, 
third lateral plate. Cam. luc. x 100 diam. 
Fig. 8. Median plate, from the side. Cam. luc. x 100 diam. 
Fig. 9. Two other median plates, from the side. Cam. luc. x 100 diam. 
Fig. 10. First lateral plate, from above. Cam. luc. x 100 diam. 
Fig. 11. Irregular first lateral plate, from the side. Cam. luc. x 100 diam. 
Fig. 12. Second lateral plate, from above. Cam. luc. x 100 diam. 
Fig. 13. Fourth (a) and fifth (5) lateral plates, from above. Cam. luc. x 100 diam. 
Fig. 14. Sixth lateral plate, from above. Cam. luc. x 100 diam. 
Fig. 15. Four lateral plates, from the inner third of the radula, from above; a, irregular plate 
with short hook. Cam. luc. x 100 diam. 
Fig. 16. Two others ; a, with short hook. Cam. luc. x 100 diam. 
Fig. 17. A piece of the outer fifth of a row, with three plates, obliquely from above. Cam. luc. x 100 
diam. 
Fig. 18. A similar plate, from the side. Cam. luc. x 100 diam. 
Fig. 19. A similar plate, from the under side. Cam. luc. x 100 diam. 
Fig. 20. A quite irregular plate. Cam. luc. x 100 diam. 
Fig. 21. A double plate, from above. Cam. luc. x 100 diam. 
Fig. 22. Another, from the side. Cam. luc. x 100 diam. 
Fig. 23. A worn lateral plate from the anterior rows of the tongue. Cam. luc. x 100 diam. 
Fig. 24. A similar plate. Cam. luc. x 100 diam. 
Fig. 25. Part of the upper portion of the ureter. 
