788 MR FRANK J. COLE ON THE MORPHOLOGY OF THE MYXINOID FISHES. 
Fig. 5. Dissection from the dorsal surface of the nasal skeleton of a 454 cm. Hag. x4. Nasal rings 
numbered from before backwards. As only those portions of the skeleton visible in a mid-dorsal view are 
shown, the figure should be compared with fig. 1. 
Fig. 6. Reconstruction from serial sections of the skeleton of the posterior portion of the nasal tube, and’ 
of the anterior portion of the nasal capsule of a 25 cm. Hag as seen from the left side. The scale in this 
and subsequent figures refers to the enumeration of the sections—numbered consecutively from the anterior 
extremity backwards. Nasal rings numbered from before backwards. Cp. with figs. 1 and 5. x 22. 
Fig. 7. Dissection from the ventral surface of the dental skeleton of a 454 cm. Hag. x44. The parts 
have been displayed for the sake of clearness—cp. fig. 8 for the natural relations. Colours as in fig. 1. 
Fig. 8. Reconstruction from serial sections of the dental skeleton (without the teeth) of a 25 cm. Hag as 
seen from the dorsal surface. The two halves of the dental plate in transverse section form a distinct V, 
but in the figure they are represented flattened out. Otherwise the fig. is not diagrammatic. x 7. 
Fig. 9. Dissection from the dorsal surface of the teeth and dental skeleton of a 454cm. Hag. x44. The 
parts have not been displayed to such an extent as in fig. 7. Teeth numbered from before backwards. 
Colours as in fig. 1. 
Fig. 10. Dissection from the ventral surface of the basal plate of a 454 cm. Hag. x3. Colours, ete. 
as in fig. 1. 
Fig. 11. Dissection from the left side of the branchial +cesophageal duct skeleton of a 354 cm. Hag. 
x 6. Efferent gill ducts numbered from before backwards. Cartilage blue. 
Fig. 12. The corresponding cartilage, with a similar orientation, of a 35 cm, Hag, to show the absence of 
the ventro-anterior (efferent gill duct) portion of the preceding figure. x 6. 
Puate III. 
Fig. 13. Reconstruction from serial sections of a 25 cm. Hag of the branchial + cesophageal duct skeleton 
of the left side seen from the external surface. The orientation is exactly the same as in figs. 11 and 12. 
x 22. 
Fig. 14, Dissection of the same 355 cm. Hag of fig. 11 from the right side to show the branchial 
skeleton, x6. Efferent gill ducts numbered from before backwards. Cartilage blue. 
Fig. 15. Reconstruction from serial sections of a 25 cm. Hag of the branchial skeleton of the right side 
seen from the external surface. The orientation is exactly the same as in the preceding figure. x 22. 
Fig. 16. Reconstruction from serial sections of the skeleton of the pharyngeal velum of a 25 cm. Hag as 
seen from the ventral surface. The natural relations of the parts have not been disturbed, and this figure 
should therefore be compared with fig. 2, where the velar skeleton is represented displayed. There was a 
series of detached nodules of cartilage in the region of the posterior transverse velar bar (p. ¢. v. 6.) which 
have been omitted from the figure. x 15. 
Fig. 17. Dissection from the left side of the skeleton of the ‘‘ caudal fin” of a 3l em. Hag. x2. Where 
the “fin rays” are not fused with a longitudinal cartilage, z.e. as they are posteriorly, they are connected up 
by fibrous tissue (not shown in the figure). Spinal cord black. Slime sacks omitted, 
Fig. 18. Thin transverse section of the notochord and its sheath of a 34 cm. Hag taken at about the 
middle of the body. Two of the chordal cells are shown as they appear in thick sections, in which the whole 
of one wall of a cell with the opposed nucleus may be seen. In two others, the nucleus is shown in section 
embedded in a thin layer of protoplasm. Zeiss apochr. 1°5 mm., compens. oc. 4. 
