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Show 890 ON COLOUR-VARIATION IN FLAT-FISHES. [Dec. 17, Sp.o. II. III. IV. V. r.b. V. com. V. com.1 V. r.mn. V. r.mx. V. r.mx.i. V. r.mx.s. Supra-orbital branch of the main sensory canal. Optic foramen. Oculo-motor nerve. Pathetic nerve. Ramus buccalis.-Trigeminal. Commissure between the facial and trigeminal nerve. Commissure between the ramus ophthalmicus superficialis and the ramus buccalis. Ramus mandibularis.- Trigeminal. Ramus maxillaris.-Trigeminal. Ramus maxillaris inferior. -Trigeminal. Ramus maxillaris superior. --Trigeminal. V. r.o.p. V. r.o.s. VI. VII. VII. r.hy. VII. r.mn. VII. r.p. VIII. IX. X. X. r.br. 3. X. r.int. X. r.lat.s.i. X. r.mot. X. r.v.lat. Ramus ophthalmicus profundus.- Trigeminal. Ramus * ophthalmicus superficialis.- Trigeminal. Abducent nerve. Facial nerve. Ramus hyoideus.-Facial. Ramus mandibularis.- Facial. Ramus palatinus.- Facial. Auditory nerve. Glossopharyngeal nerve. Vagus. Branchial nerve. Ramus intestinalis. Ramus lateralis superficialis inferior. Motor branches from Vagus ganglion. Ramus vagi lateralis. The branch x arising Fig. 1. Lateral view of the head of Chimcera, showing the distribution of the sensory and ampullary canal-system. 2. Portion of the canal-system showing variation. from the main canal of the head. 3. Anterior view of the head of Chimcera, showing the connection of the supra- and sub-orbital branches, and the Y"shaped commissure connecting the same with the maxillo-mandibular branch. 4. Diagrammatic view of the dorsal surface of tbe head of Chimcera, showing the main canal and branches, and the occipital commissure. 5. Transverse section through the lateral canal, c. Cavity, n.f. Nerve-fibre. 6. Cartilaginous hoops from the sub-orbital branch of the main sensory canal. 7. Diagrammatic view of the distribution of the cranial nerves. 8. Lateral view of the posterior portion of the cranium of Chimcera, showing tbe foramina for the exit of the cranial nerves. 9. Ampullary canals from the head of Chimcera:-a, from the occipital group; 6, from the sub-orbital group ; c, from the maxillary group. amp. Ampulla, c. Canal, n.f. Nerve-fibre, p. Pore. 10. Sensory organ from the base of an ampullary canal in Chimcera. 11. The same from an ampullary canal in Scyllium. cp. Cupola. ep. Epithelium. n.f. Nerve-fibre. 3. Note in Correction of a Paper on Colour-variation in Flat-fishes. By W . BATESON, M.A., F.R.S., Fellow of St. John's College, Cambridge. [Received December 11, 1895.] In the ' Proceedings' of this Society, 1894, p. 246,1 published account of an abnormal Brill (Rhombus Icevis) having a series of dark spots along the dorsal and ventral borders of the body on the " blind " side. In commenting on this case, stress was laid on the fact that the corresponding parts of the dorsal and ventral borders had thus varied similarly and simultaneously. At the time I was |