. The Bashford Dean memorial volume :. Fishes; Sharks; Fishes, Fossil. A-. {t-Fto. ,vm jj \^\ B- Manyy ; ^^ucc Text-figure 119. Gangliated roots of fifth, seventh and eighth cranial ner\'es of Chlamy- doselachus: A, lateral view; B, medial (inner) view. Bucc., ramus buccalis VU; H., gangUon of the trvmcus hyomandibularis (, the true ganglion of the facialis, combined with the acustico-hteraHs ganglion); Man. V and Max. V, mandibular and maxillary divisions of the facial ner%'e; , pars intermedia; Fro., profundus branch of the facial; R-C, ramus communicans; R_
. The Bashford Dean memorial volume :. Fishes; Sharks; Fishes, Fossil. A-. {t-Fto. ,vm jj \^\ B- Manyy ; ^^ucc Text-figure 119. Gangliated roots of fifth, seventh and eighth cranial ner\'es of Chlamy- doselachus: A, lateral view; B, medial (inner) view. Bucc., ramus buccalis VU; H., gangUon of the trvmcus hyomandibularis (, the true ganglion of the facialis, combined with the acustico-hteraHs ganglion); Man. V and Max. V, mandibular and maxillary divisions of the facial ner%'e; , pars intermedia; Fro., profundus branch of the facial; R-C, ramus communicans; R_ V., root of trigeminal nerve; and , superficial ophthalmic divisions of the fifth and seventh cranial nerves. After Hawkes, 1906, Figs. 2 and 3, pL LXVm. preorbital foramen and reaches the dor^ surface of the nasal capsule, where it immediately breaks up into numerous branches which spread out, fan-shaped, and innen.'ate the sensory organs of the supraorbital laterosensory canal and the supraorbital ampullae, as shown in the figures. As the ner\'e traverses the orbit a number of branches are sent upward through the foramina supraorbitaHa to the related portion of the supraorbital canal. The maxiUar}' and the mandibular rami of the trigeminal nen.'e (Max. V. and Man. V. in Text-figure 119) come off separately from the Gasserian gangHon; there is no common maxillo-mandibular trunk. This condition is somewhat exceptional ainong elasmobranchs. Since, in Chlamydoselachus, the angle of the jaw is situated far posteriorly, the mandibular nerve leaves the maxillary early in its course and passes over the posterior wall of the orbit to reach the angle oi the mouth, as m Acanthias. The mandibular nerve does not supply the large median transverse muscle bridging the halves of the lower jaw in the gular region (Fiirbringer, 1903; Hawkes, 1906; Luther, 1909; AlHs, 1917 and 1923). This unique feature has been fully discussed (p. 399) in the section on the muscular Ple
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