The elasmobranch fishes . elasmobranchfish03dani Year: 1934 244 THE ELASMOBRANCH FISHES from a ganglion located on the nerve in or just outside the glossopharyngeal canal (see fig. 220). The main divisions of the nerve are a branch {, fig. 220) to the anterior segment of the lateral line canal, and nerves in relation to the first and second demibranchs. The supratemporalis () in Squalus acanthias, according to Norris and Hughes, supplies three neuromasts of the lateral line canal located between the neuromasts supplied by the supratemporalis of the vagus and the ramus oticus VII, bu
The elasmobranch fishes . elasmobranchfish03dani Year: 1934 244 THE ELASMOBRANCH FISHES from a ganglion located on the nerve in or just outside the glossopharyngeal canal (see fig. 220). The main divisions of the nerve are a branch {, fig. 220) to the anterior segment of the lateral line canal, and nerves in relation to the first and second demibranchs. The supratemporalis () in Squalus acanthias, according to Norris and Hughes, supplies three neuromasts of the lateral line canal located between the neuromasts supplied by the supratemporalis of the vagus and the ramus oticus VII, but it is not provided with other branches to pit organs. In Chlamy- doselachus, Ilawkes (1906) mentioned, in addition to the twigs to the neuro- A B Fig. 222. Brachial and cervical plexuses. A. Scyllium. B. Squatina. (From Max Fiirbringer.) , brachial plexus; , cervical plexus; , dorsal root; 0., occipitospinal nerve. masts of the lateral line canal, other twigs to the skin. These she suggested were cutaneous. They possibly supply pit organs. In Raja radiata according to Norris and Hughes there are no lateral line elements in the ninth nerve. Above the first branchial pocket, as in Heptanchus, the main part of the ninth nerve, as the first branchial nerve, separates into three divisions, a pre- trematicus {), a post-trematicus (), and from the pretrematicus a pharyngeal division (), the last-named branch being sensory and com- parable to the palatine division of the facial nerve. The pretrematicus is also sensory; it extends do^\^l the hyoidean demibranch back of the branchial carti- lages, supplying the mucous membrane and gill filaments. Unlike Heptanchus the majority of Elasmobranchs seem to lack the internal pretrematicus. The post-trematicus or larger division, unlike that of Heptanchus, is not always so clearl}^ separated into its components. The post-trematicus supplies the mu- cous lining along the anterior part of the first holobranch and
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