PLATE VII 



NERVOUS SYSTEM AND CERTAIN SENSE ORGANS OF HEPTAHCHUS 

 AND CHLAMTDOSELACHUS 



Fig. 28. Brain, cranial nerves and associated sense organs of Heptanchus macuJatus, dorsal view. 



bu.VII, buccal branch of facial nerve; cb., cerebellum; cl., ciliary nerve; c.r., restiform body; hmd., hyomandibular 

 division of the facial nerve; wid. V, mandibular division of the fifth nerve; m.n., median olfactory nucleus; med., medulla; 

 mx.V, maxillary division of trigeminal nerve; ol.h., olfactory bulb; ol.I., olfactory lobe; oi.t., olfactory tract; op.l., 

 optic lobe; op.V, ophthalmicus profundus division of the trigeminal nerve; os.V and VII, ophthalmicus superficialis 

 of trigeminal and facial nerves; t!., telencephalon; tn., terminal nerve; y-z, occipitospinal nerves: I, olfactory nerve; U, 

 optic; III, oculomotor; IV, trochlearis; VI, abducens; VIII, auditory; IX, glossopharyngeal; X, vagus. 



After Daniel, 1934, Fig. 200a. 



Fig. 29. Diagrammatic drawing of the cranial nerves and lateral line canals of ChJamyiioselachus. 



B.A., buccal ampullae; Bucc, ramus buccalis VII; C.F., general cutaneous fibres going to skin; Con. V5, nerve strand 

 connecting the pre- and post-trematic rami of vagus 5; Con. V6, nerve strand connecting vagus 6 with a spinal nerve; 

 D.G., dorsal branch of the glossopharyngeus, dividing into a cephalad branch which passes to the neuromasts, and 

 a caudal branch whose distribution is undetermined; E.M. ( VII)(A,B,C,D,E), the five parts of the externus mandibularis 

 VII; H., the ganglion of the truncus hyomandibularis, i.e., the true ganglion of the facialis, combined with one of the 

 acustico-lateralis ganglia; H.A., hyoid ampullae; If.L.(A,B,C), the hyomandibular lateral line canal and its three main 

 branches; H.M , the common trunk of the ramus hyoideus and ramus internus mandibularis VII; I.(A,B,C), the three 

 principal rami intestinales; I.H., the cardiac branch of the ramus intestinalis; I.M.VII, ramus internus mandibularis 

 VII; I.O.L., infraorbital lateral line canal; L.L., main lateral line canal; Mxb., branch of the maxillaris which becomes 

 united with a branch of the buccalis; Mxb.b., two fine nerves which appear to originate from a branch of the buccalis, 

 but which are composed of general cutaneous fibers which have come from Mxb.; P., palatine branches of the facialis; 

 P.B.A., posterobuccal ampullae; Pr.F.(ch.), the chorda tympani; Pr. and Pt., the pre- and post-trematic rami of IX and 

 of the vagus; Pro., profundus branch of V; Pt.F., post-trematic facialis; R.H., ramus hyoideus VII; R.Man. V, ramus 

 mandibularis V; R.Max., ramus maxillaris V; R.O., ramus oticus with cutaneous branches R.O.C.; 5.(1,2,3,4,5,6,7,8), 

 the first eight spinal nerves; s.h.(l,2), the two branches which make up the hypoglossal nerve; S.O., occipitospinal 

 riband; S.O.A., supraorbital ampullae; S.O.L., supraorbital lateral line canal; S.Op.V, superficialis ophthalmicus V; 

 S.Op.Wll, superficialis ophthalmicus VII; T.H., truncus hyomandibularis; V(l,2,3,4,5,6), the six branchial branches 

 of the vagus; V.G., visceralis branch of IX; Vis., visceralis branches of the vagus; V, Vll, the united Gasserian and 

 buccalis gangUa; IX, IXg., the glossopharyngeal nerve and its ganglion; X, Xg., the vagus nerve and its composite 

 ganglion; X.A and X.B, dorsal branches of the vagus to neuromasts. The remaining abbreviations are not explained 

 by the author. 



After Hawkes, 1906, Fig. 1, pi. LXVIII (in color). 



Fig. 30. Right membranous labyrinth (x 2) of Chlamydoselachus, medial aspect. 



The explanation of the labels is combined with that for the next figure. 

 After Goodey, 1910.1, Fig. 7, pi. XLIII. 



Fig. 31. Right membranous labyrinth (x 2) of Chlamydoselachus, lateral aspect. 



a.a., ampulla anterior; a.d.e., apertura ductus endolymphaticus externus; a.e., ampulla externus; a.p., ampulla posterior; 

 CO., canalis anterior; c.e., canalis externus; c.p., canalis posterior; d.e., ductus endolymphaticus; d.u.s.p., ductus 

 utriculo-saccularis posterior; !., lagena; p.f-, parietal fossa; r.a.d., ramus of eighth nerve to ampulla of anterior canal; 

 r.fl.e., ramus to ampulla externus; r.a.p., ramus to ampulla posterior; rec, recessus utricuU; r.l., ramus to lagena; r.n., 

 ramus to macula neglecta; r.s., ramus to sacculus; r.u., ramus to utriculus; s., sacculus; s.e., saccus endolymphaticus; 

 t., tympanic aperture; u.a., utriculus anterior; u. p., utriculus posterior; VIII, eighth cranial nerve. 



After Goodey, 1910.1, Fig. 8, pi. XLIII, 



