. The Bashford Dean memorial volume :. Fishes; Sharks; Fishes, Fossil. „, cb^A / care ^^^^^^ ' J^ ^^^s Text-figure 64. Skull and visceral arches of Chlamydoselachus with the deep muscles of the branchiocranium. These muscles fall into two main groups: extensors of the oral and branchial arches, running anteroposte- riorly; and flexors, running vertically. , musculi adductoresarcuales 1-6. , musculiadductores dorsales 1-5; , musculus adductor mandibulae; care, musculus coracoarcualis; cb., musculi coracobranchiales 1-6; , coracoscapular ar
. The Bashford Dean memorial volume :. Fishes; Sharks; Fishes, Fossil. „, cb^A / care ^^^^^^ ' J^ ^^^s Text-figure 64. Skull and visceral arches of Chlamydoselachus with the deep muscles of the branchiocranium. These muscles fall into two main groups: extensors of the oral and branchial arches, running anteroposte- riorly; and flexors, running vertically. , musculi adductoresarcuales 1-6. , musculiadductores dorsales 1-5; , musculus adductor mandibulae; care, musculus coracoarcualis; cb., musculi coracobranchiales 1-6; , coracoscapular arch; hyom., hyomandibular; id., musculi interdorsales 1-5; , interarcualis between hyal and first branchial arch; , labial cartilages; , musculus levator labii supcrioris; , musculus levator maxillae superioris; , palatoquadrate; , musculus protractor anguli oris; trpz., musculus trapezius. After Gregory, 1933, Fig. 4. As one would expect from the similarity of their cartilaginous branchial frame- works, there is a marked likeness between the hypobranchial musculatures of Chlamy^ doselachus and Heptanchus. Only a few points call for special consideration here. There are, to be sure, only six pairs of coracobranchiales in Chlamydoselachus, as compared with seven in Heptanchus, but this difference is correlated with the number of gill arches. Of these muscles in Chlamydoselachus, Allis (1923) says: "The more posterior coracobranchiales have no connection whatever with the musculi coraco- arcuales, Chlamydoselachus differing markedly in this respect from Heptanchus (Vetter, 1874) and closely resembling Acanthias (Vetter, )." In Vetter's figure of Heptanchus (his Fig. 9, pi. XV), the coracobranchiales of the region under consideration appear to arise directly from the muscuH coracoarcuales, while one gets a somewhat different impression from Davidson's figure reproduced as my Text-figure 63. Davidson (1918, p. 1
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