. The elasmobranch fishes . Fig. 73. Median ventral basibranchial cartilages. A. Chlamydoselachus. (From Goodey.) B. Heterodontus francisci. 1)1)., basibranchial; hh., basihyoid; ch., ceratobranchial; , glossal process; hh., liypo- branchial; mi)., median piece. Figure 50b represents the area of rudimentary arches in Heptanchus macu- latus. It will be observed that a slight asymmetry is shown which gives a some- what greater development of the midventral region on the right than on the left side. Through this asymmetry the rudimentary arch and adjoining area on the right side are more high
. The elasmobranch fishes . Fig. 73. Median ventral basibranchial cartilages. A. Chlamydoselachus. (From Goodey.) B. Heterodontus francisci. 1)1)., basibranchial; hh., basihyoid; ch., ceratobranchial; , glossal process; hh., liypo- branchial; mi)., median piece. Figure 50b represents the area of rudimentary arches in Heptanchus macu- latus. It will be observed that a slight asymmetry is shown which gives a some- what greater development of the midventral region on the right than on the left side. Through this asymmetry the rudimentary arch and adjoining area on the right side are more highly developed than on the left. Upon examination of the ventral side of the rudimentary arch on the right side I found certain round and pointed rays (/•., fig. 50b) arising from the
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