. The elasmobranch fishes . Fig. 86. Pelvic fin and girdle of male. A. Heterodontus francisci. B. Bhinobatis prodvctus. (Chester Stock, orig.) j3, beta cartilage; 6.^"", intermediate segments; ia., basal or axial cartilage; , basip- terygium; and mg. (fig. 85), dorsal marginal; }-", first and second dorsal termi- nal cartilages; pi., pelvic cartilage; ra. (fig. 85), radials; spn., spine; tr.^, accessory termi- nal; , ventral terminal. Near the union of the coracoid and scapular pieces, but on the coracoid, is the articular process. This area of articulation i

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. The elasmobranch fishes . Fig. 86. Pelvic fin and girdle of male. A. Heterodontus francisci. B. Bhinobatis prodvctus. (Chester Stock, orig.) j3, beta cartilage; 6.^"", intermediate segments; ia., basal or axial cartilage; , basip- terygium; and mg. (fig. 85), dorsal marginal; }-", first and second dorsal termi- nal cartilages; pi., pelvic cartilage; ra. (fig. 85), radials; spn., spine; tr.^, accessory termi- nal; , ventral terminal. Near the union of the coracoid and scapular pieces, but on the coracoid, is the articular process. This area of articulation in the sharks is directed verti- cally or obliquely and consequently is usually composed of two convex sur- faces {Squatina). The surface in the rays differs from that in the sharks in that it is longitudinal in position and much greater in extent. Torpedo (fig. 84b) has a type of articulation intermediate between sharks and rays.

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