Fishes . Fig. 129.—Bullhead-shark, Heterodontus francisci (Girard). San Pedro, Cal. Suborder Cestraciontes.—The most ancient types may be setoff as a distinct suborder under the name of Cestraciontes Fig. 130.—Lower jaw of Heterodontus phibppi. From Australia. Family Hetero- dontidcs. (After Zittel.) These forms find their nearest allies in the Noiidani, whichthey resemble to some extent in dentition and in having thepalato-quadrate articulated to the skull although fastened i88 The True Sharks farther for^vard than in the Notidani. Each of the two dorsalfins has a strong spine.

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Fishes . Fig. 129.—Bullhead-shark, Heterodontus francisci (Girard). San Pedro, Cal. Suborder Cestraciontes.—The most ancient types may be setoff as a distinct suborder under the name of Cestraciontes Fig. 130.—Lower jaw of Heterodontus phibppi. From Australia. Family Hetero- dontidcs. (After Zittel.) These forms find their nearest allies in the Noiidani, whichthey resemble to some extent in dentition and in having thepalato-quadrate articulated to the skull although fastened i88 The True Sharks farther for^vard than in the Notidani. Each of the two dorsalfins has a strong spine. Family Heterodontidae. — Among recent species this groupcontains only the family of Hcterodontidcc, the bullhead sharks,or Port Jackson sharks. In this family the head is high, withusually projecting eyebrows, the lateral teeth are pad-like,ridged or rounded, arranged in many rows, different from the 4^

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