Archive image from page 8 of Differential growth in three ichthyosaurs Differential growth in three ichthyosaurs : Ichthyosaurus communis, I. breviceps, and Stenopterygius quadriscissus (Reptilia, Ichthyosauria) differentialgrow00mcgo Year: 1973 Fig. 2 Standard measurements for the ichthyosaurs studied. A. Diagram of skull showing cranial measurements: 1 —length of premaxillary segment, 2 — length of external naris, 3 — diameter of orbit, 4 — length of prenarial segment, 5 — length of snout, 6 — length of jaw; B-B — longitudinal axis of skull, A-A — longitudinal axis of orbit, Ang — angular.
Archive image from page 8 of Differential growth in three ichthyosaurs Differential growth in three ichthyosaurs : Ichthyosaurus communis, I. breviceps, and Stenopterygius quadriscissus (Reptilia, Ichthyosauria) differentialgrow00mcgo Year: 1973 Fig. 2 Standard measurements for the ichthyosaurs studied. A. Diagram of skull showing cranial measurements: 1 —length of premaxillary segment, 2 — length of external naris, 3 — diameter of orbit, 4 — length of prenarial segment, 5 — length of snout, 6 — length of jaw; B-B — longitudinal axis of skull, A-A — longitudinal axis of orbit, Ang — angular. Dent —den- tary, Quad — quadrate, Sur — surangular. Max — maxilla. B. Diagram showing body measurements: 1—length of jaw, 2 — length of forefin, 3 — width of forefin, 4 — length of body (without the skull). c. Diagram showing characters measured in investigating growth of the tail: P — precaudal body length, b — base length of the triangle formed between tips of the tail fin and the peduncle, h — height of the triangle, measured at right angles to the base, 6 — angle of tail bend.
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