. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. i82 Bulletin So. Calif. Academy Sciences / To/, (i^. Pt. 4, 1^64. Figure 1—Imprint of hums tail from the Miocene Valmonte Diatomite at Wal- teria. There is no indication of a cutwater. The Cetorhinidae lack the deep lateral incisions on the vertebrae (). Within the family Isuridae (all others being eliminated) there are three known genera with a Tertiary record: Isuris, Lamna, and Carcharodon. The caudal vertebrae in Lamna have reduced the number of radiating lamellae (Hasse 1882, pi. 38,
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. i82 Bulletin So. Calif. Academy Sciences / To/, (i^. Pt. 4, 1^64. Figure 1—Imprint of hums tail from the Miocene Valmonte Diatomite at Wal- teria. There is no indication of a cutwater. The Cetorhinidae lack the deep lateral incisions on the vertebrae (). Within the family Isuridae (all others being eliminated) there are three known genera with a Tertiary record: Isuris, Lamna, and Carcharodon. The caudal vertebrae in Lamna have reduced the number of radiating lamellae (Hasse 1882, pi. 38, figs. 1-4). In the recent great white shark, Carcharodon carcharias (Linnaeus), the spaces made by the radiating lamellae are subdivided. This subdivi- sion results in a honeycombed effect quite distinct from the imprints on the museum specimen (Fig. 1). With these differences in mind, my specimen can be compared to the genus hums, with which it agrees. The genus hums has a long geological record ranging from the Cenomanian of Europe (Wood- ward, 1889) to the Recent. Agassiz (1843) described a number of Miocene species, two of which are now known to be from California: hums hastalis Agassiz and hurus plana Agassiz. In the Valmonte member of the Monterey shale, at the Dicalite. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
Size: 1738px × 1438px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, books, booksubjectnaturalhistory
