File:Memoirs of the Museum of Comparative Zoölogy, at Harvard College, Cambridge, Mass (1913) (14595803630).jpg

Identifier: memoirsofmuseumo3602harv (find matches)
Title: Memoirs of the Museum of Comparative Zoölogy, at Harvard College, Cambridge, Mass
Year: 1913 (1910s)
Authors: Harvard University. Museum of Comparative Zoology
Subjects: Zoology
Publisher: Cambridge (Mass.) : The Museum
Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library

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d in the consoHdation, the articulation of the erectile spine, and the condition of the notochord,without rings in Callorhynchus, fig. 1, with rings in Chimaera, fig. 2. Figures 3-10 are from among thelowest to the highest of the Platosomia. They indicate the gradually increasing number of the vertebraetaking part in the anchylosis, with the decrease in size and withdrawal backward of tlie lateral wings orstays so prominent in the Pristidae, fig. 3, the scapulary attachment of the shoulder girdle superior inPristidae and Rhinobatidae, fig. 3-4, inferior in the Raiae, fig. 5, and a lateral articulation in Dasybatidae,fig. 7, Potamotrygonidae, fig. 6, Myliob.atidae, fig. 8, Rhinopteridae, fig. 10 and the Mobulidae. Thedifferent styles of attachment of the .shoulder girdle apparently divide the Platosomia into groups. Aconsiderable increase in irregularity of vertebrae and processes obtains as the most specializedgenera are approached. Mem. Mus. Comf 7oot. Vol, 36. PLAGtOSTOMES. PLATE 55
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E. N. FISCHER, DEL COCKAVNE. BOSTON PLATE 56. PLATE 5e. HEART. Fig. 1. HEPTR.\NCHiAa PERLO. M. C. Z. 945 (Page 21). Fig. 2. Scaph.^norhynchus owstoni.M. C. Z. 1048 (Page 28). Fig. 3. Orbctolobds j.\ponicu.s. M. C. Z. 1038 (Page 50). Fig. 4.Cephai-o.scyllidm nMBRATiLE. M. C. Z. 1044 (Page 80). Fig. 5. Lsoru.s pdnctatd.s. M. C. Z.1249 (Page 36). Fig. 6. Prwtiophorus japonicu.s. M. C. Z. 1045 (Page 246). Fig. 7. Rhinoba-Tus PERCELLEN.S. M. C. Z. 430 (Page 278). Fig. 8. Di.scobatos sine.nsis. M. C. Z. 1120 (Page289). Fig. 9. Narcacion marmoratus. M. C. Z. 42 (Page 305). Fig. 10. Nakke japonica.M. C. Z. 1114 (Page 314). Rather generally the number of rows of valves in the conus of the Antacea decrea.ses with advance inrank, with increase in specialization. For proof of this compare Heptranchias, fig. 1, Scapluuiorhynchus,fig. 2, Isurus, fig. 5, and Pristiophorus, fig. 6, with Orectolobus, fig. 3, and Cephaloscyllium, fig. 4. In thePlatosomia the rule does not hold so well, as is shown by c

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