Memoirs of the Museum of Comparative Zoölogy, at Harvard College, Cambridge, Mass . ph.^norhynchus C. Z. 1048 (Page 28). Fig. 3. Orbctolobds j.\ M. C. Z. 1038 (Page 50). Fig. nMBRATiLE. M. C. Z. 1044 (Page 80). Fig. 5. M. C. (Page 36). Fig. 6. Prwtiophorus M. C. Z. 1045 (Page 246). Fig. 7. Rhinoba-Tus M. C. Z. 430 (Page 278). Fig. 8. M. C. Z. 1120 (Page289). Fig. 9. Narcacion marmoratus. M. C. Z. 42 (Page 305). Fig. 10. Nakke C. Z. 1114 (Page 314). Rather generally the
Memoirs of the Museum of Comparative Zoölogy, at Harvard College, Cambridge, Mass . ph.^norhynchus C. Z. 1048 (Page 28). Fig. 3. Orbctolobds j.\ M. C. Z. 1038 (Page 50). Fig. nMBRATiLE. M. C. Z. 1044 (Page 80). Fig. 5. M. C. (Page 36). Fig. 6. Prwtiophorus M. C. Z. 1045 (Page 246). Fig. 7. Rhinoba-Tus M. C. Z. 430 (Page 278). Fig. 8. M. C. Z. 1120 (Page289). Fig. 9. Narcacion marmoratus. M. C. Z. 42 (Page 305). Fig. 10. Nakke C. Z. 1114 (Page 314). Rather generally the number of rows of valves in the conus of the Antacea 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 comparing Rhinobatus, fig. 7, of this Plate withgreatly specialized types, Plate 67, fig. 1-6. Mem. Mu? c~« ^ . u
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