Memoirs of the Museum of Comparative Zoölogy, at Harvard College, Cambridge, Mass . al process ultimatelyforming the front of the disk has hardly begun; at this stage the latter merely forms a pad in front of thehead. Figures 4 and 5 from a specimen off the coast of New England illustrate the lateral growth of theantorbital portions of the disk to meet the forward extensions of the pectorals and, with the obliterationof the notch opposite each eye, complete the disk. See the .skeleton of N. marmoralus on Plate 67,ao. The batteries are well developed and the disk completely outlined at a very s
Memoirs of the Museum of Comparative Zoölogy, at Harvard College, Cambridge, Mass . al process ultimatelyforming the front of the disk has hardly begun; at this stage the latter merely forms a pad in front of thehead. Figures 4 and 5 from a specimen off the coast of New England illustrate the lateral growth of theantorbital portions of the disk to meet the forward extensions of the pectorals and, with the obliterationof the notch opposite each eye, complete the disk. See the .skeleton of N. marmoralus on Plate 67,ao. The batteries are well developed and the disk completely outlined at a very small stage of Narcinetimlei, fig. 6. In connection with fig. 7-8, showing the young Chlamydoselachus with well differentiatedfins and gills, see also fig. 4-5, Plate 59. The embryo of Rhina mliforiiica, fig. 9, was attachedto an enormous mass of yolk, longer and many times the weight of the little shark. Figures 10 and 11show the intestines and their connection with this yolk, the dotted lines indicating the entrance in frontof the spiral folds. J Mem. Mus. Comp. 3 _?-•<. -i Ot i ^ 62. PLATE 62. ISURIDAE. Fig. 1-3. IsuRus PUNCTATTTS (Page 36). 1. Dorsal view of the skull, vertebrae, branchial cartilages, and shoulder girdle. 2. Lateral view of the skull, jaws, teeth, branchial cartilages, and shoulder girdle. 3. Ventral view of the skull, jaws, teeth, branchial cartilages, vertebrae, and shoulder girdle. J Mem. Mus. Comp. Zool., Vol. 36. PLAGtOSTOMES. PLATE 62.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1913
