Memoirs of the Museum of Comparative Zoölogy, at Harvard College, Cambridge, Mass . e. N rise H EP, cei. eeCMArrxK aO!tTor< PLATE 69. PLATE 69. Fig. 1-2. Sqdalus acanthias. M. C. Z. 35 (Page 192). Fig. 3. Ginglymostoma C. Z. 819 (Page 54). Fig. 4-6. anguineto. M. C. Z. 1247, 1285 (Page 14).Fig. 7-8. MoBULA HYPosTOMA. M. C. Z. 683 (Page 453). Fig. 9-10. Rhinoptera C. Z. 863 (Page 447). Figure 1, | natural .size, and fig. 2, natural .size, exliibit the outer and the internal yolk-sac, theheart with arteries, the liver, the stomach, and the intestine.

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Memoirs of the Museum of Comparative Zoölogy, at Harvard College, Cambridge, Mass . e. N rise H EP, cei. eeCMArrxK aO!tTor< PLATE 69. PLATE 69. Fig. 1-2. Sqdalus acanthias. M. C. Z. 35 (Page 192). Fig. 3. Ginglymostoma C. Z. 819 (Page 54). Fig. 4-6. anguineto. M. C. Z. 1247, 1285 (Page 14).Fig. 7-8. MoBULA HYPosTOMA. M. C. Z. 683 (Page 453). Fig. 9-10. Rhinoptera C. Z. 863 (Page 447). Figure 1, | natural .size, and fig. 2, natural .size, exliibit the outer and the internal yolk-sac, theheart with arteries, the liver, the stomach, and the intestine. Figure 3, /j natural length, is the egg ofGinglymostoma, the embryo showing through the shell. Figure 4-5, f nat., show the egg with theembryo of Chlamydoselachus. Fig. 7-8 show the ajjpearance of the gill plates of Mobuhi, and those of Rhinoptera. There is in the latter a longitudinal division of the plates into upper andlower parts, in fig. 9 there are also seen modifications to some intermediate in character betweenthe plates in fig. 10 and those of Mobula. F

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1913