Memoirs of the Museum of Comparative Zoölogy, at Harvard College, Cambridge, Mass . Dorsal view of brain. M. C. Z. 1292. 2. view of brain. M. C. Z. 1291. 3. Ventral view of brain. 4. Dorsal view of brain. 5. Nasal sac, bisected. 6. Dorsal view of brain. M. C. Z. 1288. 7. Ventral view of brain. 8. Lateral view of brain. 9. Dorsal view of brain. M. C. Z. Ventral view of brain. From tlie brain of tlie Carcliaridao, Plates 40 and 41, tliere was in the Vulpcculidae, Plate 42, amarked increase in the plication of tlie hind brain with a less considerable one in the size of the fore b
Memoirs of the Museum of Comparative Zoölogy, at Harvard College, Cambridge, Mass . Dorsal view of brain. M. C. Z. 1292. 2. view of brain. M. C. Z. 1291. 3. Ventral view of brain. 4. Dorsal view of brain. 5. Nasal sac, bisected. 6. Dorsal view of brain. M. C. Z. 1288. 7. Ventral view of brain. 8. Lateral view of brain. 9. Dorsal view of brain. M. C. Z. Ventral view of brain. From tlie brain of tlie Carcliaridao, Plates 40 and 41, tliere was in the Vulpcculidae, Plate 42, amarked increase in the plication of tlie hind brain with a less considerable one in the size of the fore Plato 43, the much greater advance of the Cestraciontidae is seen both in the volume of the fore brainand the complexity of the hind brain; these are more advanced in the Cestraciontidae than in theCarcharinidae, the nearest alHes, for instances see fig. 4, Carcharinus platyodon, and figs. 6-8, Galcoccrdoarclicus. Tliat the archaic family Squalidae is much lower in rank is indicated by the smooth hindbrain and the smaller amount of the fore brain. .J Mew Mus Comp, Zool .. iSC MER, DEL PLATE 44. PLATE 44. RAIIDAE and DASYBATIDAE. Fig. 1-3. Raiascabrata (Page 340). Fig. 4-6. Raiastabuliforis (Page 341). Fig. 7. D.\.sy-BATUS marinus (Page 382). 1. Brain from above. M. C. Z. 1289. 2. Brain from the side. 3. Brain from below. 4. Brain from above. M. C. Z. 1294. 5. Ear from the side. 6. Brain from below. 7. Brain from above. M. C. Z. 1287. The comparative amount of the brain is mucli the same in these families but the higher rank of theDasybatidae is plainly indicated in the greater complexity of the hind lirain. Mem Mus Comp 7ooi Vol
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1913
