Memoirs of the Museum of Comparative Zoölogy, at Harvard College, Cambridge, Mass . o> :oo oo. PLATE 75. PLATE 75. I MOBULIDAE. j iFig. 1-2. MoBUL.^. HYPOSTOMA (Page 453). A course of evolution resembling the actual course traversed by Mobula from an ancestral form likethe Dasybati may be traced through Myliobatis, Aetomylaeus, and Rhinoptera by means of the pectoral and the cephalic — connected and meeting in front of the head and lacking the modified radials | opposite the gills in Myliobatis, disconnected at the sides but still meeting in front and possessed of the I modified radia
Memoirs of the Museum of Comparative Zoölogy, at Harvard College, Cambridge, Mass . o> :oo oo. PLATE 75. PLATE 75. I MOBULIDAE. j iFig. 1-2. MoBUL.^. HYPOSTOMA (Page 453). A course of evolution resembling the actual course traversed by Mobula from an ancestral form likethe Dasybati may be traced through Myliobatis, Aetomylaeus, and Rhinoptera by means of the pectoral and the cephalic — connected and meeting in front of the head and lacking the modified radials | opposite the gills in Myliobatis, disconnected at the sides but still meeting in front and possessed of the I modified radials in Aetomylaeus and Rhinoptera — or by means of the projjterygial bases of the pectorals, j or even by means of the outer branchial rays their attachments and their transformations quite as readily j as by means of the dentition, the narial cartilages, or the skull itself. The cranium of Mobula is broader | and more indented in the forehead than that of Rhinoptera. The cephalic fins are distant from oneanother in front of the head; they are radically separated from the pectorals, the an
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1913
