PLATE 52. 



Pelvis of ANTACEA and DIPNOI. 



Fig. 1. ScoLioDON LONGURio. M. C. Z. 694 (Page 114). Fig. 2. Hbmigaleus pectoralis. 

 M. C. Z. 847 (Page 150): Fig. 3. Pkistiophorus japonicus. M. C. Z. 1045 (Page 246). Fig. 4. 

 Protopterus annectens. M. C. Z. 8964. Fig. 5-7. Ceratodus forsteri. M. C. Z. 9827. 



The pelvis of the Antacea, fig. 1-3, is radically different from that of the Dipnoi, fig. 4-7. The 

 differences are of such characters that no evidences of close relationships are evident. The structure 

 in the sharks, the Antacea, is farther than that in certain of the more specialized of the Plato.somia, the 

 Potamotrygons, for instance, Plate 54, fig. 1-2, from that in these Dipnoi; yet undoubtedly such re- 

 semblances as exist between the pelvis of the Lung Fishes and that of the River Trygons, in the median 

 propelvic cartilage, is due to similarity of conditions and habits and not to inheritance from common 

 ancestors. The pelvis of Polypterus is still more remote, nearer to that of bony fishes. 



