INDEX. 



[NOTK.— The references are to page-figures in brackets.] 



roanthias ^^ 

 nasal aperture in 37 



jAcanthopterygii ^^ 



Accessorisclies stuck '^8 



Acipenser "** 



Acipenserides '*■' 



Actinosts : '^^'^3 



Acusticus foramen 40 



Admaxillary 47,53,56 



A.icassiz, L " 



work cited 41, 81, 89 



Air-breatliing vertebrates posterior nares'of 39 



' Albrecht, work cited 18 



Albula 62,63,65,66,71 



basispbenoid of 66 



cranium of 62,63,118,120 



entopterygoid of *>" 



foramen magnum of 65 



frontals of 62, 63 



hyomandibular of 67 



known species of 6'^ 



nasals of 66 



no gular plate in 62 



opistbotic of 65 



palatine of 67 



palatoqnadrate arch of 67, 118 



parietals of 63 



prefrontals of 62, 63 



prootic of . . - 6i 



quadrate 67 



rear view of the cranium of 64 



squamosals of 63 



symplectic of 67 



teetbof 63,67 



vomer of 63 



vnlpes 61, 70 



Alestes ^^ 



Alisphenoid 20, 22, 31 , 36, 50-54, 56, 61, 66, 69, 70 



circular 70 



descending, process of 53 



Alveolar process 10 



Amia 3, 24, 32, 44, 02, 07, 70, 79, 80 



alispbenoid of 21 



ancestors of 82 



anterior and posterior nares in 39 



anterior nasal aperture of 5, 7 



anterior third of the w all of orbit in . . 21 



basioccipital of 12 



basioccipital much elongated in 51 



branchiostegal rays in 55 



calva, skeleton of 43 



canal beneath the cavum eranii of . . 34 

 E-i-231 



Page. 



Amia, canalis transversus of 33 



carpus of 79 



caudal extremity of 112 



centrum of the hindmost vertebra of. 17 



commencement of tho spinal cord of. . 11 



coossifled vertebra of 65, 70 



coracoids 79 



"cover bones " of the skull in 10 



cranial nerves in 42 



cranium of 9,39,50,90 



dissections of young of 87 



dissections upon 87 



dorsal fin of 85 



ectopterygoid in 54 



entopterygoid of 54 



exoccipitals of 12, 40, 51 



external appearance of 44 



extrascapula of 5 



first occipital nerve of 15 



first spinal nerve in 14 



foramen of the aUsphenoid in 22 



foramen of the labyrinth in 25 



forms of bones in cranium of 22 



forty-fifth vertebra of 85 



fossil 82 



f rontalia of 4 



frontal region of 11 



ganoid plates of 56 



gill-rakers of 56 



gular plate of 50 



history of the skeleton of 43 



hyoidean and branchial arches of 55 



hyomandibular articulation in 41 



hyomandibular of 54 



intermaxilla of 10 



internasal area in 53 



interoperculm of 47 



interorbital septnm in 21 



interspinous bones of 12 



labyrinth iu 26 



labyrinth niches iu . - . 26 



lacrymal of 46 



lateral view of skull of 102 



length of tail in 87 



lower jaw of 75 



mandible of 48,104 



mandible of, inferior aspect 108 



metapterygoid of 54 



movement forward of metapterygoid 



in 55 



mucus canals in head of 6 



uasal bone of 3* 



869 



