[129] 



THE OSTEOLOGY OF AMIA CALVA. 



875 



Page. 



Olfactory, course of the fibers of 34 



membrane 35 



mucous membrane 34, 36 



mucous membrane, bulbi olfac- 



torii of 34 



nervo 34, 35,36, 51, 59 



course of 42 



of Amia, passage of 



the 10 



nervelets 35 



region 34 



Opercular apparatus 28 



bones 28, 56, 79 



modified branchiostegal 



rays 72 



Operculum 28, 53, 55, 56, 71, 72 



Ophidia 53, 56 



Opisthotic 10, 50, 51, 52, 56, 58, 61, 64, 78 



Optic foramen 22,31,60 



nerves .- ■ 53, 70 



Opticus nerve 32 



Orbit 66 



upper margin of 20 



Orbital cavity 66 



muscles 53, 61 



Orbitar process 49 



Orbitosphenoid 35, 51, 52, 53, 56, 58, 61, 66, 69, 70 



Orbito-spbenoids, circular 70 



Orcynus thynnns 59 



Ord, "Wm. M., work cited 91 



Os articulare 77 



lower jaw of 76 



Os coracoidien 78 



Os du carpe 78 



Os linguale 73 



Ossa petrosa 31 



Osseous fishes, nares in 38 



nasal bones of 5 



posterior nasal aperture in. 39 



Ossiciila auditus 28 



Ossifications, septo.maxillary 56 



Otic bones 56 



region 55 



Otoliths 27 



Owen, Sir Richard 71,77,78 



Owen, work cited 45, 75, 81, 83, 91 



Palatal arch 30 



Palatine 53, 54, 56 



arch 23 



segments of the 10 



teeth of 9 



Palato pterygoid arcade 49, 53 



Palato-quadrate arch 61, G6, 71, 73 



Palato-quadratum 29 



Paraglenial 77, 78 



Parapophy ses 84, 85 



Parasphenoid 9, 10 



19, 21, 31, 50, 51, 60, 62, 63, 64, 66, 70 

 number of vertebrae covered 



by 19 



posterior limbs of 16 



teeth of 8,9 



Parietal 6, 7, 11, 45', Gl, 69 



dermo.plates 45 



.4, plates 45 



Page. 



Plates, posterior margin of the .^. . . 13 



Paritalia 4 



Parker 43, 60, 71, 77, 78 



Parkei-, W. K., and Bettany, G. T., work 



cited 91 



Parker, TT. K., work cited 53,61,91 



Pecten 12 



Pectoral fin 79, 81, 82, 86 



limb, combined actinosts of 83 



rays •. 83 



Pelvic bones 80 



bones, position of 82 



fins 82 



Perca 88 



Perca, Americana 60, 75, 108 



Perch 75 



American 60 



cranium of a 108 



Perenni.branchiates 38 



Periorbital, lymph sinuses 33 



Periotic mass 61 



Petrosal 13, 14, 20, 26, 50 



openings near the anterior margin 



of 20 



Philadelphia transactions 53 



Physostoma 40 



Physostomi 2 



Pia mater 34 



Pigment cells 8 



Pike 38, 56 



cartilagenoas rostrum of 23 



free occipital arches in the 13 



prenasal rostrum in 53 



voniei- of 10 



Pisces, muscular system of 3 



nervous system of 3 



organs of sense of 3 



visceral skeleton of 3 



Piscine skuU, relation of the various bones 



of 74 



Pituitary fossa 53 



Polypterus 6, 19, 30. 50. 57, 86 



a free occipital arch in 13 



ethmoid of 53 



hyomandibular cleft in 30 



Leydig's investigation of 9 



gular plates of 50 



Pomacentrides .^ 39 



Poste.ro-alar projections 63 



Posterotemporal 78 



Posttemporal 01 



Postfrontals .-.. 6,8,10 



20, 22, 24, 25, 50, 51, 58, 61, 62, 64, 66, 67, 71 



Postoral arches 40 



Postorbital processes 10, 20, 41 



Postorbitals 46 



Posttemporals 45, 77 



Posttemporal elements 78 



Postclavicles 78 



Postzygapophyses 65, 88 



Precoracoid 78 



Prefrontal 6, 8, 10, 21, 24, 50, 54, 60, 63, 50, 69, 71 



Premaxillffi 51,56 



teeth on 54 



PremaxiUary 50 



