OF MICROPTERUS CINEREUS. 501 
Fig. 31. Elements of right ramus of mandible of ditto: a, articular; 6, opercular; ¢, 
coronoid; d, angular; e, splenial; 7, dentary. 
Fig. 52. Right lachrymal of ditto. 
Fig. 33. Right quadrate of ditto. 
Fig. 54. Right ramus of lower jaw of a larger individual: a, articular; 5, coronoid; ¢, 
angular; d, dentary. 
Fig. 35. Articulating surface of mandible of adult bird, from above. 
Fig. 36. Condition of right ramus of mandible in an adolescent (flying) bird: a, combined 
articular, angular, coronoid, and opercular; 4, splenial; d, dentary. 
Fig. 37. Right ramus of mandible in adult bird. 
Figs. 38, 39. Hyoid, from above and from the side: a, cartilage ; b, entoglossal ; c, basi- 
hyal; d, hypobranchial ; e, uro-hyal ; 7, cerato-branchial; g, terminal cartilage. 
Fig. 40. a, J, atlas of adolescent bird, from the side and from the front; c, facette 
articulating with occipital condyle. 
Fig. 41. Axis of adolescent bird, from the side: op, odontoid process. 
Figs. 42, 43. Seventeenth and eighteenth vertebre of adolescent bird, from the side: 
n, neurapophysis; d, diapophysis; hy, hypapophysis. 
Fig. 49. Humerus of adolescent bird: 0, impression marking origin of brachialis internus. 
Fig. 50. Ulna of adolescent bird: 0, impression marking insertion of brachialis internus. 
Fig. 51. Internal (ulnar) surface of radius of ditto. 
Figs. 52, 53. Carpal bones of ditto: 52, from the side; 53, from beneath. 
Fig. 54. Metacarpus of ditto. 
Figs. 55, 56, 57. First, third, and second digits of ditto. 
PLATE LXI. 
Fig. 44. a, b, Furcula of adult, from beneath and from the side. 
Figs. 45, 46. Scapula and coracoid of ditto. 
Fig. 47. Sternum of adolescent bird. 
Fig. 48. Sternum of adult bird. The vertebral extremity of the third sternal rib of the 
right side is malformed. 
PLATE LXIL. 
Fig. 58. Pelvis of adolescent bird, from above. 
Fig. 59. Left half of pelvic girdle of ditto. 
Fig. 60. Combined lumbo-sacral vertebre of ditto, from beneath. 
Fig. 61. Left femur of ditto, anterior surface. 
Fig. 62. Left tibia and fibula, ditto. 
Fig. 63. Left metacarpus. 
Figs. 64, 65, 66, 67. Phalanges of the first, second, and third toes: a, metacarpal 
element of first toe. 
VOL. ViI.—PART vil. November, 1871. 4B 
