220 MARSHALL— A STUDY OF THL [June 19, 



The fused kidneys (A'.) extend from the lungs to the pelvic 

 cavity. The right kidney, slightly larger than the left, consists of 

 three lobes, the middle one being the smallest. The two lobes of 

 the left kidney are of about equal size. The ureters { Ur. ) pass 

 posteriorly to the cloaca which they enter on its dorsal surface 

 median to the oviducts. 



IV. Central Nervous System (PI. I, Figs. 2, 3 ; PI. II, Fig. i6a). 



The brain of this bird is notably small as compared with the size 

 of the head. Its length much exceeds its breadth, resembling in 

 this respect the brain of a lizard. The large optic lobes ( Op. I.) 

 are only partially covered by the cerebral hemispheres. The cere- 

 bellum (67;.), which is comparatively large, covers the medulla 

 oblongata {Med.) and on each side of it a flocculus {Flo. ) is 

 found. The greatest length of the cerebrum {Cere.) is about 8 

 mm., its width 9.5 mm. The longest measurement of the cere- 

 bellum is approximately 6 mm., its breadth above the flocculi 5 

 mm. The uncovered portion of the optic lobes measures from 

 dorsal to ventral surface about 5.5 mm., anterior to posterior border 

 3 mm. No drawings or measurements of the ventral surface of the 

 brain could be made on account of its torn condition. 



The spinal cord {Sp.), is marked by two important swellings; 

 one in the cervical region known as the brachial plexus {Br. u.) 

 (PI. II, Fig. 1 6a), and one in the posterior region as the sacral 

 plexus. Anterior to the brachial plexus the cord is larger than it 

 is between this plexus and the succeeding one. The swelling which 

 indicates the branchial plexus begins at the tenth nerve and termi- 

 nates with the thirteenth. Three nerves take part in the formation 

 of this plexus, the eleventh, twelfth and thirteenth. The second 

 or middle nerve is the largest of the three, the third the smallest. 

 Soon after leaving the cord the second nerve bifurcates, one branch 

 going to each of the other two and all intimately related. The 

 posterior part of the spinal cord was too badly broken for the nerves 

 of that region to be made out. 



V. Sense Organs (PI. IV, Figs. 2, 4, 5). 



The nostrils {N~os. ) are tubular and cylindrical, opening for- 

 ward and outward. Vibrissas, very much shorter and more delicate 

 than those around the gape, are observed about the nostrils. These 



