48 PROCEEDINGS OF THE ACADEMY OP 



side of the abdomen, with the internal parietes of which it is in close ap- 

 proximation. The intestines all seem crowded backwards, downwards and to 

 the right. There is no apparent constriction between the proventriculus and 

 gigeriuin ; but from the termination of the oesophagus proper the calibre of 

 the canal regularly increases, so that the two stomachs together form a pyri- 

 form mass, its large end directed backward. The walls of the gigerium are 

 thin ; the mucous membrane quite smooth. The pylorus is nearly circular in 

 shape ; i's aperture quite open and direct. It is guarded by elevated folds 

 of mucous membrane, forming partial valves. The opening is situated about 

 the middle of the right side of the gizzard. 



The duodenal fold is between three and four inches in length. It curves 

 around the right side and fundus of the gizzard, separating the latter from 

 the rectum, and thence returns upon itself to its point of departure. 



The intestine then curves around the dorsal aspect of the gizzard until near 

 the median line of the body, whence it descends nearly in a straight line, in 

 the right iliac fossa, almost as far as the rectum. After numerous short con- 

 volutions in this region, it again ascends, on the right of the spine, till it re- 

 gains the dorsal aspect of the gizzard near the origin of the duodenal fold. 

 It then traverses the gizzard from right to left, and descends in the left iliac 

 fossa, half way to the rectum, when abruptly returning on itself along the 

 left side of the spine, it forms a loop about an inch long. Here, after again 

 abruptly reversing its direction so as to point directly backwards, it termi- 

 nates, at the coeca, in the colon. 



There are two cceca, each about one-eighth of an inch long, very small, 

 perfectly straight, obtusely rounded at their extremities, and closely adherent 

 by cellular tissue to the walls of the colon. 



The colon is very short, being less than two inches in length. It is a per- 

 fectly straight tube, running directly backwards along the median line of the 

 sacrum. Its diameter does not exceed the average of the "small" intestines, 

 and is less, in fact, than that of the duodenum. Between the ischia it ex- 

 pands into a large, nearly globular, though somewat pyriform rectum, about 

 an inch in length. A spincter partially guards the recto-colal passage. 



The pancreas in the specimens examined was not, as usual, slender and 

 elongated, and received in the fold of the duodenum ; but was short, thick 

 and obtuse, and closely applied to the right side of the gizzard. 



The spleen measures a third of an inch in length, and is of a flattened, 

 ovoid shape, and dull reddish purple color. It rests on the dorsum of the 

 gizzard, a little to the right, and high up near the proventriculus. 



The liver is large, and its two lobes are of about equal size. They lie one 

 on each side of the abdomen, their commissure being directly on the median 

 line of the body. Their superior concave surfaces combined are in apposi- 

 tion with the gizzard and intestines ; their convex inferior surfaces are accu- 

 rately moulded to the thoracic parietes. Anteriorly they diverge to receive 

 the apex of the heart between them ; posteriorly they are in close mutual 

 apposition. 



The total length of the alimentary canal from pylorus to anus is about 40 

 inches. 



19. Archibdteo lagopus (Briinn.) Gray. 



Rare. A single specimen taken in winter. None others met with. 



(20.) Elanus LEucuRtrs (Vieill.) Savigny. 



The known range of this Hawk includes Arizona : though I am not aware 

 that any examples have actually been brought from the Territory. 



(21.) Nauclerus furcatus (L.) Vig. 



I have been on several occasions assured of the existence of this Kite in 

 Arizona, by reliable if unscientific observers. I have myself never seen it. 



Numerous facts regarding the geographical distribution of this species in- 



[ March, 



