NEOPLASMS 473 
surrounded by an indefinite capsule. Judging by the 
observations of Joest and Johne they are reasonably 
common in horses and cows. We have not seen a single 
case in mammals but eight cases appeared in the birds. 
These were with one exception disposed under the skin 
mostly over the abdomen and chest and once under the 
scalp. In a hawk the tumor grew as a pelvic mass sur- 
rounding the cloaca and apparently caused decided 
obstruction to the lumen. The lipomata of the Psittaci 
usually grow as pendulous masses on the abdominal wall 
covered by thin, featherless, delicate skin, often show- 
ing dilated veins. Upon section they are rather rich in 
blood supply, '' angiolipoma," but fail to show any 
angiomatous or solid cellular areas under the micro- 
scope. The frequency of the growths in one variety 
(Roseate cockatoo — Cacatua roseicapilla) led to an 
attempt to transplant the tumor. The plant seemed to 
thrive in the recipient for a while but soon disappeared. 
Breeding experiments on the tumor-bearers are now 
under way. 
Angiomata of lymph channels were observed in the 
omentum and mesentery of a jaguar (Felis onca) ; this 
is the animal wdth three apparently separate and dis- 
tinct tumors. " The omentum is normally fatty and 
slightly congested. In its meshes are myriads of tiny 
cysts containing gray fluid. The main peritoneal area 
is negative but in the pelvic region on anterior rectal 
wall, in the superior edge of the broad ligament and in 
Douglas' pouch, are cysts from a few millimetres to 
several centimetres, with clear contents. The microscopic 
section of omentum shows the multiple cysts as cavities of 
varying size, from that of an arteriole to the diameter of 
a two-third lens field. They are lined with flat, closely 
placed pavement cells with well stained but vesicular 
nucleus. The septa are adult connective tissue. No con- 
tents or granular eosin-staining material. No swollen 
cells like in adenomata. No parasites seen." 
31 
