36 
Tumors. 
3179. Waltzing Mouse (Mus wagneri rotans)^ retro- 
peritoneal lymphadenoma with extension to spleen; 
3194. Canada Procupine (Erethizon dorsatus dorsatus), 
chorionepithelioma ; 
3211. Gray Fox {Canis cinereo-argenteus) , papillary 
cyst adenoma of the bile ducts; 
3250. Indian Elephant {Elaphus indicus) multiple 
calcified fibroid tumors of uterus, leiomyoma of uterine 
cornu ; 
3322. Undulated Grass Parrakeet (Melopsittacus un- 
dulatus), adeno-carcinoma sarcomatodes of liver, leio- 
myofibroma of spleen; 
3490. Undulated Grass Parrakeet {Melopsittacus un- 
dulatus) papillary cyst adenoma of kidney. 
Akin to tumor formation in microscopical structure 
and because it cannot be associated with inflammations 
elsewhere should be noted the splenomegally of large 
lymph-cell type in the White-throated Jay Thrush 
{Garrulax alhigualris) No. 3373. There is in this bird a 
large lymph-cell transformation of the spleen apparently 
originating in the follicular center and replacing all the 
splenic tissue. Such a metaplasia or hyperplasia is 
practically unknown in simple splanitis and there us no 
focus of inflammation of sufficient age to give a chronic 
splenitis. The organs aside from the spleen are negative 
and are practically normal. 
The picture in the spleen is not that of Gaucher 
splenomegaly, nor of infectious leukemia such as was 
reported in 1908 from this laboratory. For the present 
a diagnosis of the histologial form of this hypertrophy 
must be retained. No parasitic bodies were seen; 
bacteriological studies were impracticable. 
Notes. — The body was considerably mutilated but seemed to have been in healthy 
condition. The organs are negative aside from a sUght pallor, except the spleen which is 
enlarged probably ten times, and bent on itself Uke a v; capsule is smooth and spanned; 
surface shows large follicle-like areas separated by pink lines. On section this appear- 
ance is maintained, the whole organ being made up of large pale fairly well outlined follicles. 
It was not possible to make a reliable blood examination because of the coagulation of the 
blood and the mutilation of the body. Histologically the spleen corresponds with the 
architecture observed grossly. The folUcels are soUd accumulations of large lymphocytes 
with practically no intercellular substance and no small lymphoid elements. The sup- 
porting tissue is either distinctly fibrous, as about the blood vessels or as irregular bands 
of round and tissue cells with delicate fibers. The section makes one think of the cellular 
deposites of myelogenic leukemia or large cell lymphatic leukemia. 
