33 
formity. The microscopical section of bone shows 
a myelomatous growth . of costal marrow, new 
proliferating myelocytes predominating. This is 
invading the cartilagenous bone with absorption. 
In some places the cartilage is of fetal type. The 
perichondrium is active but there is no round 
cell infiltration. Ossification is imperfect at the 
costro chondral junctions. 
LiTHIASIS. 
There were two cases of nephrolithiasis this year. 
They concern a Tasmanian Devil (Sarcophilus ursinus) 
and a Water Mongoose {Herpestes hrachyurus), the for- 
mer a marsupial, the latter a carnivore. The concre- 
tions in both instances were tiny uratic calculi and sand 
affecting the kidney pelvis and the apical parts of the 
pyramid. In both animals a nephritis of some standing 
existed and in the Tasmanian Devil, a mild pyelitis. 
Both animals were posted for the taxidermist, so that 
a close inspection of the joints was not possible, but in 
neither case was there any chondritis of the ribs or in- 
tervetebral discs that could be observed by intrathoracic 
examination. 
A small deeply pigmented hard calculus was found 
in the tortuous lower end of the gall bladder of a Mon- 
goose Lemur (Lemur mongoz). There was no obstruc- 
tion to the flow of bile by the stone. No jaundice 
existed. No macroscopic change existed in the gall 
bladder. 
Osteomalacia. 
Only two cases were found this year (Western Fox 
Squirrel, Sciurius rufiventer — Silky Marmoset, Leon- 
tocehus rosalia 9). They presented no new features. 
It is encouraging to note that we have had only this 
one case of this bone condition in primates since our 
report of 1912. To my recollection no monkey appear- 
ing to have the disease has arrived in the last year. The 
