A. Sircv~ icl
So t;~r its (:all be i ~ ~ ( ' ( > r t i ~ i ~ ~ ~ ( l ,
no t ~ ~ r n o i ~ r s
have been reported, as yet.
in the Sirenin.
I<. l'innipcdia
The Pinriipedia include all seals, sea lions and walruses. They are
amphibious creatures, spending much time out of the water and belong
to the family Otariidae, which includes many genera. To date only 7
neoplasms have been documentetl representing 7 species. From the
examination of such a small number of tumours, i t is difficult to oomment, except to note that neoplasia of the blood and reprodrlctive
systems account for all but one af them. Hepatic lipomatosis (Larsen,
1962), in all probability, does not represent a truly neoplastic condition. Larsen said little about his two cases of neoplasia. one in a seal
Phoca vitulina Linnaeus, 1758. This was a two year old female animal
which presented with generalized lymphadenopathy, splenomegaly and
hepstomc~galy. Hi~tologic;ll clia,gnosirs confirmed a lymphadenosis.
FIG. 22. Enlarged spleen from a Harbour Sonl suffering from lyrnphatlc leukaemia