-19- 
RTLA 1516 (contd.) 
dorsal and ventral sides of the caudal fin. Specimen also 
Habitat: 
Diagnosis: 
Submitter: 
had two growths attached to the webbing of the dorsal fin 
and opaque, slightly raised patches of skin randomly 
scattered over the body wall on the ocular side. 
Notoro Lake, Abashiri City, Japan 
Epidermal papilloma; parasitization by Philometra mariae 
K. Oishi 
RTLA 1517. Limanda schrenki 
Material: 
One gross specimen with a large growth involving both the 
ocular and blind sides of the fish and a portion of the 
dorsal fin. Specimen also had two growths attached to the 
webbing of the dorsal fin. 
Habitat: 
Diagnosis: 
Submitter: 
Notoro Lake, Abashiri City, Japan 
Epidermal papilloma; parasitization by Philometra mariae 
T. Harada 
RTLA 1518. Bluefin tunna, Thunnus thynnus 
Material: 
Tissue from a 45 lb. mass located on the back of the fish; 
Habitat: 
Diagnosis: 
Submitter: 
3 microscope slides; 6 paraffin blocks 
Atlantic Ocean 
Lipoma 
P. P. Yevich 
RTLA 1519. Brook trout, Salvelinus fontinalis 
Material: Tissue; 10 microscope slides; 12 paraffin blocks 
Diagnosis: Lymphocytic leukemia 
Submitter: P. P. Yevich 
RTLA 1520. South African clawed frog, Xenopus laevis 
Material: 
Habitat: 
Diagnosis: 
Six microscope slides 
Laboratory 
Ova regression; probably induced by hormone injection being 
out of phase with the level of ovarian maturation 
Submitter: 
G. E. Cosgrove 
RTLA 1521. Spot, Leiostomus xanthurus 
Material: Gross specimen with a growth displacing the pectoral fin 
Habitat: 
Diagnosis: 
Submitter: 
Specimen also had mucus-like, opaque patches of skin 
randomly scattered over the body wall. 
Patuxent River, Maryland 
Microsporidan xenoma 
J. Peng 
RTLA 1522. Chinook salmon, Oncorhynchus tsL^^.^,tscha 
Material: 
A portion of body wall with an attached protruding ul¬ 
cerated lesion 
Habitat: 
Diagnosis: 
Submitter: 
Little Manistee River, near Manistee, Michigan 
Well-differentiated fibrosarcoma 
J. G. Hnath 
