-15- 
RTLA 2415. Redhorse sucker, Moxostoma sp. 
Material: 
Habitat: 
Diagnosis: 
Two microslides 
New York: Lake Erie, vicinity of Lackawanna 
Gut - infiltrative adenocarcinoma 
Submitter: 
Gonad - granuloma to helminth ova 
J. J. Black 
RTLA 2416. Freshwater drum, Aplodinotus grunniens 
Material: 
Habitat: 
Diagnosis: 
One microslide 
New York, Tonawanda: Niagara River 
Liver - hepatocellular carcinoma, basophilic, 
well-differentiated type 
Submitter: 
J. J. Black 
RTLA 2417. American toad, Bufo americanus 
Material: Piece of skin with wart-like lesions 
Diagnosis: Multiple Dermocystldlum sp. pseudocysts of dermis 
Submitter: R. B. Clapp 
RTLA 2418. Sheepshead, Archosargus probatocephalus 
Material: 
One microslide of intestine experimentally exposed 
to diethylnitrosamine (DENA) 
Habitat: 
Mississippi, Hattiesburg: University of Southern 
Mississippi 
Diagnosis: 
Submitter: 
Recent extensive submucosal hemorrhage 
B. J. Martin 
RTLA 2419. Sheepshead, Archosargus probatocephalus 
Material: 
One microslide of viscera experimentally exposed 
to DENA 
Habitat: 
Mississippi, Hattiesburg: University of Southern 
Mississippi 
Diagnosis: 
Submitter: 
Toxic changes within recoverable range 
B. J. Martin 
RTLA 2420-2423. 
Material: 
Sheepshead, Archosargus probatocephalus 
One microslide each of viscera/gills experimental¬ 
ly exposed to benzidine (BEN) 
Habitat: 
Mississippi, Hattiesburg: University of Southern 
Mississippi 
Diagnosis: 
RTLA 2420 - incipient hepatocarcinoma; distended 
ducts suggesting obstructed bile flow; patches of 
glycogen depletion; RTLA 2421 - "normal"; RTLA 
2422 - possible hemangioendothelioma; RTLA 2423 - 
possible very early hemangioendothelioma 
Submitter: 
B. J. Martin 
RTLA 2424. Bagre pintado, Pimelodus clarias 
Material: One tissue block; 7 color transparencies; 9 black 
and white photographs 
Habitat: Venezuela: lagoon with agricultural runoff 
Diagnosis: Malignant lymphoma, well-differentiated 
Submitter: H. E. Urdaneta Ch. 
