280 THE AMERICAN MIDLAND NATURALIST 
Clarke), Clarke, Ind. (Umbach), 9265, 10516 Notre Dame, 7755 
St. Joseph, Mich. 
PERSICA (Pliny, Theophr.) Tabernaemontanus, Auguillara 
Lacuna, Gerard, Camerarius, Tragus, Fuchs, Hist, 205a (1549). 
Persicus Palladius, Persicum T. Gaza. 1529 Malum persicum 
Pliny, 13:19. Persica Tour. Elem. 496 (1694), I. R. H., 624 (1700). 
Persica Duham. Arb., II, 105. (1755). 
(T be continued.) 
UNIONIDAE WITH ABNORMAL TEETH. 
BY SAM. W. GEISER. 
The following brief list, notes, and partial bibliography, is 
given as a contribution to the scanty literature dealing with 
this phase of molluscan life and teratology. 
In the years 1908-1911, the writer collected a considerable 
amount of molluscan study-material, from the various rivers of 
_the northeastern part of the state of Iowa, particularly in 
Buchanan, Fayette, Clayton, Allamakee, and Winneshiek Counties. 
In the summer of 1913, the waters of a number of other rivers 
in Iowa were examined. 
It is surprising to find how large a percentage, relatively, of 
the mollusks of this group are either abnormal, or in some way 
diseased, in certain restricted localities, while one may go over, 
carefully, a large number of shells from other stations, without 
finding any teratologic specimens. All but one of the specimens 
noted came from the Wapsipinicon river near Independence, Iowa. 
Briefly listed, they are: 
SHELL WITH ONE PSEUDOLATERAL IN EACH VALVE: 
Lampsilis luteola, #, 4 years old, 9°, 5 years old. 
Lampsilis ventricosa, 2, 6 years; w. 3 pseudocardinals in 
right valve, sex? 2 yrs.’ 
LATERALS OF BOTH VALVES FLATTENED: 
Lampsilis ventricosa, &, 12-15 yrs. (Cardinals gone by 
dental caries.) 
NO PSEUDOCARDINALS IN RIGHT VALVE: 
Lampsilis luteola, &, 6 yrs. 
1 See in this connection THis JouRNAL, Vol. IT, pp. 65-67, 1911. 
