290 THE AMERICAN MIDLAND NATURALIST ] 
i 
Boston Soc. Nat. Hist. VIJ: 166-167, [1859]. He exhibited a 
reversed L. ligamentina. 
LEA, Isaac. [Communication on Reversed Unios|. Proc. Acad. 
Nat. Sci. Phila., 1860, pp. 51-53. A very interesting paper— ~ 
worth attention. A list is given of the teratologic specimens in 
Dr. Lea’s cabinet. : 
KEYES, CHARLES R. An Annotated Catalogue of the Mollusca . 
of Iowa. Bull. Essex Inst., XX: 61-83, (1889). Notes the col- 
lection of a number of specimens, but gives no records. 
Stmpson, CHARLES T. The Classification and the Geographical 
Distribution of the Pearly Fresh-Water Mussels. Proc. U.S. Nat. 
Mus., XVIII: 295-843, w. pl. ix. Observations on margaritanoid 
genera, (p. 303), Margaritana monodonta, (p. 304), Dalliella pur- 
purea, (pp. 304-305), and Symphynota compressa, as well as others, 
are interesting, in this paper. Srmpson’s Synopsis of the Naiades, 
or Pearly Fresh-Water Mussels, (Proc. U. S. Nat. Mus., XXII: 
501-1044, (1900)), contains also many scattered notes on dental 
variation. 
A paper by the present writer, already referred to in footnote. 
[rg11]. 
Department of Biology, Guilford College. 
RECORDS OF ADVENTIVE PLANTS. 
Among the plants which as far as I have been able to find 
have not as yet been recorded from our region the following may 
be of interest. Conringia orientalis (Linn.) Dumort., was found 
along the Michigan Central R. R. at Notre Dame. Quite a number 
of plants were seen so that it may be considered as part of our 
flora. Rather more important would appear to be the presence 
of Grindelia squarrosa (Pursh) Dunal. It was found in an alfalfa 
patch about one mile from Hudson Lake in Laporte County. 
A considerable number of plants were apparently well established. 
The most eastern record according to the manuals is Illinois, 
but it seems to be working its way eastward, being probably intro- 
duced with alfalfa seed. Matricaria matricarioides (Less.) Porter 
(Matricaria discoidea DC.) has been established at Notre Dame . 
for many years along walks and on the campus where it reappears 
annually. It is native of the Pacific coast.—/j. A. N. 
Pages 177-228, Vol. IV., published September 20, 1915. 
