220 
FOURTEENTH REPORT. 
glaucophylla, Eriopliorum callitrix, Dracocephalnm parviflorum, Loni- 
oera oblogifolia, Ceanothus ovatus, etc. Some of the bog forms occur in 
a bog adjacent to the area on the west and they possess no great signi- 
ficance. 
Most of the more northern forms of animals have been earlier driven 
from this section. There may be mentioned Sciurus carolinensis leu- 
cotis, (melanistic variety), sciurus hudsouius loquax, still fairly com- 
mon; sciuro]>terus sabrinus macrotus and Lepus americanus. The lat- 
ter is occasionally taken. The southern flying squirrel is more common- 
lv found. 
v * 
Some of the southern forms whose distribution in the interior are 
of interest are mentioned below. Some of these are known to occur 
farther north in the interior, and others will doubtless be found to do 
so. Some of them have been pointed out by other writers as illustrating 
the northward movement of forms along the borders of the State. The 
list includes such forms as: 
Adiantum pedatum (common), Oarya macrocarpa, Carya ovata, 
Juglans cinerea (said to have been abundant formerly), Juglans nigra, 
Liriodeudron tulipifera (rare), celastrus scandens, Sassafras variifol- 
ium Bezoin aestivale. 
Blue tailed skink (Eumeces quinquelineatus Linueaus), Storeria de- 
kayi Holbrook, Leopeltis vernalis DeKay, Lampropeltis doliatus trian- 
gularis Boie, Cliorophilus nnigritus triseratus Wied, Necturus maculosus 
Kefinesque, Diadelphis virginiana. 
It is seen that the area is rich in its types of vegetation. All forms 
of general occurrence in the state are present together with a notable 
proportion of northern and southern forms. The differences between 
the coastal regions and the interior at this latitude are certainly much 
less than the literature on the subject would lead one to expect. This 
question however must depend upon a closer study of all the factors 
• involved. 
The following list of Mammals represents some interesting transi- 
tional features. As the area under consideration lies in the center of 
the lower peninsula and extends from the plains of the Grand-Sagi- 
naw valley and the early glacial lakes on the south and east to the clay 
and sand moraines of the interlobate region of the Michigan and Sagi- 
naw lobes on the west one may expect to find some relation between 
these physical and historical features on the one hand and the fauna 
and flora on the other. It serves to give the region a biota representa- 
tive of both the northern and southern types and also some intermediate 
stages. The flying squirrels may be mentioned in this connection, and 
the retreat of some of the northern forms to points farther north, for 
example, the varying hare and other species which left the area earlier. 
The area must also represent or lie near the northernmost limit of distri- 
bution of the American Opossum. A number of the smaller mammals 
not given here undoubtedly occur, but as no good records for them 
have been obtained they are left for verification. 
