260 Trans. Acad. Sci. of St. Louis. 
33. Trionyx Spiniferus. (Le S.) The Spiny Soft Shell Turtle. 
ot quite so abundant as the preceding one, but still often enough met 
with. Found in the Mississippi river, Merimac river and Illinois river. 
SUB-ORDER TESTUDINATA. 
FamMILy CHELYDRIDAE. 
GENUS CHELYDRA. (Schweigger.) 
34. Chelydra Serpentina. (Linn.) The Snapping Turtle. 
A common e; found in the river, creeks, ponds and sloughs in Mis- 
souriaud Illinois. Old specimens are sometimes so covered with moss, that 
they have the appearance of a rock in water. I have seen specimens weigh- 
ing as much as 24 pounds. 
GENUS MACROCLEMYsS. (Gray.) 
35. Macroclemys Temminkii. (Troost.) Alligator Snapper. 
This is a very rare turtle in this neighborhood. I have one - i collec- 
tion which comes from Cottonwood Point, Pemiscott County, Mo. The 
fishermen bring them to the market as a curiosity, but they pa not valued 
as much as the common snapper. 
FAMILY KINOSTERNIDAE. 
GENUS AROMOCHELYS. (Gray.) 
36. Aromochelys Odorata (Bosc.) Musk Turtle cr Stink Pot 
It is essentially an aquatic turtle, found in ponds and déep creeks. Par- 
ticularly in spring the old males smell strong after musk. It is a small 
turtle in size, and with the first Warm day they come out of their winter 
quarters to enjoy the sun. 
FAMILY TESTUDINIDAE. 
GENUS CHRYSEMYS. (Gray.) 
37. Chrysemys Troositi. (Holb. ) The Yellow Bellied Terrapi 
Very little is known of this turtle, as it is only caught by setiilng in the 
deep water of the Mississippi river. 
38. Chrysemys Elegans. (P. Max de Wied.) The Elegant Terrapin. 
A common turtle in the Mississippi river and in the lakes and ponds. 
Found in St. Clair and Madison counties, Ill., and St. Louis County, Mo. 
They make their appearance in spring as soon as the ice has disappeared. 
39. Chrysemys Belli. (Gray.) Bell’s Tartle. 
The common turtle of this neighborhood. This turtle seems to prefer 
winter time I could see them in a kind of torpid state in the bottom of 2 
creek buried half way in the mud. 
GENUS MALACLEMYsS. (Gray.) 
_ 40. Malaclemys Pseudo-Geographica. (Le S$.) Le Sueur’s Map Turtle. 
An abundant turtle in the Mississippi and its back waters, both in Mis- 
souri and Illinois. They are commonly called the ‘‘Saw Back” turtle on 
“eae the toothed ridge along the center of the back. 
