r).]

_Range._--_Trionyx m. calvatus_ is known from the Pearl,
Pascagoula and Escambia river drainages and is to be
expected in the Tombigbee-Alabama river drainage (Fig. 1).
Tinkle (1958:41, fig. 53, stippled) has indicated the
probable range of _calvatus_. This subspecies is unknown
from the Mississippi and Tennessee river drainages, which
are inhabited by _T. m. muticus_. The western limit of
distribution is the Pearl River drainage and probably those
streams of the Florida Parishes of Louisiana that drain into
Lake Ponchartrain. The most easterly record of occurrence
for _T. m. calvatus_ is in the Escambia River drainage; the
eastern extent of geographic range is not known.

I have seen three preserved young turtles having the
characteristic spotted pattern from the Pascagoula drainage
in eastern Mississippi. These specimens are uncatalogued and
in the collections at Mississippi Southern College,
Hattiesburg, Mississippi.

There is a specimen of _T. m. muticus_ labeled as from
Mobile, Alabama (MCZ 1596), for which I believe the locality
datum is incorrect. It is a young turtle having a
well-defined pattern on the carapace and is without doubt a
representative of _T. m. muticus_. Mobile is in the large
drainage basin, of the Tombigbee, Black Warrior, Coosa and
Alabama rivers, which is between the Escambia and Pearl
rivers.

Yarrow (1882:28) reported a specimen of _Amyda mutica_, USNM
11630, from Gainesville, Florida. This record was questioned
by Cahn (1937:179), and has been disregarded by subsequent
authors. Stejneger (1944:23) lists this specimen number with
uncertainty from Mt. Carmel, Illinois. The exact geographic
provenance of this specimen is seemingly unknown.

_Habitat._--I have collected eggs of _T. m. calvatus_ on
sand banks of the Escambia River, Florida. The Escambia
River has a sand-gravel bottom, extensive sandy banks, a
moderately-rapid current, and is flanked by a thick riparian
forest. It is approximately 80 feet wide with fallen trees
and brush intermittently emergent along the shoreline. The
sand bar-habitat along the Pearl River has been mentioned by
Anderson (1958:212). All records thus far are from lotic
habitats.

_Comparisons._--_Trionyx m. calvatus_ is most closely
related