471 
bury themselves in the mud-cracks, and hide under leaves and in 
crawfish chimneys. The old stumps in and about this area afford 
shelter for several species of land mollusks. 
The following species of Mollusca were secured. 
FLUVIATILE SPECIES. 
Spherium occidentale. Common. 
Physa gyrina. Rare. 
Lymnea caperata. Rare. 
LAND SPECIES. 
Agrioumax campestris. Common. 
Zomttoides arboreus. Common. 
Strobilops virgo. Rare. 
The following were associated with the land mollusks. 
BEETLES. 
Penthe obliquata; adult. 
Meracantha contracta; adult. 
Alobates pennsylvanicus; adult. 
Amtsodactylus baltimorensts; adult. 
Scotobates calcaratus; adult. 
Patrobus longicornis; adult. 
Pterostichus scrutator; adult. 
Alaus oculatus,; larva. 
ORTHOPTERA. 
Ischnoptera sp. Cockroach (nymph). 
CRUSTACEA. 
Cambarus blandingi acutus. Crawfish. 
STATION XX. 
A small pool east of Station XVIII, extending from the edge of 
the woods into the open field. The pool is shallow, irregular in 
shape and bordered by a few scattering trees from Station XVIII, 
among which the button-bush (Cephalanthus occidentalis) is con- 
Spicuous. It is dry in the summer and fall. Physa gyrina was the 
only animal observed, and this was very abundant. 
