H Pearson 1950 9 about 1/2 mi past the big quarry operated by the Pacific Portland Cement Co. from the quarry on the road is roughly like this: quarry little dam bigger than cave path -> to Placeriella The cave consisted of two fairly large chambers with lots of nooks & crannies suitable for bats although the chambers themselves were somewhat light for bats. Then came a wild goose chase looking for the small cave N on route 40. We finally found the mentioned cave, which was small & had for droppings in it, but wasn't suitable for bats -- quite lite. Lunched + home by 5:30 May 4, 1950 Left at noon with OP for Petaluma marshes. Set out a few line traps there near the hunt club (38 for me, 50 for OP) and drove over to Guerne. Arrived at Sidki's barn about 4 o'clock and found the bats mainly in two rather diffuse clusters near the ridgepole in the attic. We hung up nets & plugged all the holes we could find and think that only one Corynorhinus escaped us. We netted 73, all females, x moth pregnant. We