THE NAUTILUS. 79 



aperture, no spiral striation, and is smaller. P. fieldii Try on 

 is a much smaller shell without spiral lines, and higher relative 

 to its diameter. 



Probably all of this group should be regarded as toothless 

 forms of Planorbida. 



GUATEMALAN NOTES. 



BY A. A. HINKLEY. 



Coelocentrum yigas Von Martens, identified by Dr. H. A. 

 Pilsbry as a dark variety, 1 is the largest land shell the writer 

 ever had the pleasure of hunting. On Feb. 20. 1913, the first 

 dead specimen was found !>y a large log in a banana field. 

 Probably an hour was spent searching for a live one but with- 

 out success. Leaving the banana field, I followed up a branch 

 of the Cavech River to where it issued from the mountain side. 

 The labor of working through jungle and over rocks was re- 

 warded by finding the finest specimens of Pachycheilus indionnn 

 which I secured. From here the return was around the side of 

 another mountain, heavily wooded; on this mountain 5 living 

 C. gigas were found. This was considered a great find. 



The next day another place was visited beyond the mouth of 

 the Cavech River to where the mountain came out to the shore 

 of the gulf. After working through the thick undergrowth at 

 the foot of a mountain, the vegetation was more open, making 

 it easier to climb up or down. The first shell found was a fine 

 C. giyas in the act of depositing eggs in a round pit about f of 

 an inch across, and probably a half-inch deep, scooped out of 

 the mellow earth and containing 35 to 40 eggs. 



The best part of the day was spent on this mountain, looking 

 for these shells, of which 19 were secured. They were nearly 

 always partly covered with leaves. No more nests of eggs were 

 found, but others were seen which had been destroyed by some 

 enemy. 



1 The specimens are not " yellowish gray," as von Martens described it, 

 but between walnnt brown and burnt umber. 



