Tue NautILus. 
Vou. XI. APRIL, 1898. No. 12. 
DESCRIPTIONS OF NEW AMERICAN LAND SHELLS. 
BY HENRY A. PILSBRY. 
Punctum clappi n. sp. 
Shell minute, openly umbilicated, yellowish-brown, with depressed, 
nearly level spire, and cylindroid whorls. Whorls 33, the earlier 
13 smoothish, finely pitted, the last 1 or 14 whorls sculptured with 
elevated lamin running with the increment-lines, 30 to over 40 on 
the last whorl, the intervals closely striated and showing fine spiral 
striation; suture impressed, descending in front; umbilicus deep 
and open, its width contained between 34 and 33 times in greatest 
diameter of shell. Aperture short oval, higher than wide, somewhat 
oblique, but little excised by the previous whorl. 
Alt. 1:1~1'2, greatest diam. 2 mm. 
Seattle (Randolph) and Tacoma (Hemphill), Washington ; Salem, 
Oregon (Hemphill). 
My attention was called to this form some years ago, but its de- 
termination at this time is due to Mr. George H. Clapp, who insist- 
ing that the shells were neither Punetum conspectum nor Pyramidula 
astericus, induced me to review the group. 
P. (Planogyra) asteriscus is even flatter above; the umbilicus is 
wider, one-third the diameter, and more open ; the cuticular lamelle 
are more widely spaced and fewer, 19-25 on the last whorl, and the 
aperture is relatively smaller. 
Punctum conspectum, which also occurs at Seattle, has a much 
more elevated spire, decidedly narrower umbilicus, less than one- 
fourth the diameter of the shell, and the aperture is different in 
shape, wider than high. 
