38 THE NAUTILUS. 
which the whorl rises abruptly, its rounded crest cut into rounded 
nodules like the joints of a millipede by deeply incised lines in har- 
mony with the lines of growth; there are about 38 of these divisions 
on the last whorl]; the incisions override the crest and extend nearly 
to the periphery, becoming gradually fainter ; periphery and base 
marked only by incremental lines, rounded, with a minute perforate 
umbilicus, over which a small portion of the inner lip is bent ; peri- 
stome thin, sharp, the body showing hardly any callus; max. diam. 
16, min. diam. 138, alt. 10 mm. 
This elegantly sculptured species seems to differ much from any 
yet described. Its nearest relatives are M. compluvialis Blanf., and 
M. convallata Benson, which have a channelled suture, but do not 
have the transverse sculpture cutting the crest of the enclosing 
whorls. The types are in the National Museum. 
ON A NEW HOLOSPIRA FROM TEXAS. 
BY. W. Ho eDALEL. 
Holospira (Haplostemma) Hamiltoni n. sp. 
Shell slender, polished, spindle-shaped, pinkish-white, with a 
darker livid apex, and about 13 whorls; nucleus blunt, smooth, 
later three whorls delicately obliquely striated, central whorls 
smooth, last whorl with delicate oblique riblets with wider inter- 
spaces ; aperture projected, rounded, subangular at the right poste- 
rior corner, the lip entire, reflected, the pillar rather wide; the last 
whorl flattened and attenuated. Lon. 19, max. diam. 5 mm. 
Collected in the Rio Grande Mts., Brewster Co., Texas, at a 
height of 3,500 feet, living on Sedaginella lepidophylla Spring, by 
Mr. James M. Hamilton, and presented to the National Museum 
through Dr. R. W. Shufeldt. 
This species is very much like H. (Metastoma) semistriata Stearns, 
externally, differing in its smaller and more slender shell and finer 
and more delicate sculpture of the later whorls near the aperture. 
QUARTER-DECKS AND JINGLES. 
BY ROBERT E. C. STEARNS. 
Several years ago, in the course of a conversation with Captain 
J. W. Collins, of the U. S. Fish Commission, relating to the various 
