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- 

 stouie thin, sharp, the body showing hardly any callus ; max. diam. 

 16, min. diam. 13, alt. 10 mm. 



This elegantly sculptured species seems to differ much from any 

 yet described. Its nearest relatives are M. compluvialis Blanf., and 

 M. conval/ata 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. H. BALL. 



Holospira (Haplostemma) Hamilton! 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 Selaginella 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 



