58 THE NAUTILUS. 



ing to a narrow truncation above; thin, pale corneous, profusely 

 variegated with cream-white and having pale brown streaks. Sur- 

 face glossy, sculptured with rather strong and oblique sinuous riblets, 

 separated by wide intervals; suture subcrenulate. Whorls 12-15, 

 somewhat convex, the last free in a moderately long descending 

 curved neck. Aperture subcircular, a little oblique, the peristome 

 white, sometimes brownish below, expanded and somewhat reflexed 

 throughout. Axis encircled by a thread-like lamella, spinose in the 

 median and upper whorls, and a low spiral cord above it ; in the last 

 two whorls the axis is simple and sinuous. 



Long. 17, diam. 2.8, ap. diam, 2.3, whorls 14^. 



Long. 13.8, diam. 2.2, whorls 13^. 



Central Cuba : On stones at the Sierra de Matahambre y Tati- 

 bonico, and Veredas de Aguada y del Chorreron, in the mountains 

 near Las Llanadas, district of Mayajigua, in the Province of Santa 

 Clara. 



Related to U. contentiosa Ar., but differs by its sinuous and more 

 widely spaced riblets and by the free and descending last whorl. 



JJrocoptis bacillaris exilis n. var. Plate vi, fig. 10. 



Smaller than typical bacillaris; slenderly fusiform, often entire, 

 the upper two-thirds conspicuously attenuate to the bulbous apex, 

 the lower part somewhat swollen ; paler, variegated colored, sculp- 

 tured with oblique and sinuous thread-like riblets, suture subcrenu- 

 lated. Whorls 22-24 in the entire shell, 12-13 in the truncated 

 specimens, a little convex. Axis twisted and encircled by a delicate 

 spiral thread, spinose above. 



Long. 14.7, diam. 2.1. 



Central Cuba : On stones at Vereda le los Negros, a road between 

 La Legua and Tatibonico, district of Mayajigua in the province of 

 Santa Clara, 



NOTE ON THE GENUS SEPTA PERRY (TRITON ATICT.). 



BY WM. H. DALL. 



A recent article in the Victorian Naturalist (Australia) by Messrs. 

 Mathews and Iredale, on the hitherto unnoticed Arcana of George 

 Perry, shows that another change is necessary in the nomenclature 

 of this genus. It appeared that although Perry states in his " Con- 



