NO. 1452. NOTES ON PYRAMIDELLID.E—DALL AND BARTSCH. 843 



and depressed spiral l)aiKls between the sutures, the raised bands are 

 usually a little wider than the depressions, are spirally striated, and 

 show here and there a tendency to bifurcation. Nine depressed areas 

 are present upon the second, eleven upon the fifth, and the penult 

 whorl, the posterior two of which are situated upon the shoulder and 

 are less strongly developed than tho rest. Periphery and base of the 

 last whorl well roiuided, the latter somewhat produced, and sculptured 

 like the spaces between the sutures, by the axial ribs, which extend 

 quite prominently to the umbilicus and ten spiral raised and depressed 

 bands. Aperture large, oval, outer lip thin, showing* live deep-seated, 

 interrupted, spiral lirations, the posterior ones of which are stronger 

 and more distantly spaced; columella slender, revolute, curved, pro- 

 vided with a quite prominent fold near the insertion; parietal wall 

 covered by a quite strong callus. 



The specimen described belongs to the Dunker collection and comes 

 from Nagasaki, Japan. It has eight post-nuclear whorls, and measures: 

 long. 6.7 mm.; diam. 'j.2 mm. There are two other specimens with 

 this, one of which served for the description of the nucleus, which is 

 lost in the t3'pe. Two other lots, both from Nagasaki, Japan, contain 

 two and three specimens, respectivel}'. 



In some individuals the ribs are somewhat thickened at the anterior 

 end of the shoulder and give this part a crenulated appearance; the 

 width of the raised, spiral areas is also narrower in some individuals 

 than the depressed areas. 



TURBONILLA (PYRGISCUS) MUMIA A. Adams. 



Plate XVII, fig. 1. 



ChrysalUda mumia A. Adams, Ann. Mag. Nat. Hist., VII, 1861, p. 45; not Chem- 

 nitzia muinia Stopani, 1858, which is not a Pyraniidellid. 



Shell elongate-conic, small, white. Nuclear whorls three, moderatelj' 

 large, helicoid, having their axis at a right angle to the axis of the 

 later whorls and about one-third immersed in the first of them. Post- 

 nuclear whorls slightl}^ rounded, almost flattened, shouldered at the 

 summit with strong rounded axial ribs which render the summits of 

 the whorls subcrenulate. There are fourteen of these ribs on the tirst, 

 twenty on the fifth, and twenty-two on the penultimate whorl. Inter- 

 costal spaces about as wide as the ribs, crossed by a slender equal 

 and equally spaced raised spiral threads, of which there are eight on 

 the fourth and ten on the penultimate whorl between the sutures. 

 Periphery of the last whorl somewhat angulated. Base attenuated, 

 sculptured like the spaces between the sutures, by the axial rilis and 

 ten spiral threads. Aperture rather small, outer lip (fractured) show- 

 ing the external markings within, columella somewhat obli(|ue, straight, 

 revolute, with a fold near its insertion which would scarcely be visible 

 in a specimen with a perfect aperture. 



