380 PlKKKKDINdS OF THE NATIONAL MUSEUM. vol. xxx. 



fall a little aiitcrioi' to the peripheral termination of the depressed 

 intercostal spaces and leave a very narrow smooth band apparent in 

 the suture. Base of the last whorl \erv short, slijuj-htlv I'ounded, with 

 a small depressed area at the columella. Aperture sul)(|uadrate, mod- 

 erately laro-e, posterior anole obtuse, outer lip thin, showing the 

 external sculpture within h\ transmitted light; columella short, 

 straight, and slightly revolute, with a weak, deep seated, obliciue fold 

 near its insertion, which is not apparent in the aperture when this is 

 viewed s<piarely. 



The type comes from Japan, has tiftcen post-nuclear whorls and 

 measures: long. 11.5 mm.; diam. 2.8 mm. 



TURBONILLA { CHEMNITZIA ) DUNKERI Clessin. 



Plate XX, fig. ;i 



Ihirbonilla dtmkeri Clessin, Mart. Chem. Conch. Cab., 2d ed., Pyrani., 1900, 

 p. 257, pi. -XLi, fig. 3. 



Shell elongate-conic, gently tapering, d'lviy white. Nuclear whorls 

 three, small, decidedly elevated, very loosely coiled, having their axis 

 at a right angle to the axis of the later whorls and scarcely at all im- 

 mersed in the first of them. Post-nuclear whorls very slightly rounded, 

 almost flattened in the middle between the sutures, rather high, marked 

 by strong, rounded, oblique axial ribs which extend prominently from 

 the sunnnit of the whorls to the periphery. Intercostal spaces about 

 as wide as the ribs, decidedh' depressed, extending from the sunnnit 

 to the periphery, where they suddenly terminate. Twelve axial ril)s 

 are present on the tirst, sixteen on the fifth, and twenty-one on the 

 penultimate whorl. These ribs are not at all fused at the sununit of 

 the whorls, but remain distinct. At the periphery, however, they do 

 become fused and terminate the depressed interspaces. Sutures sub- 

 channeled. P(n-iphery of the last whorl slightly angulated. Rase 

 moderately long and genth' rounded. Aperture small, subquadrate, 

 posterior angle obtuse, outer lip thin, columella slender, slightly 

 curved and somewhat revolute, having a weak, very obrKjue, deep- 

 seated fold near its insertion, which is not visible in the aperture when 

 this is viewed squarely. 



There are three specimens in the Dunkei- collection, Clessin's t^'pes; 

 they are from Nagasaki, fJa})an. The largest one of these, the one 

 above described, has elev(Mi post-nuclear whorls and minisures: long. 

 <i.2 mm.; diam. 1.6 mm. The smallest one agn^eing in every way 

 with the larger specimen, has nine post- nuclear whorls and measures: 

 long, -t.2 nun.; diam. 1.2 nun. 



Clessin's figure of this .species is .so poor that it not oidy fails in 

 delineating the characters of the species, hut is absolutely misleading. 



