1904,] NATURAL SCIENCES OF PHILADELPHIA. 13 



showing only in an ill-defined median band and some pale streaks. 

 Sculpture of narrow spiral ridges parted by wider intervals, and alter- 

 nately smaller, the penultimate whorl with about 5 such primary 

 spirals, last whorl with about 17 primary or larger and an equal number 

 of smaller spirals (counted on the outer lip from suture to channel). 

 There are also some much finer spiral threads. Longitudinal sculp- 

 ture of rather wide-spaced grooves, cutting the spirals and intervals. 

 The larger spiral ridges are marked with a stippled or articulated line 

 of brown. Embryonic whorls wanting; subsequent whorls 7, convex, 

 the last tapering to the base. Aperture narrow, smooth inside; 

 columellar side nearly straight, with 5 plaits. 



Length 27, diam. 11 mm.; length of aperture 17 mm. 



Hirado, Hizen. Types Xo. 85,994, A. N. S. P., from Xo. 902 of 

 Mr. Hirase's collection. 



This species may be closely related to Mitra helvacea Phil. (Zeitschr. 

 /. Malak., 1851, p. 84), but that species has not been identified or 

 figured in more than half a century since its pubhcation, and the 

 description is not conclusive. M. pretiosa is a somewhat similar spe- 

 cies with a much larger spire. M. rufilirata A. and E,., Zool. "Scmia- 

 rang," Moll., p. 26, PI. 10, fig. 26, is also very closely related, but it 

 differs, apparently, in the more finely sculptured intervals between 

 the spiral cords. 

 Thala ogasawarana n. sp. PI. Ill, fig. 22. 



Shell very small, slender and fusiform, brown with a series of ill- 

 defined whitish spots at the periphery. Surface evenly cancellate, there 

 being about 6 spirals on the penultimate, 14 on the last whorl, crossed by 

 longitudinals of the same size and spacing; the lower 4 spirals nearly 

 continuous. Whorls 5^; sutiu-e rather superficial, rising a little, near 

 the aperture. Aperture about half the total length, narrow throughout 

 but sHghtly wider above. Outer lip thick, finely denticulate within, 

 with a shght sinus above. Columella with 4 strong, transverse plaits. 



Length 6, diam. 2 mm., aperture 3 mm. long. 



Chichijima, Ogasawara. Types Xo. 86,000, A. X. S. P.. from Xo. 

 1,436 of Mr. Hirase's collection. 



Few of the species of this genus have been adequately described 

 or illustrated. T. exilis (Rve.) seems related to this species. It is 

 more tapering anteriorly and "pale violet-purple." 



COLUMBELLID^. 

 Columbella turturina borealis n. subsp. 



Smaller and less inflated than typical turturina Lam., and with the 

 aperture narrower. Yellowish-chestnut-brown, with some bands of 



