1904.] NATURAL SCIENCES OP PHILADELPHIA. 9 



Pse.; but it is noticeably wider than that, with a more ample aperture 

 and entirely different coloration. 



Mangilia pura n. sp. PI. II, figs. 15, 15a. 



Shell fusiform, rather thin, cream-white, indistinctly stained wdth 

 brown in some places below the suture. Sculpture of curved, sHghtly 

 sinuous, rounded longitudinal ribs, slightly narrow^er than their con- 

 cave intervals, and about 21 in number on the last whorl; the last rib 

 much larger, forming a stout lip-varix. These are crossed by many 

 spaced spiral threads passing over ribs and intervals, and about 30 

 in number on the last whorl. The intervals between these threads 

 are sometimes divided by a secondary threadlet ; and there is through- 

 out a very minute, even and regular granulation produced by the inter- 

 section of spiral and longitudinal striae . Whorls about 8, the first 

 two rounded, and Avith delicate spaced costulae, forming a trochoidal 

 nucleus; the last whorl slightly ascending in front. Aperture long and 

 narrow, obtuse at the ends, smooth within, slightly retracted above. 



Length 13, diam. 4.7 mm. ; length of aperture 7.7 mm. 



Length 9.8, diam. 3.8 mm. 



Hirado, Hizen. Types No. 85,974, A. N. S. P., from No. 1,527 of 

 Mr. Hirase's collection. 



This species seems to be similar to M. cylindnca Reeve, but that 

 shell is more slender. 

 Mangilia semicarinata n. sp. PI. II, figs. 16, 16a. 



Shell fusiform-turrit e, white with some brown stains beloAv the suture 

 and a brown spot at the middle of the lip-varix; rather thin. Sculp- 

 ture of many slightlj^ oblique and arcuate longitudinal riblets about 

 as wide as their inter^-als, and sixteen in number on the last whorl. 

 These are crossed by spaced spiral threads, about 18 from the shoulder 

 down on the last whorl, a little widened where they pass over the rib- 

 lets. The spaces between the threads and above the shoulder are 

 very finely striate spirally. Whorls 7, the first 1^ rounded, radially 

 weakly costulate, several whorls following convex, rounded, the last 

 2 or 3 whorls angular at the shoulder. The last whoii bears a narrow, 

 elevated, arcuate lip-varix. Aperture narrow, both lips slightly arcu- 

 ate; blunt at the ends, smooth within. Anal sinus rather deep and 

 rounded, the varix curving back of it. 



Length 7, diam. 2.7 mm.; length of aperture 2.7 mm. 



Hirado, Hizen. Types No. 86,124, A. N. S. P., from No. 1,520 of 

 Mr. Hirase's collection. 



