1920.] NATURAL SCIENCES OF PHILADELPHIA. 313 



surmounted by a cinnamon line; 11 rounded ribs on the 

 last whorl, intervals with transverse impressions, 10 or 11 

 in intervals on penult whorl; 5 plaits, 25.3x8, aperture 



12 nun.; 10 whorls V. thaanumi n. sp. 



Fusiform, white with a chestnut band below the periphery 

 and few blackish-brown spots below the suture, apex dark 

 brown, 22 smooth axial ribs on last whorl with short, trans- 

 verse impressions in the intervals, 6 in each interval on 

 penult whorl; 2 spiral cords more prominent at base; 5 thin 



plaits. 18 X 7.5, aperture 8.4 mm.; 10 whorls 



V. xenium n. sp. 



Mitra kamehameha n. ?p. PI. XII, fig. 23. 



The shell is slender, fusiform, finely striate spirally. White, with 

 three series of ochaceous orange spots, subsutural, peripheral and 

 basal, the former with few spots. On the spire these spots are more 

 or less concrescent into longitudinal stripes. 



The last whorl has a broad swelUng behind the outer lip. The 

 aperture is more than half the total length, narrow. Outer lip is 

 rather thick, excavated within and becoming quite thin near the 

 upper insertion. There are six plaits, the lower ones small. 



Length 50, diameter 15, aperture 26 mm. Type. 



Length 40, diameter 12.7, aperture 22 mm. 



Honolulu Harbor, in the dredger dump. J. M. Ostergaard. 



This species is related to M. ustuJata Rve., but it differs by having 

 the aperture ^onger, more than half the total length, while in usiu- 

 lata it is less than half. The color is doubtless darker in living 

 specimens. 



Mitra thaanumiana n. sp. PI. XII, fig. 21. 



The shell is solid, fusiform. Outlines of spire and basal part 

 straight, periphery convex; cinnamon-brown, where the thin 

 cuticle is lacking, sayal brown, the apical whorls paler. Sculpture 

 of fine, well-spaced spiral striae marked with series of small punc- 

 tures, and separated by flat intervals; on the back of the penult 

 whorl there are 8 such spirals. The basal third of the last whorl 

 has coarser, deeper spirals and punctures, with convex intervals. 

 The aperture is clouded with cinnamon within. It Is widest in the 

 lower part, the lip being straight and abruptly contracted above. 

 There are six white plaits. 



Length 51, diameter 19, aperture 24.4 mm. Eight whorls (the 

 apex worn.) 



Hilo, Hawaii, D. Thaanum. 



