310 PROCEEDINGS OF THE ACADEMY OF [Nov., 



4. Weakly, irregularly plicate, with coarse punctures in spiral 



and axial series 5 



Not plicate; fine punctures in spiral series, often obsolete at 

 periphery; a ragged or blotched white band near the suture 



and usually other white spots, on a dark ground. 



M. coronata aurora Dohrn. 



5. Chocolate, with a white band bordering the suture 



M. luguhis Sw. 

 A narrow whitish band a short distance below the suture, 



white sutural tubercles. Honolulu 



M. lugubris honoluluensis n. subsp. 



6. Spire and upper part of last whorl finely axially costulate, 



with spiral punctured lines 7 



Spire spirally striate, not distinctly costulate .9 



7. Aperture f or more of the total length; spire short; yellow 



(or white) with dark apex and basal spot 8 



Aperture less than f of the length, spire moderately long; 

 white with a dark brown median belt M. newcombi Pse. 



8. Last whorl sculptured only at the upper part. 



M. olivaeformis Sw. 

 Last whorl having spaced, closely punctate spiral lines through- 

 out, otherwise similar to the preceding. 



M. olivellaeformis n. sp. 



9. Fusiform, the aperture half the length or less 10 



Pupiform, with shorter spire and longer aperture 14 



10. Small species, less than 18 mm. long 12 



Larger or large species, about 20-50 mm. long 13 



12. White, smooth, with two wide orange zones; about 14 mm. 



long M. micans Rve. 



White; minutely striate spirally, 7-8 mm. long. 



M. alba Pse. 



13. Uniform cinnamon-brown; outlines rather straight above and 



below the convex periphery, sculpture of punctate spiral 

 lines, ,8 on penult whorl, weaker in the peripheral region; 

 outer lip contracting above, with crenulate edge, but with- 

 out any internal tubercle or callus; 6 plaits. 51 x 19, aper- 

 ture 24.4 mm., 8 whorls M. thaanumiana n. sp. 



Similar to the preceding, but the last whorl is somewhat flat- 

 tened peripherally; there are 6 punctured lines on penult 

 whorl; irregular crenulations below the suture; 5 plaits. 



43 X 15, aperture 22.3 mm. Orange (faded) ; Honolulu 



M. ostergaardi n. sp. 



Olivaceous or dusky, with widely spaced dark spiral lines; 



outer lip thickened or with a tubercle within 



M. astricta Rve. 



14. Speckled with buff on a dark ground M. Htterata Lam. 



Chocolate, with a pale shoulder band M. auriculoides Rve. 



Uniform dark brown 15 



