SWATNSONIA. 131 



M. OLIV^EFORMIS, Swainson. PL 38, fig. 131 ; PI. 33, fig. 28. 



Whorls encircled by punctate incised lines, which are usually 

 obsolete except around the upper part ; yellowish or orange, 

 apex and base dark blue-black. Length, '65 inch. 



Society Islands, gregarious, in sand inside the reefs. 



M. dactyloidea, Anton (fig. 28), appears to be a young shell of 

 this species. 



M. FORMOSA, Pease. PI. 38, fig. 128. 



Smooth, polished, transversely regularly punctate-striate ; 

 light flesh-color, spotted or striped longitudinally with white, 



aperture yellowish. Length, 14 mill. 



Ascension Isl. 

 Allied to M. filum, Wood. 



M. NEWOOMBII, Pease. 



Shell elongate, rather cylindrically fusiform ; spire short, acute ; 

 whorls flatly convex, transversely punctate-striate, striae becom- 

 ing sometimes obsolete on middle of last whorl ; spire and upper 

 part of last whorl decussated by longitudinal impressed striae ; 

 base distantly grooved and somewhat truncate ; columella five- 

 plaited, white, remotely punctured with reddish brown dots, last 

 whorl encircled with a broad dark brown band. 



Length 27, diam. 8 mill. 



Sandwich Isles. 



Allied to M. filum, Wood, but somewhat larger. It is un- 

 figured, and I have not seen a specimen, but I suspect that it is 

 a variety of that species. 



M. FISSURATA, Lam. PI. 38, figs. 124, 125. 



Smooth, polished, sometimes partly or wholly encircled with 

 distant, slightly impressed revolving lines ; pale pink-gray, with 

 a broad obscure darker band, overlaid with a china-crackle pat- 

 tern of white lines ; sometimes the band is bordered above by 

 brown ocelli, visible above the suture-line of the spire; livid 

 within the aperture. Length, 1-2 inches. 



Red Sea ; Mauritius ; Zanzibar. 



M. ocellata, Swainson (fig. 125), is the shell with the dark 

 spots ; it is not a distinct variety as these may be detected ob- 

 scurely marked on most specimens, and occasionally become 

 more or less prominent. 



