138 CANCII.LA. 



M. FORMOSA, A. Ad. PI. 39, fig. 103. 



Whitish, clouded with chestnut ; slightly round-shouldered. 



Length, 1*4 inches. 



Moluccas. 



I have not seen either this or the preceding species : the 

 figures look much alike, and the diflerence in coloring is of little 

 account, but M. formosa appears to have finer sculpture. 



Section Cancilla, Swainson. 



Shell fusiform, slender ; with revolving, linear, elevated ridges, 

 and no longitudinal ribs; outer lip thin, jiot dentate within. 



M. PILARIS, Linn. PL 40, figs. 1^4-176, 180. 



Pinkish white or yellowish white, with elevated, narrow, brown, 

 beaded ridges. Length, l-25-l'75 inches. 



31ay,7'itius, Philippines, Polynesia. 



Mr. Garrett considers 31. nexilis, Martyn, a distinct species ; 

 it is a shorter, stouter form than the tj'pe, but intermediate con- 

 ditions are not wanting. Philippi considers M. Jilosa, Born 

 (z= Jilaris, L.), the equivalent of the obese form, and makes of 

 the narrow form a var. gracilis^ whilst a small race is designated 

 as var. Bernardiana. 



Yar. NEXiLis, Martyn. Fig. 174. 

 Yar. Bernardiana, Phil. Fig. 180. 

 Yar. circulata, Kiener. Fig. 176. 



The ridges are uncolored, sharper, devoid of granules ; in 

 some specimens the intermediate revolving strise are most prom- 

 inent, others are cancellated between the ridges, and others again 

 show mostly the longitudinal inter-costal striae. M. circulata 

 has usually been considered a distinct species, but even in the 

 coloring of the ribs there is a gradual change from the uncolored 

 typical M. circulata to the full-colored M. filaris. 



M. CREBRILINEATA, Sowb. PI, 40, fig. 170. 



This little shell resembles filom ( = filar^is), but is narrower, 

 and has more numerous and finely beaded ridges. Length, -8 inch. 



Mauritius. 



Probably not distinct from filaris., but I have not seen a 

 specimen. 



