ALECTIUON. 29 



This species is, typic:illy, readily distinguished 1'rom i\ r . hirta, 

 but appears to approach the latter through varieties. The 

 oldest name given to it is possibly N. hepah'cn, Mont., wh 

 nred a similar species in error as British, but it is well known as 

 monile, and no useful purpose will be subserved iii'Nchangm"; its 

 name. N. lachrywu&a, Reeve (rig-. 62) and X. ptnipcrafa^ (J,uoy 

 = N. bullata, Marr. (tig. 61), are synonyms, and N. Jarkso nianti, 

 Quoy (figs. 63, 64) is a dwarf race, from Australia a, well- 

 marked variety. N. mucronata, A. Ad. (fig. 67), is a variety in 

 which the ribs are partially separated into granules, ami X. dix- 

 torta, A. Ad. (fig. 68), is a monstrosity, apparently of this 

 species. N. corticafa, A. Ad. (fig. 66), appears to var. Jar/,- 

 soniana, as docs also* X. acufico$tata : Montr, (fig. 65), and A'. 

 Taxman ira.. Woods (nnfigured). 



X. OBESA, G. and II. Nevill. 



Shell thick, shining; brown indistinctly and minutely mottle<l 

 with white, irregularly stained near the suture wit.li a, darker 

 shade of brown; two rows of more or less granulose ridges 

 immediately beneath the suture, columella with a moderately 

 large, white callosity, slightly rugose, aperture ridged near its 



margin. Length, 22 mill. 



'ch. 

 Yar. CEYLONICA, G. and II. Xevill. 



More acuminate, less globose, suture more distinct; longi- 

 tudinal ribs on the antepenultimate whorl more or less obsolete. 



Length, 19 mill. 



Ceylon and Pcnany. 



Has the coloration but not the fragility of N. iimhilrilix, di tier- 

 ing also in being sculptured. Thickness, sculpture, and particu- 

 larly the double row of granules beneath the suture indicate 

 intimate relationship with N. monile. 



X. scALAKis, A. Ad. PI. II, figs. 69, 70. 



Pale yellowish, obscurely banded with reddish brown. 

 Length, 1-3 inches. 



Isle of Corrigidor, Philippines, in coarse sand at seven 



fathoms. Ou m i n< . 



Appears to partake of the characters of A", monile and N. 

 papillosa. N. crenidata, Kiener, not Brug. (fig. 70), and N. cren- 

 ellifera, A. Ad. (fig. 75), seem to be the same species. 





