86 PTERONOTUS. 



M. ALABASTER, Reeve. PI. 41, fig. 529. 



Shell ivory-white. Length, 5 *5 inches. 



Philippines. 

 Only a single specimen known. 



M. CANALIFERUS, Sowb. PI. 40, figs. 519, 524, 510. 



White. Length, 1 inch. 



Hab. unknown. 

 M. cancellatus, Sowb. (fig. 510), is a synonym. 



b. With one nodule between the varices. 

 M. LINGUA, Dillw. PI. 40, figs. 513, 518. 



White, more or less stained with brown. Length, 1*5-2 inches. 



W. G. Africa. 



M.flamdux. Jousseaume (fig. 518), of which a single dilapidated 

 specimen is known, appears to me to be a synonym. Jousseaume's 

 figure is named on the plate M. rusticusa, name preoccupied by 

 Reeve, and therefore changed in his text to M. flavidus. 



M. HEMITRTPTERUS, Lam. PI. 40, fig. 516. 



The whorls are sloping!} 7 shouldered, below which they are 

 gradually attenuated to the end of the canal, and the varices are 

 not so broadly fimbriated as in the preceding species. It is very 

 probable, however, that it will prove to be only a variety of M. 

 iuujmi. Length, 1/5 inches. 



Senegambia. 

 M. ABYSSicoLA, Crosse. PL 40, fig. 520. 



This little shell is finely decussated by growth and revolving 

 lines, and has a single prominent tubercle between the varices. 

 Pale brown, with a light chestnut revolving band. Length, 11 



mill. 



Guadeloupe, W. I. 



Obtained by coral fishers at a depth of 500 metres. 



Its resemblance to M. lingua is very close, and it may be re- 

 marked in this connection that many species of the Western 

 Coast of Africa extend their range to the West Indies. 



M. ADAMSI, Kobelt. PL 40, fig. 514. 



Light yellowish or white, with a single rib between the varices. 



Length, 30 mill. 



West Indies. 



