178 LOO CHOO MOLLUSK8. 



or most weakly unidentate above. Area flat, smooth, yellow, the 

 columellar edge with two slight submedian notches. Alt. 13, diam. 

 13 mm. 



Operculum flat, having a closely granulose band around the outer 

 edge, smooth or with very sparse granules in the middle and at 

 proximal end ; smoky or blackish-gray except at basal end which is 

 white, a paler streak extending up outer margin. Inside light yel- 

 lowish proximally, olivaceous distally ; flat, rather thin, becoming 

 slightly thicker toward straight margin, but the linear adhesion- 

 scar impressed ; spiral process long ; basal process rugose or striated. 



Yaeyama. 300 specimens. 



Differs from helicinoides and its synonym pellis-serpentis in the 

 completely smooth outer lip ; from affinis in the coloration, etc. 

 Nerita hindsii Reel * Yaeyama. 

 Nerita undata var. leguillouana Reel. Yaeyama. 

 Neritina ualanensis Less.* Yaeyama. 

 Neritina (Clithon) sowerbyana Reel. Tryon, Man. Vol. 10, p. 67, pi. 24, fig. 45 ; 



pi. 25, figs. 46-51. 



Yaeyama. 48 live shells with opercula. 



TURBINIDJE. 

 Turbo marmoratus Linn. Tryon, Man. Vol. 10, p. 191, pi. 4, fig. 23. 



Yaeyama. 12 fine large mature shells with opercula. Native 

 name, Yako-Gai. 



Turbo (Batillus) cornutui Gmel. (Typical). Tryon, Man. Vol. 10, p 210, pi. 43, 

 fig. 50. 



Kudaka Is. 22 live shells, some with opercula. 

 Turbo (Batillus) cornutus Gmel. (var.). 



Kudaka Is. 25 shells with opercula with but one row of tuber- 

 cles instead of two as in the type and of smaller size. 



Turbo parvulus Phil.* Yaeyama. 



Turbo (Senectus) argyrostomus Linn. Tryon, Man. Vol. 10, p. 197, pi. 40, fig. 18. 



Katsuren Jima. A var. with no elevated vaulted scales on line. 

 19 live shells with opercula, 9 no opercula ; also Kudaka Is. 47 

 live shells, small size, without vaulted scales on the lirse ; with and 

 without opercula ; also a var., Kudaka. 2 live shells, full-grown 

 and with opercula, without vaulted scales on the lirse. 

 Turbo imperialis Gml. Tryon, Man. Vol. 10, p. 192, pi. 43, fig. 53. 



Yaeyama. 2 fine mature shells with opercula, more highly nod- 

 ulated on the body whorl than in the figure. 



