286 SUBEMARGINULA. 



inside. The anterior sinus is continued to the apex as a keel without 

 and a groove within the shell. 



Philippines. 



Tugali carinata A. AD., P. Z. S. 1851, p. 89. Tugalia carinata 

 SOWB., Thes., p. 221, f. 13. 



S. DECUSSATA A. Adams. PI. 43, fig. 88. 



Shell elongate-oval, whitish, planulate, back carinated ; elegantly 

 latticed with radiating riblets and elevated concentric lines ; vertex 

 acute, posterior ; margin of the aperture crenulated, sinuous in front, 

 sinus produced into a canal in front. With a regularly cancellated 

 sculpture and a keel from the anterior margin to the apex. (Ad.) 



Philippine Is. 



Tug. decussata A. AD. P. Z. S. 1851, p. 89, no. 10. SOWB. Thes., 

 p. 222, f. 12. 



S. CICATRICOSA A. Adams. PL 43, fig. 86. 



Shell elongate-oval, white, back much depressed ; decussated 

 with radiating riblets and concentric lines ; vertex subposterior, 

 depressed, excavated, quasi cicatricose, subpellucid , base arched ; 

 margin of aperture crenulated, front extremity sinuate, sinus pro- 

 duced in a canal within. The sinus and cicatrix as in T. cancellata, 

 but the shell flat and strongly cancellated. (Ad.) 



Philippines. 



Tug. cicatricosa AD., P. Z. S. 1851, p. 89, no. 7. SOWB., Thes. p. 

 222, f. 14. 



S. SCUTELLARIS A. Adams. PI. 43, figs. 81, 82. 



Elongate-oval, greenish-brown, thin, back planulate, vertex pos- 

 terior, acute, scarcely elevated; decussated with subdistant radia- 

 ting riblets and concentric lines of growth ; front end scarcely sinu- 

 ous ; aperture brown within ; edge crenulated. (Ad.) 



Bais, Philippines. 



Tug. scutellaris AD., P. Z. S. 1851, p. 89. Sows., Thes. p. 222, 



f. 8, 9. 



S. GIGAS Martens. PI. 43, figs. 76, 77. 



Shell oblong-obovate, moderately convex, concentrically rugose, 

 radiately costulate ; pale yellow ; in front narrowing, distinctly 

 emarginated, median rib wide, the rest smaller, close; posterior 



