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

 p. 222, f. 12. 



S. CICATRICOSA A. Adams. PI. 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.} 



JBais, Philippines. 



Tug. scutellaris AD., P. Z. S. 1851, p. 89. SOWB., 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 



