SCUTUS. 287 



broadly rounded, having wide, subnodose, distant ribs ; summit at 

 the posterior f of the length. Inside white, shining. 

 Length 89, breadth 55, alt. 22 mill. (Mis.) 



Northern Japan. 



Subemarginula gigas MARTENS, Conchol. Mittheil. ii, p. 103, t. 

 19, Dec. 1, 1881. 



This gigantic species is readily known from all others. It is 

 called Saru-aivabi by the Japanese, who capture and eat them the 

 entire year. 



Unfigured and undetermined species of Tugalia. 



TUGALIA OSSEA (" Gould ") A. Adams. PL 43, fig. 87. 



This form is figured in Sowerby's Thesaurus, iii, pi. 249, f. 18. 

 It is identified by Adams with Emarginula ossea Gould, with which 

 it has absolutely nothing to do. It may be regarded as a lost spe- 

 cies, and the name must in any case be abandoned, as Gould's ossea 

 is a Subemarginula. 



TUGALI RADIATA A. Adams. Shell elongate-oval, yellowish, much 

 depressed; ornamented with rounded, a little elevated, distant, 

 radiating ribs and concentric striae ; aperture whitish within, mar- 

 gin crenulated, front end scarcely sinuate. (Ad.) 



Catanuan, Philippines. 

 T. radiata ADAMS, P. Z. S. 1851, p. 89, no. 9. 



TUGALIA OBLONGA Pease (P. Z. S. 1860, p. 437.)- 



Sandwich, Is. 

 TIGALIA TASMANICA Tenison- Woods. Unfigured. 



N.-E. coast of Tasmania. 



T. tasmaniea T.-Wooi>s, Proc. Roy. Soc. Tasm. 1876,~p. 156, 

 (1877.). 



Genus SCUTUS Montfort, 1810. 



Scutus MONTF. Conch. Syst. ii, p. 58, 59. Type S. antipodes 

 Montf ambiguus Chemn. Parmophorus BLAINVILLE, Bull. Sci. 

 Soc. Phil. 1817, p. 25. Scutum of some authors. 



The shell is oblong, depressed, apex directed backward ; no anal 

 groove or slit, but the front margin more or less truncated and 

 sinuous; surface without radiating sculpture; anterior ends of the 



