14 DENTALIUM. 



D. strigatum GLI>., Proc. Bost. Soc. N. H., vii, p. 166 (1859); 

 Otia, p. 119. 



Considerably like D. bisexangulatum on a small scale, but the 

 concave intervals and sides of the ribs are finely and evenly striated 

 longitudinally as in D. lineolatum. Figures and description from 

 one of the original specimens, in U. S. Nat. Mus. (no. 24189). 

 D. BUCCINULUM Gould. PI. 5, figs. 74, 75, 76 ; pi. 6, fig. 84. 



Shell rather rapidly tapering, solid, the smaller half considerably 

 curved, later half straight ; lusterless, white. Sculpture of 14 nar- 

 row, rather sharp ribs at the smaller end, separated by wider, deeply 

 concave intervals ; at the middle of the shell a thread arises in each 

 interval, those on the convex side appearing first, and at the aperture 

 there are 28 equal riblets parted by shallow intervals as wide as 

 themselves. Aperture oblique, circular. Anal orifice small, ovate, 

 with an extremely slight notch on the convex side. Length 16, 

 diarn. at aperture 2*2, at apex 0'7 mill. 



Kagosima, Japan (N. Pacif. Expl. Exp.). 



D. buccinulum OLD., Proc. Bost. Soc. N. H. vii, p. 166 (1859) ; 

 Otia, p. 119. SOWB., Conch. Icon., xviii, pi. 7, f. 50. 



The specimen described above and figured on pi. 5 is not full 

 grown. Traces of tertiary threads at the aperture show that a 

 larger shell would have more riblets. It is no. 24160 U. S. Nat. 

 Mus. Gould's description here follows : 



Shell moderate, milk white, ruddy toward the apex, very arcuate ; 

 longitudinally grooved by about 30 sulci, which vanish toward the 

 aperture. Length 30, diam. 3 mill. Most nearly allied to D. cur- 

 ium, but is more deeply grooved. (Gld.~). 



Sowerby quotes this and Gould's other species, as MSS. names in 

 the British Museum ; but they were all diagnosed by Gould many 

 years ago in as well-known a work as the Otia Conchologica. The 

 locality " Hong Kong " given in the Iconica is incorrect. 



D. CURTUM Sowerby. PI. 10, fig. 65. 



Shell greenish, subcylindrical, delicately striated, short. Apex 

 obtuse, slightly fissured. A small, cylindrical, pale-greenish shell, 

 with obtuse apex and fine striae. (Sowb.}. Length 20J, diam. 3 

 mill, (from fig.). 



Habitat unknown. 



