DENTALIUM-GRAPTACME. 93 



Mazatlan, off Modiola capax, Chamce and Spondyli, very rare. 

 Liverpool Coll. Tablet 879 contains the perfect specimen, a small 

 one wedged in the mouth of Trivia sangidnea, and a fragment of a 

 large one, '065 [:== r625 mill.] across {Carpenter). 



Carpenter, who described a good deal of trash as well as many- 

 good species in the Mazatlan Catalogue, makes a wrong identifica- 

 tion of D. hyalinum Phil., and redescribes its young as above. 



D. AcicuLUM Gould. PI. 17, figs. 65, 66, 67. 



Shell slender, considerably tapering, attenuated posteriorly, mod- 

 erately curved throughout but more toward the apex ; glossy white, 

 nearly opaque. Sculpture of fine, dose, deeply engraved longitudi- 

 nal strice near the apex (extending over only a seventh the total 

 length in the type specimen), the remainder of the shell smooth and 

 polished, with faint growth-strite only. Aperture circular, a trifle 

 oblique. Anal orifice with a slight notch on the convex side (fig. 

 67) and a concave wave on the opposite part. Length 24, diam. at 

 aperture 2*55, at apex 0"6 mill. 



Coast of &hina, 23° 50' N. lat., in 25 fras, sand (Stirapson). 



D. aciculmn Gld., Proc. Bost. Soc. N. H., vii, p. 165 (1859) ; Otia 

 Conch., p. 119.— SowB., Conch. Icon.,xviii, pi. 7, f. 52 (1872). 



? Z). semi2)olitum Cooke, Ann. Mag. N. H. (5), xvi, 1885, p. 273. 

 —Smith, Ann. Mag. N. H. (4), xvi, 1875, p. 113. 



Compared with D. semipolitum from the Gulf of California the 

 type of D. aciculum is striated for a much shorter distance, increases 

 slightly less in calibre, and is distinctly notched at apex. Whether 

 these differences are specific or merely individual we have not 

 enough Oriental material to decide. Probably Cooke's semipolitum 

 from the Gulf of Suez (MacAndrew !) and Smith's from Cape 

 Shima and Matoza Harbor, Japan, 6-18 fms. (St. John !) are Gould's 

 form, rather than the true semipolitum. 



The description and figures are from the type. No. 14149, U. S. 

 Nat. Mus. 



D. NOV^EHOLLANDi.E Chcnu. PI. 17, fig. 64. 



Shell subarcuate, whitish, smooth anteriorly, with very minute 

 striffi on the posterior third. A species of large size, white, glossy, 

 remarkable for the fine striation of the upper (smaller) end, while 

 the larger portion is smooth with faint growthstrise only (Chenu). 

 Length 76, diam. of aperture 4*2 mill, (from fig.). 



Australia (Chenu). 



