1 1 



4. DentaliiDii intcrstriatum Sowerby. PL I, fig. 4. PI. IV, fig. i. 



i860. Dcntaliuin interstriatuni Sowerby, Thes. Conch. Ill, p. 102, pi. 223, fig. 7. 



1872. De7italiian interstnatitm Sowerby, Conch. Icon. XVIII, pi. 2, fig. 10. 



1897. Dentalium interstriatiiin Sowerby. PiLSCRV & Sharp, Man. of Conch, vol. XVII, p. 4, 

 pi. I, fig- IS- 



Stat. 240. Banda. From 9 — 45 Metres. Black sand. Coral. 15 Spec. 



Diagnosis. Shell long, slender and well curved, the greatest diameter from about 

 one twelfth to one seventeenth the length. Sculpture : at and near the 

 apex 8 to 9 narrow ribs; a little lower, at a distance of about 10 — 15 mill, 

 from the apex, secondary riblets arise, making a total number of 16 to 

 18 equal rounded longitudinal ribs. Anteriorly the sculpture of different 

 specimens is subject to a great variability. In some specimens the 1 6 or Fig. 7. Anterior aperture 

 1 8 riblets remain consistent toward the anterior aperture, the intervals °^ ^- """''"">"""■ 

 either smooth or irregularly striate with small tertiary riblets, in others the secondary riblets 

 become more or less obsolete, while only the primary ones remain clearly visible toward the 

 end. Sculpture on the concave side stronger than on the convex side. Apex entire or with a 

 slight notch. Anterior aperture circular sometimes faintly laterally compressed. Colour yellowish 

 at the apex, fading to dark green toward the anterior aperture. 



a. Lenpth 80, grreatest diam. 6 mill. 



b. Length 65, greatest diam. 5,8 mill. 



Distribution. Bohol, Philippines, Amboina, Moluccas. 



Remarks. D. inter striahim resembles D. aprinum, but the sculpture is decidedly different. 



There are nine fine specimens in the Zool. Mus. of Amsterdam. All have the apex 

 entire, while of the 15 specimens obtained by the Siboga, two have a very slight notch. 



Sowerby's diagnosis is here given : 



"Shell strongly arcuate, green, narrow^ primary ribs about 10, with smaller ones in the 

 interstices; apex entire. Resembling D. aprinuin but with numerous interstitial striae". 



Mr. PiLSBRY having seen no authentic specimens of this species felt inclined to consider 

 it as a variety of D. aprinum. Under the name of D. Letsonae he described a new species, 

 which after the description greatly resembles some specimens of D. interstriahim. To my great 

 regret I was not in the opportunity of comparing both species, and therefore dare not say 

 whether they can be identified. 



*5. Dentalium Letsonae Sharp & Pilsbry. PI. I, fig. 5. 



1S97. Dentalium Letsonae Pilsbry & Sharp, Manual of Conch, vol. XVII, p. 4, pi. i, fig. 13, 

 pi. 5, figs 66, 67, 68. 



Diagnosis. Shell long and slender, the length about 12 times greatest diameter, solid, 

 but rather thin, well and equally curved; pale green, with numerous indistinctly defined darker 



