14 



7- Dentalium mintis n. sp. PI. VI, fig. 3. 



Stat. 319. 6° i6'.5 S., 114° 37' E. Java Sea. 82 Metres. Fine, yellowish grey mud. 2 Spec. 



Diagnosis. A markedly hexagonal shell, the ribs standing out like 

 fine marginating rods. Interstices flat, smooth with slight irregular growth-striae 

 only; no longitudinal sculpture, except the ribs. Shell substance rather fragile. 

 Anal orifice without notch or slit. Apex and anterior aperture hexagonal. Colour 

 Fig. 10. yellowish-white : 



Anterior aperture Length 33 mill., diameter of aperture 2,3 mill. 



of D. minus. ö O O ' V 'O 



b. Length 25 mill., diameter of aperture 2,1 mill. 



R e m a r k s. This elegant little hexagonal shell is smaller and more slender than D. 

 JiexagoHiiin. It has the size and curvature of the West- American D. neohexagotiiivi, but it is 

 easily distinguished by its fine marginating ribs, losing nothing in distinctness toward the 

 anterior aperture. 



D. Picteti^ a hexagonal shell of doubtful West-Indian locality cannot be identified with 

 our species. Deshayes in his description mentions that the interstices are alternately marked 

 with translucent and opaque white, while the posterior orifice is somewhat bi-labiate, two facts 

 which prove that the forms are distinct. 



8. Dentalium intercostatum n. sp. PI. VI, fig. 4. 



Stat. 178. 2°4o'S., 128° 37'. 5 E. Ceram Sea. 835 Metres. Blue mud. i Spec. 



Stat. 314. 7°36'S., 117° 30'. 8 E. Flores Sea. 694 Metres. Fine sandy mud. 2 Spec. 



Diagnosis. Shell strongly curved at the top, the rest nearly straight ; sculpture of six 

 or seven sharply-edged ribs; the interstices concave and smooth near the apex, 

 but becoming flat toward the anterior aperture, with many longitudinal threadlike 

 riblets; the number of threads in each interval varies between 5 and 8, some 

 times there are some finer ones between. Growth .striae clearly visible, crossing 

 Fig. II. the longitudinal threads, fut far less conspicuous than those. Apex entire star- 



Antenor aperture ghaped. Auterior aijerture hexagonal (or heptagonal), finely crenulated bv the 



of D. intercostatum. ^ ' t:> \ V f> J^ ) 



riblets, a little jagged from fracture. Colour white or yellowish white: 

 a. Length 30 mill., greatest diameter 2,7 mill. 

 l). Length 23 mill., greatest diameter 2,2 mill. 



*9. Deiitaliu7)i pseiidosexagonnin Deshayes. PI. I, fig. 10. 



1825. Dentalium pseiidosexagoiiuiii Deshayes, Mem. Soc. Hist. Nat. Paris, II, p. 358, pi. 16, 



fig. 14, 15, 16. 



1860. Dentalium psendosexagonum Deshayes. SOWERBY, Thes. Conch. III, p. 103, pi. 224, fig. 34. 



1872. Dentalium psendosexagonum Deshayes, Conch. Icon. 



1877. Dentalium psendosexagonum Deshayes. Brazier, Proc. Linn. Soc. N. S. Wales, II, p. 56. 



1897. Dentalium pseudosexagonum Deshayes. PlLSBRY & Sharp, Manual of Conch., vol. XVII, 



p. 23, pi. 4, figs 47, 48. 



