84 DENTALIUM-FISSIDENTALIUM. 



" I am not quite certain as to the habitat of this curious niollusk ; 

 it was not among those dredged by Dr. Hungerford, but I believe 

 the three specimens were found in the neighborhood of Hong-Kong. 



" [Since the reading of this paper our President drew my atten- 

 tion to the fact that the Rev. R. Boog Watson, in his Report on the 

 Scaphopoda and Gasteropoda of the Challenger, p. 2, pi. 1, fig. lb, 

 noticed something on a very small scale approaching the character 

 here described in the case of a very young specimen of Dentalium 

 capillostcm Jeffreys. He says : " The young specimen from Station 

 78 has at the apex on the convex curve a slit O'l in. long, but inter- 

 rupted by two bridges of the shell which have not been removed 

 when the fissure was made.] " 



D. HUNGERFORDi Pilsbry & Sharp, n. n. PI. 6, fig. 83. 



Shell rather wide, almost straight, acute ; unequally compressed; 

 toward the apex slightly inclined. Tawny, irregularly banded with 

 brown. Sculptured with very numerous plano-convex unequal rib- 

 lets, and cancellated by but slightly conspicuous transverse striae. 

 Slit long and narrow. Aperture somewhat oval. Length 72, great- 

 est diam. 12 mill. (^Soivb.). 



Hong Kong (Hungerford). 



B. compressum Sowb., P. Z. S., 1888, p. 569, pi. 28, f. 18. Not D. 

 covvpressum Watson, 1879, nor of Meyer, nor of Orbigny. 



A very distinct and remarkable species, more highly colored than 

 its congeners; but it is chietiy distinguished by its curiously com- 

 pressed form. A second specimen, brought by Dr. Hungerford, is 

 only 62 millimeters in length, and rather wider in proportion. It 

 is rather lighter in color, but presents all the same characters, con- 

 firming the specific importance of the chief characteristic, which 

 might otherwise have been thought accidental (Sowb.). 



Apparently more tapering and more finely ribbed than the large, 

 compressed species of unknovvu origin described by Chenu as D. 

 gignnteum. 



D. CLATHRATUM von Marteus. Unfigured. 



Shell rather straight, elliptical in section, white, opaque, with 

 about 16 angular, narrow, equal ribs, with saialler ones sparsely in- 

 tercalated towards the aperture, the interstices conspicuously trans- 

 versely striated. Apical orifice thick-edged ; slit on the convex side, 

 narrow, long. Length 51, transverse diam. of aperture 4, dorso- 

 ventral diam. 3i mill., diam. of apex I mill. (Mart.). 



Near Moreton Bay, eastern Australia, 550 fms. (Gazelle Exped.J. 



