1 1" 



rding to Mr. Melvill, is allied to D. eulimenes Melv. (Jovyn. of Mal. 

 \l, p. 84, PI. 8, fig. 15), hut different; the Siboga-shell is considerably ! nder, 



the < tcavation is much larger and the sculpture coarser. 



/'.'..; : mella clathurcllaeformis n. sp. PI. XXX, fig. 4. 

 Stal S., 128 l - Ceram-sea. 835 M. Blue mud. 



Shell elongately-fusiform, thin, transparent, white. Whorls about 9, <<( which about ;, 

 form a reddish-brown nucleus, composed of convex whorls, with riblets in different directions, but 

 nu. -leus being rather worn, tin- sculpture is not prominent. Subsequent whorls convex, with 

 a narrow vated part below the deep suture; the excavation is crossed by numerous, slightly 



curved, axial riblets. The convex pari of whorls is sculptured by strong, rounded, oblique, 

 axial rihs, 1 1 in number on last whorl, I by strong spirals, <> in number on penultimate 



whorl, "f which 4 are stronger and are esp'ecially prominent on the crest of axial rihs; these 

 rihs disappear on the base of last whorl, which, as well as the rather short canal is lirate. 

 Aperture o val, angular above, ending below in a rather narrow, slightly curved, compre 

 canal: peristome thin, with a narrow, shallow sinus above; columellar margin concave, with 

 a thin layer of enamel, directed to the left near the canal. 



Alt. S'/ v lat. 3 ; apert. alt. 3 1 /,, lat. 1 MUI. 



As the nucleus was not in perfect condition, the generic position seemed to be some- 

 what doubtful, hut the contrast in colour, between nucleus and rest of shell, the riblets below 

 the suture and other characters it has in common with the preceding species, have at last given 

 the n. 



6. P leurotomella extensaeformis n. sp. PI. XXX, fig. 5. 



Stat. 212. 5 54'. 5 S., 120 [q'.2 E. Banda-sea. 462 M. Fine grey and green mud. 1 Spec. 



Shell ovate, with short spire, rather strong, ivory-white. Whorls 8 or 9 (upper pari 

 eroded) of which 3 (or 4) form a reddish-brown, convexly-whorled nucleus, of which about 2 

 ilptured by slightly curved riblets, crossed in their lower part by fine, oblique 

 striae. Subsequent whorls scarcelj ated, the place of the excavation being occupied for a 



•_ r re.it deal by a rather strong, subsutural spiral, adorned by strong, laterally compressed beads, 

 22 in number on last whorl; below this spiral remains a rather large groove. Basal part of 

 whorls with narrow, a little oblique rihs, [5 in number on last whorl, ending below the groove 

 in short tubercles, which are connected by a second spiral; the space between the ribs is sculp- 

 tured by fine and co growth-lines and faint spiral striae, becoming stronger and groovelike 

 ds the of last whorl, and have the character of lirae on the short, large canal; last 

 whorl regularly convex, until the canal. Aperture oval, with a moderately sharp angle above 

 and a wide, slightly gutter-like canal below; peristome broken, probably with 3 very shallow 

 sinu^ growlh-lin< columellar margin with a thin layer of enamel, concave. Canal 

 dip left. 



. . apert. alt. 3, lat. 1 MUI. 



82 



