168 
varying from 13 to 56m. The specimens, even those from the same station, often show 
considerable differences in colour; most of the specimens are small, and some of them at 
least may not be full-grown. I think it will be best to give short descriptions of the 
different sets. 
I. Stat. 2. March 8, 1899. Lat. 7° 25’S., Long. 113° 16’ E. Depth 56 m. Bottom: grey mud 
with some Radiolaria. Madura-strait. Half a dozen specimens attached to the 
shell of a Gastropodous mollusc. 
Small specimens: greatest diameter of the basis of the largest specimen 5 mm., shell 
conical, greatest diameter of orifice 2.5 mm. Radii not very broad, with the summits very 
oblique. Colour dirty white, with reddish tinted longitudinal bands crossed by greyish horizontal 
stripes. Radii with distinctly reddish horizontal stripes on a lighter underground. 
The scutum has prominent growth-ridges, finely and not very distinctly beaded. The 
adductor ridge is not very strongly developed. 
The tergum has a moderately broad spur with a longitudinal depression, not a deep 
furrow. The two portions of the basal margin, on the opposite sides of the spur, lie in a 
nearly straight line. Basi-scutal angle sharp, spur scarcely extending beyond the basal margin, 
and the extremity not sharply pointed. Internally the articular ridge is prominent; the crests 
for the depressor muscles only feebly developed. 
This set corresponds in several characters to Darwin’s var. (1) communes. 
II. Stat. 50. April 16/18, 1899. Bay of Badjo, West coast of Flores. Depth up to 40 m. 
Bottom: mud, sand and shells, according to locality. Numerous (about 25) specimens. 
Middle-sized specimens: attached to small sticks or stems, and therefore laterally flattened 
with the basis elongated, narrow, and excavated. Longest diameter of one of the larger spe- 
cimens near the basis, 8 mm. Colour from nearly white to dark purple, the colour being 
mostly in longitudinal stripes and in dark patches, arranged in horizontal lines crossing the 
longitudinal ones. Orifice large, rhombiform, toothed. Radii with the summits never quite 
parallel to the basis, but slightly or strongly oblique, often somewhat excavated. The colour 
of the radii is often darker than that of the compartments, and in several specimens even dark 
purplish; always distinctly horizontally striped. 
The scutum with the lines of growth developed into distinct ridges, showing, though 
not very distinctly, microscopical beads at the surface. Adductor ridge long, but not very prominent. 
The tergum has the spug broad and the longitudinal furrow indicated by a very 
shallow depression only; extremity of the spur rounded; crests for the depressor muscles very 
distinct. Growth-ridges well-developed and beaded like those of the scutum. 
This set shows some resemblance to Darwin’s var. (9) cevvatus, but I think it best 
not to identify it with the same. 
Illa. Stat. 71. Makassar and surroundings. May 1o—June 7, 1899. Depth 27—32 m. 
Three specimens of very characteristic shape, only one of which, however, is complete: 
the second is an empty shell without the opercular valves, and the third is represented by a 
40 
