MUSEUM OF COMPARATIVE ZOOLOGY. 215 
men, but possibly the differences may be due to age. The centrodorsal piece is 
long conical or rather acorn-shaped, 5 mm. high by 33 in diameter ; it has ten 
vertical rows of horseshoe-shaped sockets for the cirrhi, 5 or 6 to a row, alter- 
nate on contiguous rows. It shows in the upper part ridges corresponding to 
the interambulacral spaces. Cirrhi with long compressed joints. First radials 
projecting beyond the edge of the centrodorsal piece, Second radials smooth 
and but little shorter than broad (in the type of my A. cubensis the first radials 
are not visible and the second quite short) Axial rhombic. First brachials 
well separated from one another. Syzygium in third joint, afterwards four 
joints between two syzygia. Mouth eccentric ; anus central and tubular, 
Station No. 43, Lat. 24° 8! N., Long. 82? 51! W. 339 fms. 
A. smaller equally mutilated specimen had been dredged by myself formerly 
in 450 fathoms near Havana. 
Antedon alata Pourr. sp. nov. 
Ten to twelve arms. Centrodorsal piece flat and destitute of cirrhi in the cen- 
tre. The cirrhi in one row, about fifteen in number, with seventeen to eighteen 
joints, which are rather short, thick and compressed ; the fourth joint is the 
longest. Every joint has a blunt spine on the lower side, First radial con- 
cealed, second short; axialshort, triangular. First syzygium in third joint ; 
four or five joints between successive syzygia. "They increase in size from the 
beginning to the middle of the arm. The distal edge of the joints is raised in 
the shape of a serrated scale on the side nearest the pinnule, particularly about 
the middle of the arm. The first pinnule is longest; they then diminish, to 
increase again somewhat till near the end of the arm. A membranous expan, 
sion borders the arms, embracing three or four joints of the pinnules and 
fringing the latter also in proportion. This expansion is greatest towards the 
end of the arm. Mouth eccentric ; anus not quite central, prominent, and 
partly surrounded by calcareous papille. Color in alcohol, light, with darker 
bands across the arm, about six joints apart. Spread about 10 em. 
Barbados. 100 fms. Hassler Expedition. 
Antedon granulifera Pourr. sp. nov. 
Twenty arms. Centrodorsal piece hemispherical and covered with cirrhi in 
the young, but becoming bare and flattened in the middle at a later period, 
showing more or less obsolete traces of the sockets. At the junction with the 
radials it has five knobs projecting into the interambulacral spaces. Cirrhi in 
two or more rows, with fifteen to eighteen joints, longer than broad, except the 
two or three first ones, which are very thick. Penultimate with a spine. First 
radials entirely concealed, very firmly connected with one another and with 
the rosette. Second radials thin; axials very depressed, pentagonal. First 
brachials rather flattened and in close lateral contact. Three brachials between 
primary and secondary axials, one between secondary and tertiary, Syzygia 
rather irregular, nine, ten, or more joints apart. Sometimes there are syzygia 
