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 3i 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 Pourt. sp. nov. 



Ten to twelve arms. Centrodorsal piece flat and destitute of cirrhi in the cen- 

 tre. The cin-hi 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 ; axial short, 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 

 flinging the latter also in proportion. Tliis expansion is greatest towards the 

 end of the arm. Mouth eccentric ; anus not quite central, })rominent, and 

 partly surrounded by calcareous papillae. Color in alcohol, light, with darker 

 bands across the arm, about six joints apart. Spread about 10 cm. 



Barbados. 100 fms. Hassler Expedition. 



Antedon granulifera rouRx. 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 brarliials between 

 primary and secondary axials, one between secondary and tertiary. Syzygia 

 rather irregular, nine, ten, or more joints apart. Sometimes there are syzygia 



