74 HAWAIIAIS' AND OTHER PACIFIC ECHIXI. 



number of times, but not commonly, off southern Florida and among the 

 West Indies, at depths of 134-400 fathoms.^ 



Podocidaris sculpta A. Ag. 



Podocidaria sculpta A. Agassiz, 1869. Bull. M. C. Z., I, p. 258. 



Plate 49, figs. 1-8. 



This species was not taken by the " Albatross," but is included for its 

 pedicellarioe. 



The tridentate pedicellariae are small and infrequent, occurring chiefly 

 near or below the ambitus. The valves are broad and not much flattened, 

 and are either somewhat pointed (fig. 6) or almost square-cut (fig. 7) at the 

 tip. They are only about .30 mm. long. 



The ophicephalous pedicellariae are abundant, at least abactinally, and 

 some of them at least are as large as the tridentate. The valves (figs. 4, 5), 

 which are about .30 mm. in length, are strongly constricted above the 

 middle and rounded at the tip, with a more or less sharp corner on each 

 side. The apophysis is very broad, and although it forks where the valve 

 is constricted and passes into the margin on each side, a certain portion 

 of it continues to the tip of the valve. The upper end of the stalk is very 

 markedly constricted (fig. 2). 



The triphyllous pedicellariae are relatively very large, and are scarcely to 

 be distinguished from the tridentate, though the valves (fig. 8), which are 

 about .18 mm. long, are proportionately wider and less constricted. 



The calcareous deposits in the pedicels are quite common. They consist 

 of small rods (fig. 3), nearly straight, rounded at the ends, flattened and 

 with a single perforation at the middle. They are about .15 mm. long, and 

 probably lie at right angles to the axis of the foot, in life. 



The sphaoridia (fig. i), of which there is a single one at the actinal end 

 of each ambulacrum, are wider than long, and are little or not at all sunken 

 in any depression in the test. 



* In Mem. M. C. Z., XXXI, " Panamic Deep vSea Ecbiui," heading of Explanation of Plate IX, 

 for " Podocidaris Cobosi " read " Porocidaris Coboai." 



