CCELOPLEURUS LONGICOLLIS. 89 



The spha^ridia, of which tliere are from 6 to 12 on each ambulacrum, 

 are wider than long, and are deeply sunken in pits in the test, as in 

 macidatiis. 



CcElopleurus longicollis A. Ag. and CI. 



Coeleopleurua Maillardi A. Agassiz, 1881. " Challenger " Echini, p. 60 (partim). Pls.V, 

 figs. 1, 2 ; VI, figs. 1-7, 15-22. 

 (Nou Keralaphorua Maillardi Michelin, 1862. Maillard's Bourbon. Ann. A, p. 2.) 



Plates 49, figs. £9, 30 ; 53, fig. 10. 



We need not describe this species here further than to refer to the 

 description of specimens collected at Station 201, Straits of Basilan, P. I., in 

 the " Challenger " Echini, p. 60, which applies to C. longicollis, with the excep- 

 tion of such part as applies to the description of the banded, colored spines, 

 a feature of C. maculatus (PI. V, fig. 3). 



The tridentate pedicellarioe are scarcely distinguishable from those of 

 maculatus, except that the lime is colorless and the upper end of the stalk 

 (PI. 49, fig. 30) has a marked constriction near the tip. The valves are .30- 

 2.65 mm. in length. 



The ophiceplialous pedicellarias are very characteristic, for not only 

 are they colorless (i. e. the lime), but the valves (PI. 49, fig. S9) are very 

 broad and not at all constricted, and have a narrow apophysis ; they are 

 about two-thirds of a millimeter long. 



Triphyllous pedicellariae are apparently wanting. 



The calcareous particles in the pedicels and gills and the sphieridia are 

 not distinguishable from those of maculains. 



ASPIDODIADEMATID^ Duncan. 



The Pedicellari^ and Other Structural Characters. 



Plates 44, figs. 3, ^ ; 50, figs. 1-15. 



Thanks to the descriptions and figures of Mortensen (1904), de Meijere 

 (1904), and Dtiderlein (1906) the pedicellariae of this family are very com- 

 pletely known, the only species not examined by any of those writers being 

 Dennatodiadema horridum and glohdosuni, which we describe and figure 

 herewith. As we have also examined D. antdlarum and all of the four 

 species of Aspidodiadema, a brief account of the pedicellarioe of the familj' 



