CCELOPLEURUS LONGICOLLIS. 89 



The sphoeridia, of which there are from 6 to 12 on each ambulacrum, 

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

 maculatus. 



Coelopleurus longicollis A. Ag. and CI. 



Coeleopleurus MaiUardi A, Agassiz, 1881, "Challenger" Echini, p. 60 {partim). Pls.V, 

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



(Non Keraiaphorua Maillardi Michelin, 1862. Halliard's Bourbon. Ann. A, p. 2.) 



Plates 49, figs. 29, 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. L, 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 pedicellariaB 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 ophicephalous pedicellarige are very characteristic, for not only 

 are they colorless (i. e. the lime), but the valves (PI. 49, fig. 29) are very 

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

 about two-thirds of a millimeter long. 



Triphyllous pedicellarise are apparently wanting. 



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

 not distinguishable from those of maculaiiis. 



ASPIDODIADEMATID^ Duncan. 



The Pedicellari^ and Other Structural Characters. 



Plates 44, figs. 3, U ; 50, figs. l-lo. 



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

 (1904), and Doderlein (1906) the pedicellarioe of this family are very com- 

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

 Dermatodiadema liorridimi and glohidosmn, which we describe and figure 

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

 species of Aspidodiadema, a brief account of the pedicellarice of the family 



