258 BULLETIX 100, UXITED STAfE^ NATIONAL MUSEUM. 



The abactinal plates have short lobes, in form much like those of 

 C. japonicus. They are very short, broad, rounded, or truncate, and 

 often irregular or unsymmetrical in position, especially on the distal 

 and lateral portions of the papular areas. The plates are wholly 

 different in form from those of C. clarln^ which have the lobes bent 

 downward so that the center of plate is hollowed out. (See Fisher, 

 1911(^, pi. 59, figs. 6, 6ff.) Papulae distributed over center of disk 

 and very broad radial areas. 



Marginal plates small, as in C . darkly forming a thin rounded 

 margin to disk. Superomarginals 18, longer than wide up to the 

 ninth or tenth, then rather rapidlj^ widening, the fifteenth, six- 

 teenth, and seventeenth being the widest, and of these the sixteenth 

 is slightly the largest and is the widest of all the superomarginals. 

 While the other plates are closely granulate, these have a large cen- 

 tral bare area (the thirteenth and fourteenth, a smaller) and appear 

 swollen. This is very nuich as in f. clarM^ except that in smithi 

 the distal superomarginals do not touch medially, while they do in 

 clarM. Terminal plate broader than long, o^•oid, almost globose 

 with a semicircular terminal seri(\s of globose granules, and several 

 tubercular spinelets beneath them. 



Inferomarginals very similar to ;;i!per(.marginals, the distal 6 or 7 

 with a central bare space increasing in size distad. The first 6 

 are slightly longer than wide; thence the length gradually dimin- 

 ishes until the distal plates are wider than long, but not wi<ler than 

 the proximal plates as in the case of the superomarginals. 



Actinal intermediate plates numerous, flat, 4-sided, not ver^' 

 regular, in 12 or 13 chevrons (each, except sometimes the first, with 

 an odd interradial plate at the apex), the plates decreasing in size 

 toward the margin and reaching to within •! inferomarginals of 

 the terminal plate. Granules coarse, well spaced, subspherical or 

 in the case of the peripheral flattened on the outer side and ap- 

 pressed to peripheral granules of neighboring plates. One inter- 

 radius has a single spatulatc pedicellaria. 



Aclambulacral plates at first a little longer than wide, then a 

 trifle wider than long. FurroAv margin nearly straight. Furrow 

 spines 5, sometimes 4, equal, about as long as width of plate, com- 

 pressed or prismatic, truncate or round tipped often with a pit, 

 notch, or groove at the tip, the latter rarely running down the 

 outer (upper) side of spine. The spines vary in shape within the 

 same series, being triangular or square or elliptical in section, with 

 all the intermediate A'ariations. Just back of the furrow series is 

 a series of 3 coarser, usually four-sided spines, slightly shorter than 

 furrow series and occupying the full length of plate. The tip is 

 curiously etched out by grooves which may run part way or all the 



