52 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 149 



mately same width as distance between pores of pair ; 14 pore-pairs in 

 poriferous zone of specimen 21.1 mm. long, 19 in specimen 40.0 mm. 

 long ; pores beyond all petals single, slitlike, situated on adoral edge 

 of plate. 



Phyllodes. — Broad (pi. 13, fig. 4) pores single, large, on adoral edge 

 of oval depression ; three pores in ambulacrum III, 7-8 in ambulacra 

 II and IV, 6-7 in ambulacra V and I. 



Peristome. — Anterior, located 70 percent anterior of distance be- 

 tween posterior and anterior margins ; opening wide, low, crescent 

 shaped. 



Spines. — Preserved only on one incomplete small specimen (pi. 14, 

 figs. 4, 5), originally approximately 23 mm. long; adapically most of 

 specimen missing, spines expanded at tips, spines near ambulacra 

 curving over ambulacra ; adorally, plastron spines (pi. 14, fig. 9) very 

 distinct, long, 4.5 mm. long, flattened and expanded at tips transverse 

 to length of test, tips curving anteriorly, similar spines but longer (6 

 mm. long) on edge of posterior interambulacra adjacent to ambulacra 

 V, I ; no long spines in phyllodes or most of posterior ambulacra ; few 

 minute spines, 0.5 mm. long, scattered over otherwise bare surface ; 

 long tapering, pointed tipped spines (6 mm. long) in anterior inter- 

 ambulacra and a few in ambulacrum III. 



Sphaeridia. — Many sphaeridia present along full length of posterior 

 ambulacra on adoral side ; a few in phyllodes of the other three am- 

 bulacra. 



Periproct. — Longitudinal, high on posterior truncation. 



Tubcrculation. — Adapically, tubercles inside and outside of peri- 

 petalous fasciole of approximately same size; adorally tubercules on 

 plastron situated anteriorly on raised oval platforms, centrally in 

 other areas ; peripetalous and lateroanal f ascioles present ; peripetal- 

 ous fasciole passing close to extremities of petals, (pi. 14, fig. 3), 

 curving sharply inward in all interambulacra except interambulacrum 

 5, fasciole widest at extremity of petals II and IV (anterior paired 

 petals), narrowest at indentations in interambulacra; lateroanal fasci- 

 ole leaving peripetalous fasciole in posterior paired interambulacra 

 and passing down under periproct ; narrowest at perpetalous fasciole, 

 greatest width directly under periproct. 



Pedicellariae. — (Fig. 15). Only two pedicellariae found on single 

 specimen with spines, both globiferous (pi. 14, figs. 6-8; text fig. 15) 

 with valves, 0.4 mm. in length ; base of valve relatively broad, tapering 

 to slender, tubular blade above apophyses; two lateral articulating 

 teeth present on articular face, just above the median apophysis rises 



