Smithsonian miscellaneous collections . ngth;height very variable (text figs. 19, 21, 22), varying from 36 to 57percent of the length; marginal outline variable, angularly penta-gonal in some specimens, smoothly pentagonal in others; anteriormargin pointed, posterior truncated, sides indented slightly in all butthree specimens; petals strongly inflated in some specimens, slightlyinflated in other, adorally test greatly depressed in area immediatelyaround peristome. 28 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I45 Apical system.—Central, monobasal, madreporite pentagonal, geni-tal pores small,
Smithsonian miscellaneous collections . ngth;height very variable (text figs. 19, 21, 22), varying from 36 to 57percent of the length; marginal outline variable, angularly penta-gonal in some specimens, smoothly pentagonal in others; anteriormargin pointed, posterior truncated, sides indented slightly in all butthree specimens; petals strongly inflated in some specimens, slightlyinflated in other, adorally test greatly depressed in area immediatelyaround peristome. 28 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I45 Apical system.—Central, monobasal, madreporite pentagonal, geni-tal pores small, five, varying in position from adjacent to madre-porite, or far distant, occurring in interambulacra. Ambulacra.—Petals all similar, broad, closed, long petals II, III,IV extending almost to margin, petals V, I over two-thirds distanceto margin; number of pore-pairs in each poriferous zone variable;pore-pairs near apical system extremely small, difficult to see; porifer-ous zones only slightly depressed relative to
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Keywords: ., bookauthorsm, bookcentury1800, bookdecade1860, booksubjectscience
