. The North American Crinoidea camerata [microform]. Crinoidea, Fossil; Crinoïdes fossiles. Fio. 15. Fiti. 14. Fio. in. Fio. II', showing plntcs of t]io dorsiil cup, the arms and their partitions. Fio. 15, the cul;x in a side view. FlQ. 10, llie partition walls u( KiiraU/ptocrinua rosaeeus (after Sehiiltzc). i:=hasnls; 72 =: Railials ; /=:costaIs; //=(li!>ticlml9 ; iir ^ inlorhrachials ; iV ^ intcrdisticlials /^ = arnis; (/•/'= intcrradial partitions; iV//'= intcnlistichal partitions; /i := llrst ring of plates of the trgnicn ; 13 = the second ring; (S ^ the third ring ; and /4 = t\ie fonrt
. The North American Crinoidea camerata [microform]. Crinoidea, Fossil; Crinoïdes fossiles. Fio. 15. Fiti. 14. Fio. in. Fio. II', showing plntcs of t]io dorsiil cup, the arms and their partitions. Fio. 15, the cul;x in a side view. FlQ. 10, llie partition walls u( KiiraU/ptocrinua rosaeeus (after Sehiiltzc). i:=hasnls; 72 =: Railials ; /=:costaIs; //=(li!>ticlml9 ; iir ^ inlorhrachials ; iV ^ intcrdisticlials /^ = arnis; (/•/'= intcrradial partitions; iV//'= intcnlistichal partitions; /i := llrst ring of plates of the trgnicn ; 13 = the second ring; (S ^ the third ring ; and /4 = t\ie fonrth or npper ring of the tcgnien, plates imited to a certain number. The dorsal cup is perfectly pentamerous, the rays being separated by intorbrnchialH of uniform number and size, and their main divisions by a single large interdistichal. Still more important from a classificatory point of view is the structure of the ventral di.^k, which differs from that of any other known Crinoid, recent or fossil. It is com- of only four rings of largo plates of irregular form, of which the two lower ones completely cover the disk ambulacra, which rre subtegminal, the upper ones forming a long neck or tube enclosing a narrow canal. Not only do the plates of the disk, like those of the do".sal cup, consist of a defi- nite number, but tliey are throughout tliis family unusually large, and their arrangement does not appear to be in accordance with the pentamerous. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wachsmuth, Charles, 1829-1896; Springer, Frank, 1848-1927. Cambridge [Mass. ] : Printed for the Museum
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishercambridgemassprint
