. The North American Crinoidea camerata [microform]. Crinoidea, Fossil; Crinoïdes fossiles. 864 THK t'KIXOlDKA OF NOKTII AMKUICA. >J â i, Icnyth of tlie nriiis, rise only to a certain liciglit, and are not closed from above. The plates, as a rule, are liij,'lily ornamented, strongly nodose, or cxtiiuled into long spines. The cup is constructed of tlie same num- ber of plates, and arranged in exactly the same manner in EHvuhiptovrinm; generally, however, tlie basal concavity is wider, and only partly filled by the coliunn. In the construction of the ventral disk also,
. The North American Crinoidea camerata [microform]. Crinoidea, Fossil; Crinoïdes fossiles. 864 THK t'KIXOlDKA OF NOKTII AMKUICA. >J â i, Icnyth of tlie nriiis, rise only to a certain liciglit, and are not closed from above. The plates, as a rule, are liij,'lily ornamented, strongly nodose, or cxtiiuled into long spines. The cup is constructed of tlie same num- ber of plates, and arranged in exactly the same manner in EHvuhiptovrinm; generally, however, tlie basal concavity is wider, and only partly filled by the coliunn. In the construction of the ventral disk also, the two genera have close affinities; the plates in both forms consist of foin* rings, and in both of them the first ring is composed of twenty plates, the second and third of four ; but the fourth ring contains but four plates instead of ten. and these have no wing-like extensions at their outer faces; the upper parts of their arms are free, and rest directly against the walls of the anal tube. The parti- tion walls, of which there are twenty in this genus, are restricted to the plates of the first ring, and rise but little above their general height, never touching the plates of the second ring. Five of the partitions are su|)portc'd by the interbrachials, five by the inteV- distichals; the remaining ten are interposed between. Fui. 17. Clil- tl>i ill inliT'livtii'lml*; irV = intcrriuiidl )inr(itiiili!t: /'//* â inliTdimivlKil iiarliilMiiH; !>/' intirpiiiniar ; tlic tcH otlicTs, and Tcst upon tlic cdgcs of two palmars. / = llit' llrsi or IipwiT rinir of riii i *x ^'i' c i i ⢠im i ,,i«t,., iâ ,1,.. ..KM. .on,, ll'es'e latter partitions are formed by wmg-like exten- of IcH larifc ami len piniill sutitri^iinnl |iii'ce!«; 2 ~ tlie |ilul4'H itf the i*eci)ii<l rhi^, .1 = thone of the third ritif;, ^ â the platen of the fourth ring. sions from the ten .smaller plates of the first ring; they rise to the .same height as the others, and sep
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishercambridgemassprint
