A treatise on zoology . aving thearms more free than usual in thesub-order ; IIBr rami bear branch-ing ramules, either along each sideor in clusters at end, but theheterotomy is always bilateral, notunilateral as in all the genera justmentioned—a fact suggesting thatOnychocrinus should form a distinctfamily or, at least, sub-family ( 6) ; anals 3-5 resting on post. B(see also Fig. XVII. 4). Family Impinnata withover 20 iBr, G or more illBr, andisotomous or almost so, to VI Br anals not a distinct serits, but represented by greater widthof iBr in post. IK. Genera—Swieno
A treatise on zoology . aving thearms more free than usual in thesub-order ; IIBr rami bear branch-ing ramules, either along each sideor in clusters at end, but theheterotomy is always bilateral, notunilateral as in all the genera justmentioned—a fact suggesting thatOnychocrinus should form a distinctfamily or, at least, sub-family ( 6) ; anals 3-5 resting on post. B(see also Fig. XVII. 4). Family Impinnata withover 20 iBr, G or more illBr, andisotomous or almost so, to VI Br anals not a distinct serits, but represented by greater widthof iBr in post. IK. Genera—Swienocriniis, Austin (1843), variable numher<»r beyondor number Silurian, Kiirope, and N. America, lias UA sunk between post, andr. post. BB, so that proximal iBr is supported between post. B and UA(Fig. XXlVtt). In Forhtsiocrinm Ayandzi Carboniferous, N. America,wliich may i)e placed in this family, ])OHt. B supports 2 iBr, and thereare considerably more iBr in this IH. Patelloid plates are riclily THE CRINOIDEA 191.
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