A treatise on zoology . ?.(1886), Carboniferous, N. America, is like a Schizohlastus with smallA. The hydrospires differ from those of Nudeocrinus and Schizohlastusonly in the development of hydrospire-plates (cf Troostocrinus) whichextend right up the sides of the lancet-plate, separating it from thefolds and from the walls of the radial sinus. But where the A are Fia. XI. Section of ambulacrum of Nudeocrinus Ver-neuili, x 10 diam. , bracliiole; L, lancet-plate ; ), outer side-plate; , side-plate;s, supposed suture between lateral and centralinterambulacrals. 90 THE BLASTOIDEA. Fl&
A treatise on zoology . ?.(1886), Carboniferous, N. America, is like a Schizohlastus with smallA. The hydrospires differ from those of Nudeocrinus and Schizohlastusonly in the development of hydrospire-plates (cf Troostocrinus) whichextend right up the sides of the lancet-plate, separating it from thefolds and from the walls of the radial sinus. But where the A are Fia. XI. Section of ambulacrum of Nudeocrinus Ver-neuili, x 10 diam. , bracliiole; L, lancet-plate ; ), outer side-plate; , side-plate;s, supposed suture between lateral and centralinterambulacrals. 90 THE BLASTOIDEA. Fl<;. of ambulacruni of Orbitremites reached, the lancet-plates abut directly on them, without leaving anypores ; the hydrospire-canals pass up beneath the lancet-plates, and openthrough spiracles on either side of each A. Orbitremites, T. &. T. Austin (1842, generally known as Granato-crinus, Hall, 1862), Carboniferous,England, N. America, and (?) Queens-land (Fig. XV. 3, 4). The generalshape and relations of the plates areas in Schizohlastus and the same as in Cnjpto-blastus (Fig. XII.). The hydrospire-canals here are surrounded by theA, and pass through them to fivesingle spiracles (the posterior confluentNorwoodi, xio (liam. /i;?, iiydrospire-piate. with the anus) at the apices of the A, which sometimes project as shorttubes. The plates roofing the mouth are minute and usually Eth. & Carp. (1886), Carboniferous, England, and (?) , differs from Orbitremites in that the hydrospire-canals passbeneath
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