The 1st, 2nd, 4th and 5th thorax segments ( counting front to back ) do not carry spines, the frontal edge of the outer lobes ( or pleurae ) suddenly angles back at 150?ending in a blunt tip.
22.
Its remains have been found in Canada ( British Columbia, especially in the Burgess Shale, and thoracic segments, pleurae with long spines, additional spines on the axial rings, and a pygidium that is considerably smaller than its cephalon.
23.
The axis is about as wide as each of the ribs ( or pleurae ) to its sides, not counting the spines at their tips, which gradually arch further back while slightly increasing in length, while the spines on the rear thoracic segment are much longer, about twice as long as the associated pleurae, are directly entirely backwards, and extend convincingly beyond the pygidium.
24.
The axis is about as wide as each of the ribs ( or pleurae ) to its sides, not counting the spines at their tips, which gradually arch further back while slightly increasing in length, while the spines on the rear thoracic segment are much longer, about twice as long as the associated pleurae, are directly entirely backwards, and extend convincingly beyond the pygidium.
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