The tergites, or chitinized dorsal halves of the body rings, are fused to form a " prosomatic carapace," or carapace of the prosoma, in both Limulus and Scorpio (see figs, 7 and 8). [Please select]
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The part of the body, which I have called the prosoma, that is the protuberant, non-articulated, lower part of the thorax (Pl.) [Please select]
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The thorax which supports the cirri is also unusually small, plainly articulated, and separated from the prosoma by a deep fold. [Please select]
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The thorax and prosoma are of the same shape as in _I. [Please select]
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In most of the species the prosoma is little developed, and the first cirrus is placed far from the second. [Please select]
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_--Prosoma moderately developed; first pair of cirri rather far removed from the second pair. [Please select]
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Maxillæ with three tufts of fine bristles, separated by larger spines; caudal appendages uniarticulate; filamentary appendages attached to the prosoma. [Please select]
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Within the prosoma there is a strong adductor muscle, running straight from side to side, for the purpose, as it appears, of flattening the body. [Please select]
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There are two dorso-lateral channels in the prosoma, which are in direct connection with the great main channel, running down the rostral (_i.) [Please select]
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