The keel is pushed back to the distal third of the sternum, whilst the original anterior margin of the keel is correspondingly elongated,and the furcula fused with the rostral portion. [Please select]
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The rostral part of the maxillary is compressed laterally, as is the premaxillary. [Please select]
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_--Rostral keel absent; nuptial spines in males small; interorbital region much wider than eyelid. [Please select]
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The vertical rostral keel is prominent in all freshly preserved specimens; in some older specimens it is indistinct. [Please select]
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Stoddartii_, that it attracted my attention, by the peculiar form of this rostral appendage. [Please select]
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The umbo is situated in the middle of the occludent margin, instead of at the rostral angle, as in the foregoing genera. [Please select]
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Within each of these specimens there was attached within the sack, in a nearly central line, at the rostral end, (Pl.) [Please select]
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The rostral and carinal latera (with the same exception of _S.) [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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_ Valves 5, approximate: carina extending up between the terga, terminating downwards in an embedded fork, or in an external disc: scuta sub-triangular, with their umbones at the rostral angle. [Please select]
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