Description of Genera and Species. 43 



whether it was suppUed with longitiuliual keels. There is a depression in the place 

 where the cervical fold ought to occur, judging by the position of the depression caused 

 by the crushing in of the body of the mandible. At least four of the last trunk 

 segments are visible. The sternites of these are strong and wide, with central raised 

 triangular area with wide base resting on anterior margin, as in TeaUiocaris and 

 Anthrapahemon, the divisions l^etween the segments being well marked and bordered by 

 thickened margins. From these segments the limbs, the bases of which must have been 

 wide apart, are all torn off. A confused mass of organs all scpieezed up together is seen 

 in front of the first visil)le sternite; among this, four joints of a very massive limb can be 

 traced The tip joint is spatulated, pointed, and short, and has a strengthening keel. 

 This is succeeded b}' a short joint at the two articulations of which the limb is flexed 

 back upon itself. The third joint from the tip is longer than the other two combined, 

 and is laterally flattened and strengthened Ijv longitudinal keels and gently curved 

 upwards ; this long joint is articulated to another joint, making an elbow with it and 

 flexing forwards upon it. A portion of this last joint only is shown. This limb appears 

 to be lying upon another and exactly similar one. As already stated, the position of the 

 body of the mandible is indicated by the crushing in of the carapace. To judge from 

 the position of the mandiljle, the limbs described and the mass of deljris of other limbs 

 and trunk organs seen, must be displaced and lying free from their original attachments. 

 The tail is massive and long and tapers gently towards the sixtli caudal segment. The 

 individual segments increase slightly in length in turn, the sixtli being somewhat the 

 longest. Lateral longitudinal keels appear upon several of the segmients, and it is 

 natural to infer that there was a median keel upon these segments also, although the 

 mid-line of the back is ccmcealed. All the segments are supplied with well formed 

 subquadrate epimeral lappets rounded in front and pointed behind, with strong 

 .strengthening bands along their anterior and lower margins, ending in a spine near the 

 posterior angles. The epimera of the sixth segment are shorter and smaller than the 

 others. The sternites of the tail segments are very massive and strong. The anterior 

 strengthening band of each passes straight across from side to side, but the posterior 

 margin is deeply hollowed out to allow ibr rolling. The triangular areas thus formed 

 are perforated with very large pear-shaped hollows for the articulation of the bases of 

 the pleopods, wliich must have been very massive and powerful. The sternite of the 

 sixth segment seems to have been wide and smooth and with two tumid areas behind 

 the lateral angles. It is evident that the l)ases of the epimera on tliis segment were not 

 confluent as in (riKit/iop/Kiiisia. 



The telson seen from beneath is cordate and ends in ilie usual hastate spine. Ai 



