ON THE FOSSIL riKYLLOPGDA OF THE PAL.KOZOIC ROCKS. 



H3 



IX. 



From the base of the * Hamilton Group' of strata, in Ontario County, 

 Western New- York State. 



Subsequently Mr. Clarke expressed liis wish to include Lisgocarls 

 with Spnthiocaris (op. cit. p. 124), because ho was certain they agreed in 

 having no median suture ; and he thought that neither of them had the 

 rostral piece so often present in Diicinocaris and Peltocaris — wo may add 

 Apti/chop'iis and Oanliocans also. In this view Ave do not coincide ; and 

 wo think that SpathiocariH and Lisfforaris, owing to the form of tho 

 cephalic notch, may bo distinct from each other and from Disrinocaris, as 

 far as the value of that feature goes, but that, having no median suture, 

 they avo very closely allied to that genus. There are OonlatiteH in tho 

 'Hamilton Group' of strata from one of which Liegocaris was obtained. 





V. Ei.LU'SOCAnis, H. Woodward, 1882. ' Annales Soc. Geol. Belgique,' 

 vol. viii. 1882, Mcmoiro No. 4, p. 45; 'Geol. Mag.' Dec. 2, vol. i.\. 

 1882, p. 444. 



Shield or carapace without a median suture, and with a curved nuchal 

 sutui'c. As Dtscinocaris corresponds with Aptijchopsis in having an 

 angular nuchal suture, so ElUpsocaris corresponds with Peltocaris iu 

 its rounded nuchal suture. See the remarks and woodcuts figs. 1-4, 

 loc. cit. 



1. EUipsocaris Deivalquci, H. Woodward, 1S82. Loco citato and 



woodcut fig. 4. 



Shield elongate-oval ; nuchal suture semi-oval, not reaching to tho 

 centre of the shield ; tho lateral projections bordering the rostral piece 

 in front are necessarily curved, tapering, and sharp, like flat horns. 

 Complete, the carapace would be about .'')2 mm. in length ; width 24 mm. 

 Tho rostral piece may have been about 15 mm. long, by 12 mm. wide. 



A most interesting feature of this species is its ornament, not con- 

 sisting merely of numerous fine concentric lines of growth, but retaining 

 the delicate interlinear cross-bars and minute transverse wrinkles seen 

 in Esther ia, ' Geol. Mag.' loc. cit. p. 445. 



From the Upper Devonian of Comblain-la-Tour, Province of Liege. 



2. EUipsocaris, sp., 'Opercula of Goniatites,' A. von Keyscrling ; 'Wissen- 

 schaftliche Beobachtnngen anf einer Reise in das Petschora-Land 

 in Jahre 1843 ; ' ' Geognostische Beobachtungen,' 184G, p. 286, pi. 13, 

 figs. 3-7 (see above, p. 3). 



Figs. 3, 5, and 7 have a more or less oval outline, which, with the 

 rounded notch, is suggestive of EUipsocaris Dewalquei. Figs. 4 and (5 

 are more obovate in their complete outline. Fig. 3 is li> mm. long, by 

 12 mm. wide ; fig. 7, 7f mm. by 4"8 mm. ; fig. 4, 11 ram. long by 9 mm. 

 wide. 



In the Devonian (Domanik) beds of Petschora-land. 



ELLirSOCARTS. 



Mlijisocaris Dervalquci (with Goniatites ?) , 

 „ sp. (in Goniatite be(ls) . 



. T'.clgium. 



. I'etachora-land. 



VI. Cardiocaris, H. Woodward, 1882. 'Geol. Mag.' Dec. 2, vol. ix. 



p. 380. 



Shield obovate, usually elongate, sometimes short ; contracted in the 



g2 



