ON THE FOSSIL niYLLOPODA OF THE PALJEOZOIC HOCKS. 83 



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

 Western New- York State. 



Subsequently Mr. Clarke expressed his wish to include Lisgocaris 

 with Spathiocaris {op. cit. p. 124), because he was certain they agreed in 

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

 rostral piece so often present in Discinocaris and Peltocaris — we may add 

 Aptychopsis and Gardiocaris also. In this view we do not coincide ; and 

 we think that Spathiocaris and Lisgocaris, owing to the form of the 

 cephalic notch, may be distinct from each other and from Discinocaris, as 

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

 they are very closely allied to that genus. There are Goniatites in the 

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



V. Ellipsocaeis, H. Woodward, 1882. ' Annales Soc. Geol. Belgique,' 

 vol. viii. 1882, Memoire No. 4, p. 45 ; ' Geol. Mag.' Dec. 2, vol. ix. 

 1882, p. 444. 



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

 suture. As Discinocaris corresponds with Aptychopsis in having an 

 angular nuchal suture, so Ellipsocaris corresponds with Peltocaris in 

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

 loc. cit. 



1. Ellipsocaris Deivalquei, H. Woodward, 1882. Loco citato and 



woodcut fig. 4. 



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

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

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

 Complete, the carapace would be a.bout 52 mm. in length ; width 24 mm. 

 The 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. Ellipsocaris, sp., 'Opercula of Goniatites,' A. von Keyserling ; 'Wissen- 

 schaftliche Beobachtungen auf 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 Ellipsocaris Dewalquei. Figs. 4 and 

 are more obovate in their complete outline. Fig. 3 is 19 mm. long, by 

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

 wide. 



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



Ellipsocaeis. 



Ellipsocaris Deivalquei (with Goniatites ?).... Belgium. 



„ sp. (in Goniatite beds) .... Petschora-land-. 



YI. Caediocaris, H. Woodward, 1882. 'Geol. Mag.' Dec. 2, vol. ix. 



p. 386. 



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



g 2 



