178 BRITISH PALEOZOIC PHYLLOCARIDA. 



reversed figure given in the ' Geo]. Mag.,' 1871, pi. iii, fig. 5. In the ' Fifth 

 Report on Palaeoz. Phyllopoda,' 1887, p. 65, it was suggested that it is possible 

 that the figure represents two opposite valves reversed and one overlapping the 

 other on their inner margins. 



This unique specimen (British Museum, No. 25) is in grey, finely laminated 

 sandstone (not calcareous) ; from the Middle Devonian, Gaspe, Province of 

 Quebec, Canada. 



Ch^nooaeis, 1 gen. nov. 



This differs from Dithyrocaris in not having a dorsal overriding ridge, and in 

 its valves folding down at the sides ; gaping, however, and not quite closed along 

 the ventral region, so far as known at present. 



1. Ch.enocaris tenuistriata (M'Coy, 1844) . 2 Plate XXI, figs. 8, 9, 11 a—f; 



Plate XXIV, fig. 8 ; Plate XXXI, fig. 5. 



Dithtrocaeis TENTTiSTRiATUS, R. Griffith,184:2. Notice respecting the Fossils of the 

 Mountain-Limestone of Ireland, 3 p. 22 (Table). 

 Nomeu nudum ex Maccoyii manuscripto. 

 ? Avicula paradoxides, Be Koninck, 1842. Descript. Anim. Foss. Terrain Car- 



bonif. Belgique, p. 139, pi. vi, fig. 6. 

 Dithyrocaris tenuistriatus, M'Coy, 1844. Synops. Char. Foss. Carb. Limest. 

 Ireland, p. 164, pi. xxiii, fig. 3 ; and 1862, edit. 

 2, p. 234. 

 Avicula paradoxides, Bronn, 1848. Index Palasont., vol. i, p. 140. 

 Dithyrocaris tenuistriatus, Morris. Catal. Brit. Foss., edit. 2, p. 107. 



— Salter and Woodward, 1865. Chart Foss. Crust., 



p. .1.7, fig. 13. 



— B. Griffith, 1866. Journ. Geol. Soc. Dublin, vol. 



ix, pp. 68 and 100. 



— — H. Woodward, 1871. Geol. Mag., vol. viii, p. 106, 



pi. iii, tig. 4, and p. 521; and Beport Brit. 

 Assoc, for 1871 (1872), p. 53. 

 ? — J. Armstrong, 1871. Trans. Geol. Soc. Glasgow, 



vol. iii, Appendix, p. 30. 

 ? — — J. B.S. Hunter, 1875. Palseont. Carbonif. Strata* 



W. Scotland, part ii, p. 39. 



1 Xaivw, I gape ; and tapis, a shrimp. 



2 Or 1842 according to Griffith. 



3 M'Coy is referred to at p. 8 as having named this and other new species. 



* The specimen here referred to is said to have come from the " Gaunister Limestone and 

 Shales, Upper Limestone series, Carluke." 



