178 BRITISH PAL.^OZOIC PHYLLOCARIDA. 



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

 Report on Palteoz. 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. 2-5) is in grey, finely laminated 

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

 Quebec, Canada. 



Ch^nooaeis,^ 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. Chjsnocaris tenuistiuata (M'Coi/, 1844).' Plate XXI, figs. 8, 9, 11 «— f; 



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



DiTHTHOCAEis TENTTISTEIATUS, R. Griffith, 1842. Notice respecting the Fossils of the 



Mountain-Limestoue of Ireland,^ p. 22 (Table). 

 Nomen nudum ex Maccoyii manuscripto. 

 ? AyicrLA PAEADOXIDES, De Koninck, 1842. Descript. Anim. Foss. Terniin Car- 



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

 DiTHYEOCAEis TENuiSTEiATUS, M'Coy, 1844. Synops. Char. Foss. Carb. Limest. 



Ireland, p. 1G4, pi. xxiii, fig. 3 ; and 1862, edit. 

 2, p. 2.34. 

 AvicrLA PAEADOXIDES, Broiin, 1848. Index Pala^out., vol. i, p. 140. 

 DiTHYEOCAEis TENUISTEIATUS, Morris. Catal. Brit. Foss., edit. 2, p. 107. 



— — Salter and Woodward, 18G5. Chart Foss. Crust., 



p. 17, fig. 13. 



— — B. Griffith, 186G. Jouru. Geol. Soc. Dublin, vol. 



is, pp. 68 and 100. 



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



pi. iii, fig. 4, and p. 521 ; and Eeport Brit. 

 Assoc, for 1S71 (1872), p. 53. 

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



vol. iii, Appendix, p. 30. 

 ? — — J. £. S. Hunter, 1875. Palaeont. Carbonif. Strata* 



W. Scotland, part ii, p. 39. 



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



2 Or 1842 according to Griffith. 



^ 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 " Gannister Limestone and 

 Shales, Upper Limestone series, Carluke." 



