ON THE FOSSIL PHYLLOPODA OF THE PALAEOZOIC ROCKS. 65 



12. Diihtjrocaris, sp. indet. Etheridge, ' Q. J. G. S.,' xxxv. 1879, p. 467. 

 Lower- Carhoniferous. — Cement-stone group, near New Castleton, Rox- 

 burghshire. 



Specimen Formerly Referred to Dithyrocaris. 



[Dithyrocaris'] pholadomya, Salter MS., 1863, 'Quart. Journ. Geol. 

 Soc.,' vol. xix. 1863, p. 92, note. 



D. pJioladomyia, Packard, 'Monogr. Phyllop. N. America,' 1883, p. 

 452. 



(Specimen.) Mus. Pract. Geol. D *— , marked ' Dithyrocaris pholadi- 



formis,' Salter MS. In a dark micaceous sandstone of the Lower-Car- 

 boniferous Limestone, Berwick-upon-Tweed. ' Catal. Sil. Cambr. Foss. 

 M. P. G.,' 1865, p. 116. 



This specimen is probably allied to Saccocaris, Salter (1868 and 1873), 

 First Report ' Pal. Phyll.,' 1883, p. 219. 



III. Devonian Species of Dithyrocaris. 



1. Dithyrocaris ? striata, W. and E., 1873. 



'Mem. Geol. Surv. Scot!., Expl. Sheet 28,' 1873, p. 100. 

 'Geol. Mag.,' 1874, pp. 109, 110, pi 5, f. 6. 

 ' Catal. W.-Scot. Foss.,' 1876, p. 27. 



Devonian. — Lower Old Red Sandstone ; Carmichael Burn, 4<\ miles 

 S.E. of Lanark. 



2. Dithyrocaris Belli, H. Woodward, 1871. 



D. striata, H. W., ' Brit. Assoc. Rep.,' 1870, sect, p, 90. 

 D. Belli, H. W., ' Geol Mag.,' 1871, p. 106, pi. 3, f. 5. 



' Brit. Assoc. Report,' August 1871. 



Miller, ' Catal. Pal. Foss. Amer.,' 1877, p. 217. 



D. striata, Bigsby, 'Dev.-Carb. Thesaurus,' 1878, p. 27. 



D. Belli, Packard, 'Monogr. N.-Amer. Phyll.,' 1883, p. 452. 

 Devonian. — Middle-Devonian ; Gaspe. 



It is possible that the figure represents two opposite valves, reversed 

 and overlapping on their inner margins. 



3. Dithyrocaris Neptuni, Hall, 1863. 



' Sixteenth Annual Report New-Tork State Museum,' 1863, Appendix 



D, p. 75, pi. 1, f. 9. 

 ' Palseont. New York,' vol. v. Part II.; 'Illustrations of Devonian 



Fossils,' 1876 ; pi. 22, f. 1-6, carapace and spines, Portage Group; 



pi. 23, f. 1-6, tail-spines, Hamilton and Portage Groups. 

 Miller, ' Catal. Pal. Foss. Amer.,' 1877, p. 217, ' Chemimg Group.' 

 Packard, ' Monogr. N.-Amer. Phyll.,' 1883, p. 452, woodcut, f. 73. 

 Upper {and Middle ?) Devonian. — Hamilton and Portage Groups. 



4. Dithyrocaris Kochi, Ludwig, 1864. 



' Palseontographica,' vol. xi. p. 309, pi. 50, fjla, lb, Ic. ■/ / 



Devonian. — Near Herborn, in the Dillthal, Nassau. K 



6. Dithyrocaris breviaculeata, Ludwig, 1864. 



' Palseontographica,' vol. xi. p. 310, pi. 50, f. 2. 



Devonian. — Spirifer-sandstone Series, near the Butzbach, Nassau. 

 6. (Specimen.) Near D. tenuistriata, M'Coy ; from the Cypridinen- 

 Schiefer, near Saalfeld. 



1887. P 



