184 



BRITISH PALAEOZOIC PIIYLLOCARIDA. 



Though not a perfect valve, yet it has distinct characters of its own, sufficient 

 to induce us to give it a name, so that it may be noted and catalogued by our 

 friends in Germany. It is named after the above-named worthy geologist, who for 

 many years worked at the history of the Entomostracous Crustacea and other 

 fossils of the Devonian and Permian strata. 



Caudal Extremities of Dithyrocaris, fyc, some of them Foreign. 



Several have been already described as belonging to known species in the 

 preceding pages, as indicated by the following Table. 



(For the proportional characters of style and stylets see the Table at p. 134.) 



PLATE 



FIG. 



SPECIES. 



XIX. 



3 



D. glabra 



— 



4 



— 



XXI. 



4 



D. testudinea 



— 



5 



— 



— 



10 



— 



XXIII. 



•) 





— 



D. Colei 



— 





— 



5 

 6 



7 



D. lateralis 



— 



D. testudinea 



— 



8 



— 



— 



"I 

 10/ 



D. Dunnii 



— 



11 



D glabra 



XX I V. 



1} 



D. tricurnis 



— 





— 



7 



D. testudinea 



XXV. 



G 



D. Scouleri 



XXIX. 





D. Dunnii 



— 



2 ) 





3rt D. Neihoni 



PAGE 



IBS 

 139 

 140 

 150 

 187 



1G5 



185 

 184 

 150 

 151 



186 



140 



172 



146 



156 



186 

 187 



PLATE 



FIG 



SPECIES. 



XXIX 



35 

 3c 



\ D. Neihoni ... 



— 



4 



Rh. venosa 





6j 



I). carbonaria 



— 



7] 

 8J 



I). Kochi 



— 



9 



D. breviaculeata 



— 



10 ' 





— 



11 





— 



12 



L D. testudinea ... 



— 



13 





— 



14 





— 



15 | 



16 j 



Pt. ? Jaschei ... 



XXXI. 



4 



D. testudinea ... 





6 1 



7J 



- D. insignia 

 Sp. D.? 



D. Kayseri ... 

 31. Neptuni ... 

 31. ocean i 



. Plate 



XXII 



[, figs. 5 and 6. 



PAGE 

 187 



188 

 190 



191 

 191 



153 



193 



150 



162 



188 

 192 

 192 

 193 



12. DrTHYKOCARIS LATERALIS, M'CoiJ, 1851 



Specific Characters. — This is a well-marked three-spined tail-piece ; first 

 described b}^ M'Coy, in 1351, as a specimen from Derbyshire, and now also recog- 

 nised from Roxburghshire. Its relationship to the known species of Dithyrocaris 

 is not clear; but it may have belonged to a large form of D. testudinea (compare 

 PI. XXI, fig. 5), or a small form of D. tricornis (see PI. XXIV, fig. 6). 



