184 



BRITISH PALEOZOIC PHYLLOCARIDA. 



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 0/ Dithyrocaris, cJt., some of them Foreign. 



Several have been already described as belonging to known species 

 preceding pages, as indicated by the following Table. 



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



PLATE 



XIX. 

 XXL 



XXIII. 



XXIV. 



XXV. 

 XXIX. 



FIG. 



3 

 4 

 4 



5 

 10 



il 



5 

 6 



7 

 8 



01 

 10/ 

 11 



n 



G I 



7 



6 



1 1 



2 ) 



3a 



SPECIES. 



D. (/lahra 

 D. testudinea 



B. Colei 

 D. lateniUs 

 D. teatiidinca 



1). Dunnii 



D. r/lnljiui 



D. tricornis 



I), testudinea 

 I), ticouleri 



D. iJunnii 



I). Xeihoni 



PAGE 



138 

 139 

 140 

 150 



187 



165 



185 

 184 

 150 

 151 



186 



140 



172 



14G 

 156 



186 



187 



PLATE 



XXIX. 



XXXI. 



FIG. 



3j 

 4 



n 



6j 



n 



&/ 



9 



10 



11 



12 



13 



14 

 15 

 16 



4 



6 



7 



SPECIES. 



D. Xeihoni 

 R/i. venosa 

 D. carbonaria 



I). Kochi 



J), hreviaculeata 



D. testudinea ... 



Ft. f Jaschei ... 

 D. testudinea ... 

 D. ins ignis 



Sp. z>. ? 



D. Kdi/sevi 

 M. Xeptuni ... 

 M. occani 



in the 

 134.) 



PAGE 



... 187 



... 188 



... 190 



.. 191 



... 191 



... 153 



... 193 



... 150 



... 162 



... 188 



... 192 



... 192 



... 193 



12. DiTHYKoCAKis L.^TEKALis, M'Col/, 1S51. Plate XXIII, figs. 5 and 6. 



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

 described by 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 ma}- have belonged to a large form of D. testudinea (compare 

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



