PLATE V. 



Figs. 1-5. Ferimecturus parki (Peacli) . . . . Page 40. 



1. Nat. size. Shows part of trunk and tail of one of the largest .specimens. Locality, Glen- 



cartholm, Langholm, Dumfriesshire. M. 789^'. 



2. Nat. size. Almost complete tail fan of very large individual. Same locality. M. 3091^'. 



3. Nat. size. Part of trunk and tail of moderately large individual, showing movable rostrum, 



eye, the .antennules. antennte with basal scale. Same locality. M. 2180". 



4. Nat. size. Head and tiunk of small specimen pai-tly preserveil in relief. Shows details of 



keels on carapace and tail and nature of tail fan. Same locality. M. 1564'^. 



5. Nat. size. Part of trunk and tail. Shows some of the trunk limbs. Same locality. 



M. 2825". 



Fig. 6. Perimecturiis parki, var. duplicicarinatus var. nov. Nat. size. Trunk and tail preserved in 

 relief, showing double row of keels down the middle of the tail. Same locality. 

 S. 3. ,. Page 41. 



