PLATE VII. 



Fig.s. 1-5. Periinecfurus cotii/)imnis isp. iiov. . . . . . . . . . . . . Page 47. 



1 . Nat. size. Trunk and tail in usual attitude, exposing trunk segments. Show.s movable 



rostrum, eye, tiunk segments, trunk limbs folded up and slightly clenched (compare 

 with recent Anaspides, pi. viii., fig. 11), tail segments and pleopods. Locality, Glen- 

 cartholm, Langholm, Dumfries.shire. M. HIT'". 



2. Nat. size. Part of tail and trunk in usual attitude. Same locality. M. CDS'-. 



3. Nat. size. Under viow of tail .showing the epimeia, the sternites pierced for articulation 



of pleopods, expanded tail fan, telson with accessory swimmerets. Same locality. 

 M. SSll":'. 



4. Nearly complete small indi\"idual, showing both trunk and tail in side view, with carapace 



in place exposing the terga of last two trunk segments in mid -line of back. Shows 

 rosti'um, eye, antennules, antenna with scale, trunk limbs tightly clenched and doubled 

 up in usual attitude, massive t.ail with characteristic overlapj)ing epimera, and tail fan. 

 Same locality. M. 2739^^. 



-5. Nat. size. Trunk and tail in usual attitude, displaced carapace with movable rostrum, 

 exposed trunk segments, trunk limbs clenched and folded up foi-ward, tail segments 

 with characteristic epimera, and telson with accessory swimmerets. Same locality. 

 M. 696''. 



Fig. G. Recent squillid, Gonodcwti/lus chiragra Latreille, for comparison (nat. size) . . Page 48. 



Fig. 6a. P>roken-ofl" raptorial limb of fig. 6. 



Fig. 7. Tail of fig. fi drawn in same attitude as fig. 3 foi' comparison. 



Figs. 8-14. Perimecturas ensifer sp. nov. . . . . . . . . . . . . Page 49. 



8. Nat. size. Trunk and tail of -small specimen seen from beneath. Shows carapace with leaf- 



like rostrum, sternites of trunk and tail, epimera of tail segments, and expanded tail fan. 

 Locality, Glencartholm, Langholm, Dumfriesshire. M. 41.5''. 



9. Nat. size. Tail and tail fan. Figured liy E. Etheridge, jun., as Dithyrocaris s)!. ind., 



Quart. Journ. Geol. Soc, 1879, vol. xxxv.. pi. xxiii., fig. 2. Loeality, Liddel Water, 

 half-.a-mile below New C'astleton, Roxburghshire. M. 4260'-. 



10. Nat. size. Tail and tail fan in side view, detached sense organs of head, eyes, antenuular 



peduncle, antenna, and .scale. Same locality. M. 4882*''. 



11. N.at. .size. Part iif tail and fan of larger individual. S.ame locality. M. 42G7". 



12. Nat. size. Part of tail with telson .showing characteristic urnnnient. Figured by K. 



Etheridge, jun., foe. cii., fig. 3. Same locality. M. 4265''. 



13. Telson of another individual, seen from beneath. Shows accessory swimmerets, two on one 



.side. Same locality. M. 4883'\ 



14. Part of fig. 13 enlarged. 



