PLATE VII. 



FIGS. PAGE. 



Parabolinella williamsoni (Belt). 64 



1. Enlargement of the tail of the specimen figured in Plate. VI, fig. 12, showing the conical 



termination of the axis. Upper Lingula Flags, MoelGron. Sedgwick Museum . x H . 



Parabolinella caesa, sp. nov. 6Q 



2. The only specimen known. Upper Lingula Flags, Dolgelly. British Museum, I. 722. 



Presented by Dr. Hicks, x lh. 



Parabolinella rugosa, Brogger, var. 67 



3. Cranidium. The somewhat tuberculate appearance seems to be due to little crystals of iron- 



pyrites which have been oxidised. Tremadoc Slates, Nant-y-Glasdwr near Carmarthen. 

 Sedgwick Museum. (Figured by Misses Crosfield and Skeat, Quart. Journ. Geol. Soc, 

 vol. lii, pi. xxvi, fig. 11.) x 1|. 



Parabolinella triarthra (Callaway). 68 



4. A large specimen. Shineton Shales, Shineton Brook, near Cressage. British Museum, 



I. 7533. Nat. size. 



5. A specimen of average size : the twenty-first thoracic segment appears to be present, but is 



not very clear. Shineton Shales, Shineton. Sedgwick Museum, x If 



6. Another specimen, with twenty-one thoracic segments. Shineton Shales, Shineton. Sedgwick 



Museum, x If 



7. Specimen with free cheeks attached. Shineton Shales, Shineton. Sedgwick Museum. 



Presented by Dr. T. Groom, x If 



8. A large cranidium. Shineton Shales, Belswardine Brook, near Shineton. British Museum, 



I. 14562. (The counterpart of this specimen is in the Sedgwick Museum.) x If 



9. Impression of a smaller cranidium, showing the glabellar furrows very perfectly ; the surface 



is distinctly punctate. Shineton Shales, Shineton. Sedgwick Museum. Presented by 

 Dr. T. Groom, x If 



10. Probably a young form. Shineton Shales, Shineton. Sedgwick Museum. Presented by 



Dr. T. Groom. x If 



11. Cranidium similar to that of fig. 10. Shineton Shales, Shineton. Presented by Dr. T. 



Groom, x If 



12. Young form, probably of this species, with about eight thoracic segments. Shineton Shales, 



Shineton. Sedgwick Museum. Presented by Dr. T. Groom, x 6. 



Triarthrus shinetonensis, Eaw. 70 



13. A nearly perfect specimen of thorax and head with free cheeks attached. Shineton Shales, 



Shineton. Sedgwick Museum, x 2. 



14. External cast, showing the impressions of the median tubercles or spines. Shineton Shales, 



Shineton. Sedgwick Museum, x 2. 



15. Thorax and tail, with parts of free cheeks, and hypostome. Shineton Shales, Shineton. 



Sedgwick Museum, x 2. 



16. Tail and part of thorax. Shineton Shales, Shineton. Sedgwick Museum, x 2. 



