242 Mr. A. Gr. Butler on four new Species of 



back of the stipe, and attaining an extraordinary length as 

 compared with their breadth. 



Log. Rare in the upper beds of the Skiddaw Slates, Eller- 

 gill, near Milburn, Thornship Beck, near Shap, and Eggbeck, 

 near Poolej. 



EXPLANATION OF PLATE XI. 



Fifi. 1. Specimen of Dichoc/rapsus fragilis, n. sp., nat. size. 



Fie/. 2. The same, enlarged. 



Fig. 3. Portion of the same, enlarged still further, to show the cellules. 



Fig. 4. Portion o£ Dichograpsus annulaitts, n. sp., showing the transverse 



ridges. 

 Fig. 5. Portion of the same, enlarged. 

 Fig. 6. Trigonograpsiis lanceolatus, n. sp., enlarged. 

 Fig. 7. Diplograpsus Hopkinsoni, n. sp., enlarged. 

 Fig. 8. Diplograpsus armatus, n. sp., enlarged. 

 Fig, 9. Portion of Diplograpsus Hughesi, n. sp., greatly enlarged, to show 



the cellules. 

 Fig. 10. Diplograpsus Hughesi, enlarged. 

 Fig. 11. Diplograpsus sinuatus, n. sp., enlarged. 

 Fig. 12. Diplograpsus bimucrotiatiis, n. sp., enlarged. 

 Fig. 12'. Fragment of another specimen of D, himucronatus, enlarged, to 



show the cellules. 

 Fig. 13. Diplograpsus insecfiformis, n. sp., enlarged. 

 Fig. 14. Upper portion oi Diplograpsus vesiculosus, n. sp., slightly enharged. 



(The serration of the margin in this figiu-e is too pronounced.) 

 F^g. 15, Portion of D. vesiculosus, enlarged, showing the cellules, axial 



tube, and base. 

 Fig. 16. Climacograpsus innotatus, n. sp., enlarged. 

 Fig. 17. Portion of C. itmotatus, greatly enlarged, to show the cellules. 

 Fig. 18. Climacograpsus tuherculahis, n. sp., enlai'ged. 

 Fig. 19. Graptolites argenteus, n. sp., enlarged. 

 Fig. 20. Didymograjjsus qffinis, n. sp., enlarged. 

 Fig. 21. Didymograpsus fasciculatus, n. sp., enlarged. 

 Fig. 22. Portion of D. fasciculatus, still further enlarged, to show the 



cellules. 



XXVIII. — Descriptions of four neio Species of Diurnal Lepido- 

 ptera of the Genus Thyca. By A. G. Butlee, F.L.S. &c. 



Genus Thyca, Wallengren. 



1. Thyca Ithiela^ sp. nov. 



S . Alae supra nigrae : antiese velut in T. Horsfieldii cinereo plagatae 

 et maculatae : posticse macula magna subcostali subovali aureo- 

 flava apud basin posita, maculis quinque discalibus, serie an- 

 gulari velut in T. Horsfieldii positis, maculisque quinque cine- 

 rascentibus semicircularibus submarginalibus ; area abdominali 

 cinerea, baud flavo maculata : corpus nigro-cinereum, antennis 

 nigris. 



Alas subtus fere velut in T. Horsfieldii, macuHs autem posticarum 



