Vol. 69.] OF THE COMLET BkECCIA-BED. 43 



Fig. 7. Drawn from plasticine mould of part of an anterior thoracic segment ; 

 X 2 ; [specimen not preserved]. 



8. Fragment of a posterior pleura [1455], with the probable position of 



the pygidium indicated by dotted lines ; X 2. 



9. Internal cast of pygidium [1445] ; X 2. 



10. Exterior of pygidium [1443]: «, view from above ; 6, side view : both 



X 2; c, surface of axial lobe; d, surface of margin: bolh X 

 about 7. 



11. Internal cast of pygidium with a proportionately shorter axis, but 



probably belonging to the species [1817]: a, view from above,, 

 showing also the external cast of the wide doublure ; b, side view 1 

 c, view from behind ; all X 2. 



Agraulos sp. indet. No. 1. (See p. 32.) 



12. Internal cast of cranidium [1878 c]. The occipital spine, which is- 



restored in outline, was destroyed during development of the fossil ; 

 it was in close agreement with that showu in fig. 13: a, view from 

 above ; b, side view ; c. view from behind ; all X 3. 



13. Fragment of glabella and occipital spine [1398] ; X 3. 



Agraulos sp. indet. No. 2. (See p. 32.) 



14. Internal cast of cranidium [1847] : a, view from above ; b. side view; 



c, view from behind ; all X 3. The three pairs of glabellar furrows, 

 the contour of the glabella in the side view, and the absence of all 

 trace of ocular ridge, differentiate this form from that shown in 

 fig. 12. 



Agraulos cf. quadrangidaris (Whitfield). (See p. 31.) 



15. Internal cast of cranidium [1395]: a, view from above; b, side view; 



c, section between the eye-lobes ; all X 3. 



Ptgchnparia (Liosfracus) lata, sp. nov. (See pp. 38-39.) 



16. Internal cast of cranidium [1403], showing traces of two pairs of 



glabellar furrows : a, view from above ; b, side view ; c, view from 

 behind ; all X 2. 



17. Internal cast of cranidium [1399] without glabellar furrows : a, view 



from above,; b, side view ; c, section between the eye-lobes; all X 2. 



Plate III. 

 [All the figures are enlarged.] 

 Dorypygc reticidata, sp. nov. (See pp. 33-37.') 

 Fig. 1. Internal cast of cranidium [1407] : a, view from above, with free 

 cheek restored in outline, X 2 ; /;, part of the exterior of the test from 

 specimen [1411], fig. 5, X 10; c, part of the external cast of the 

 test [1408], which is the counterpart of [1407], X 10. 



2. Partial internal cast of cranidium, with the test preserved on the 



right side of the glabella, where the rugosities are interrupted in 

 two places marked X [1882] : a, view from above ; b, longitudinal 

 section ; X 2. 



The spine was destroyed during the development of the fossil,, 

 and the cast of the nether side of the occipital ring was then exposed. 



3. Internal cast of cranidium [1886] : a, view from above ; b, side view - r 



c, view from behind ; all X 2. 



4. Glabella of the smallest individual found [1415] ; X 2. 



5. Photograph of exterior of fixed cheek and eye-lobe (with the postero- 



lateral margin pushed out of place bj' a vein of calcspar), showing, 

 with a magnifier, the surface-characters [1411] ; X 2. 



6. Internal cast of free cheek [1410], as seen lying in the rock ; X 2. 



7. External cast of the same free cheek [1414]; x 2. 



