PROCESS-BLOCKS AND OTHER ILLUSTRATIVE FIGURES, 
Fig. 
Do 
BESIDES THOSE IN THE PLATES, 
Pace 
Cardiocarpus, Sp. Nat. S1Z@ ......1...essseeceeeceteesecneneeeeesees 20 
Outlines of fragments of pumice in siliceous sinters............... 30 
Section in the Towy Valley at Drysilwyn ................csseeeeeces 30 
Microscope-sections showing spheres of calcium-carbonate & 
botryoidal groups of the same.............. Bpuopricechadcoce eran 52 
Microscope-sections showing modified crystals of calcium- 
carbonate and nodules: of the same......5.200..sccsscscecsesesosess 54 
Concretions of calcium-carbonate produced by the action of 
bacteria, upon ealemna-sulphatejn.. 12.0. ..essedoaee csnsedeant se 56 
Head-shield and pygidium of Lichas palmatus, Bary........6t+- (G: 
Do. Do. (Pie SCT OR USIE et bois a letecmacnio she 72 
Do. Do. of L. margaritifer, Nieszk. ......... UD 
Head-shield of ie UCPTINEOSIIS; LENG 6 acs honae em cte seat teh s stinsce 73 
Pyeidinna Ol 25 a fits; AMES (erases jetdcrine nee opie areitneesahes 73 
Head-shield and pygidium of L. cicatricosus, Schmidt ......... t4 
Pygidium of L, hibernicus, Portl. pars .....0.c.:01.0cecsenssecenees 74 
Prati op De fiverrot, Welgr . - F2.ce ne. aren rcleaeutiese tes rons ednne 75 
Head-shield and pygidium of L. armatus, Goldfuss............... 795 
Do. Do. of L. ornatus, Ang Sere eee ee seats 76 
Do. Do. of L. tricuspidatus, Beyr. ............ 77 
Do. Do. ot I, depressits, Ang. ...5......- ayn 78 
Hlend-sliteld Gil @naustis, (BOW ee i) eas icccca er corre tesw sense dies st 78 
Pygidinm of Li, Wefleaus, SjOSt nl... si ese ccee ene nn eee nennnesness 18: 
Head-shield and pygidium of L. e@quiloba, Steinh. ............... 79 
Do. Do. of L. ilenoides, Nieszk..............05. 80 
