PLATE X—Continued. 
DICELLOCEPHATUS MUARIC Avenir ana cele ore lalals (sta eteremisicteiecleteieiomiaintas lets matalteteteteieintes =ttsteeeteeteeioret ate 
Fig. 18. Enlargement to three diameters of the central portions of the head. 
Fig. 14. Free cheek, associated with figs. 2 and 3. 
DICELLOCEPHALUS NASUTUS -..-.---------- go Soave vas aclesie ion clecins eect ee eee eae eel 
Fig. 15. Central portion of the head, showing the glabella and prolonged anterior border 
of the head. Natural size. 
CHARIOCEPHATLUS? TUMIRRONB spice oe cle ale = (ele seine sie metealele mele ate late ele ale la oelere ele lain oat se ala 
Fig. 16. Specimen showing the frontal margin, and a less protuberant frontal lobe to the 
glabella than in the type of the species, enlarged to two diameters. 
Fig.6. Pygidium associated with Chariocephalus tumifrons, and supposed to belong to the 
species. 
(POY CHOP AR TAGE AU V8 RES etal lalate alee a = ee eee ee ft 
Fig. 17. View of the central portions of the head, enlarged to three diameters, with the pos- 
tero-lateral limbs broken off. 
18. Free cheek, associated with the heads of this species and P. Oweni. 
JD olieifoyerbese MLO) WON aes secSeo Gobdos nS0bES saeco ocoassduobese noone gocestoscceé cooges ses5 
Fig. 19. View showing the strongly-marked features of the central portion of the head of 
the species, enlarged to two diameters. 
Fig. 20. Hypostoma, associated with fragments of a species of the genus Dicellocephalus, 
enlarged to three diameters. 
IRIE (0) BUNUN a Bio pa A eB Ob OS DOO OS OBS BO COS DOE CHORD GO DOORS OCS FOO Seo Sd cb ascocsnstecomsos 
Fig. 21. Strongly convex hypostoma, associated with Ptychoparia Oweni, enlarged to three 
diameters. 
Fig. 22, An hypostoma, similarly enlarged, associated with Ptychoparia anytus, P. Oweni, and 
P. leviceps. 
IPINY CHASPISUMINUMAtso ee wey cele cel ele cp alee wom cle cieteeia ce aaieleis eelseteee sine lieionintaele cata meletaeiata tener 
Fig. 23. Enlargement to four diameters of a head, showing the elahelia, fixed cheeks, ocu- 
lar ridges, and depressed frontal limb. 
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