84 G. P. MATTHEW: ILLUSTRATIONS, ETC. 



Fig. 19. — Hlpponkharivn to.", n- gen. et .sp., |, right vulve. — lOa, longitudinal section. — 19'j, transverse section. 

 From Div. 1.6'. See p. 64. 



Fig. 20. — Beijnchona papilio, n. gen. et sp., ^, both valves. — 20a, tran.sverse section of the two valves. From Div. 

 l.hK See p. 05. 



Fig. 21. — Beyrirhona tiiua, ii. sp., -j, right valve. — 21f(, longitudinal section. — 21b, transverse section. From Div. 

 1.6 . See p. 66. 



Fig. 22. — Primilia AcaJica, n. sp., t, right valve ? — 22«, longitudinal section. — 226, transverse section. From Div. 

 l.c'. See p. 66. 



Plate VII. 



Fig. 1. — Agnodus nguJui', n. sj)., -|. — 1", head shield. — 16, pygidium. — Ic, liist segment of the thorax. From Div- 

 1.C-. See p. 67. 



Fig. 2. — Agnostus parlitus,n- sp., -}■ — 2a, head shield. — 26. pygidium found witli this species, aud supposed to belong 

 to it. From Div. l.c'. See p. 68. 



Fig. 3. — Agnostits rir, n- sp., ^ somewhat flattened, complete test. From Div. l.c. See p. 60. 



Fig. 4. — Agrioshm rir, var. covcinnu», ?. — ia, head shield. — 16, pigidium. — ic, first segment of the thorax. From 

 Div. l.rf. See p. TO. 



Fig. 5. — Agno-itus Acadicus, Hartt, 'J. — 5a, head shield. — 56, pygidium. From Div. l.t-. See p. 70. 



Fig. 6. — AgnoslwiAc(.idkm,\a,T.d(cliru,\\.\a.r. ]. — fi«, head shield. — G6, ijygidium- From Div. 1. '7. See p.VO. 



Fig. 7. — Agnostu.i tesseHa, n. sp-, Î. — 7a, head shield.— 76, )iygidiuin.--7c, segments of the thorax. From Div. l.d. 

 See p. 71. 



Fig. S. — Agnoflux umbo, n. sp., î. — Sa, head .shield. — 86, pygidium. From Div. l.d. See p. 71. 



Fig. 9. — Agnostus oblimlobus, n. sp., t, complete test. From Div. l.d. See p. 72. 



Fig. 10. — Agno.^us aciilUobua, n. sp., t, complete test. From Div. l.d. See p. 73. 



Fig. 11. — Microdiscus Dawsoni, Hartt, î.^llo, head shield. — 116, same seen in profile. — lie, pygidium. From Div 

 1.C-. See p. 75. 



Fig. 12. — Microdiscus punctalm, Salter, \a.T. pidchellvji, Hartt, \. — 12n, head shield. — 126, same (flattened anteriorly) 

 seen in profile. — 12f, pygidium. From Div. 1.6. See p. 74. 



Fig. 13. — Microdiscus puncialwt, var. precursor, n. var., j, head shield. From Di\-. l.c-. See p. 75. 



Fig. 14. — Agraxdos (?) (irticepli'dus, n. sp., ;. — 14a, head shield. — 146, seven segments of tlie thorax. From Div. 

 1.6.'' See p. 75. 



Fig. 15. — Solmnpkura Acadica, n. sp., Whiteaves, ^ head-sldeld, pleura and pygidium restored. From Div. l.d. 

 See p. 76. 



Fig. 16. — Pin(ido:rid''s Acadieux, var. Suricn^, n. var., 1, head-shield. From Div. l.c'. See p. 77. 



Fig. 17.— Purado.vidcs Abenacvs, n. sp., t head shield of small individual, narrow form. — 17a. head shield ( j) of broad 

 form, slightly distorted. — 176, hyjmstome (1) of broad form. — 17c, pygidium (',) of narrow form, partly 

 exfoliated and shewing concentric strife of the underside.— 17(?, pygidium of the broad form (?) \. All 

 from Div. l.(/. See p. 78. 



Fig. is.— Paradoxides Micmac, Hartt, ', bead shield of a small individual, showing the (inely striated anterior mar- 

 ginal fold, and front and sides of the glabella; also the rugulo.se cheeks and long eyelobes. From Div. l.c. 

 Sec p. 80. 



