PLATE XV., OSTRACODA AND AGNOSTUS (part). 
Fie. 1. Lepiditta alata. a, outer surface of left valve. 0, cast of interior 
of right valve. Mag. #°. From Div. 1 c?, St. John, N. B. See p. 194. 
Fia. 2. Lepiditta curta. Interior of left valve. Mag. 12. From Div. 1 d'. 
St. Martin’s, N. B. See p. 195. 
Fic. 3. Lepiditta auriculata. a, left valve showing faint concentric lines 
and the ligamental (?) groove at the hinge. 6, same, hinge line in profile. 
Mag. ¢. From shales of Div. 1 ¢, St. Martin’s. See p. 196. 
Fie. 4. Aluta flexilis n. g. et sp. left valve (with lower margin restored ) 
showing ocular (?) tubercle, Mag. ¢. From conglomerate limestone band 
in Div. 1 c!, St. Martin’s, N. B. See p. 198. ; 
Fic. 5. Primitia Acadica. a, left valve. 6, longitudinal section. ¢, trans- 
verse section. Mag. $¢. From Div. 1 c!, St. Martin’s,"N. B. See p. 196. 
Fic. 6. Agnostus fallax var. vir. Complete, somewhat flattened. Mag. ?. 
From Div. 1 c?, St. John, N. B. See p. 215. 
Fic. 7. A. fallax var. concinnus. a, head shield. 6, a joint of the thorax. 
c, Pygidium. Mag. ?. From Div. 1 d!, St. Martin’s, N. B. Seep. 216. 
Fia. 8. Same variety. «a, head shield of young larva retaining embyonic 
(Protaspis-like) features. Mag. 4°. 6, young pygidium showing somites 
and posterior tubercle on rachis, effaced in later stages. Mag. 4°. Both 
from Div. 1d', St. Martin’s, N. B. See p. 216. 
Fig. 9. A. fallax var. trilobatus, n. var. Pygidium. Mag. #. From 
Div. 1 c!, St. John, N. B. Seep. 216. 
Fig. 10. Agnostus Acadicus, Hartt. a, head shield. 06, pygidium. 
Mag. 3. From Div. 1 c!, St. John, N. B. Seep. 217. 
1 
Fic. 11. <A. Acadieus var. declivis. a. head shield. 0b, pygidium. 
Mag. +. ce, larval pygidium showing embryonic features. Mag. 4°. d, 
adult pygidium in the rachis of which are six somites. Mag. ?. All from 
Diy. 1 d', St. Martin’s, N. B. See p. 219. 
