246 TRANSACTIONS OF THE [may 18, 
Fig. 2. S. concentrica var. radiata. Mag. 1°. From Div. 1e, St. John, N. 
B. See p. 202. 
Fic. 3. Stenotheca Hicksiana. Mag. 7. From Div. 1d', St. Martin’s, N. 
B. Seep. 205. 
Fia. 4. Stenotheca triangularis. a, a cast of, showing the outline of the 
cone and the thickened apex. 6, a cast without the outline. Both 
mag. ¢. From Div. 1 ¢?, St. John, N. B. See p. 203. 
Fic. 5. Strobilepis spinigera, J. M. Clarke. Terminal plate (and penulti- 
mate plate in outline). Figured for comparison from Dr. Clarke’s restora- 
tion. Mag. 3. The terminal plate is partly covered by the penultimate. 
Devonian species. See p. 203. 
Fia. 6. Stenotheca nasuta. a, small example, mag. §. 6, original type 
mag. ?. Both from Div. 1c, St. John, N. B. Seep. 204. 
Fic. 7. Plumulites Manuelensis, n. sp, mag. +. From Div. 1d’, Manuel 
Brook, Newfoundland. See p. 200. (Misprinted Plate XV. on p. 200.) 
Fic. 8. Cirripedian and other plates. Type A, a and J, two forms of oval 
plates. Type B, a, ribbed plate ; b, smooth plate. Type C, a, plate with deep 
furrow ; b, plate with high umhbo; c, plate with eared fiange ; d, plate simi- 
larly flanged but more regular ; these are perhaps Cystidian. Type D, sym-. 
metrical plate, perhaps one of the axial row of plates. Type E, triangular 
plate with radiating ridges (possibly cystidian). Type F, triangular plate 
with arched keel ( Cirropodites Cambrensis). Type G, triangular plate with 
facetted edges. All the figures except 8 G, a, mag. { 8 G, a, is mag. ¢. The 
narrow figures beside the larger ones are sections. See p. 206. 
PLATE XV., OsTRACODA AND AGNOSTUS (part). 
Fig. 1. Lepiditta alata. a, outer surface of left valve. 0, cast of interior 
of right valve. Mag. 4°. From Div. 1c’, St. John, N. B. See p. 194. 
Fia. 2. Lepiditta curta. Interior of left valve. Mag. 1°. 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. 
Fic. 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. 
Fia. 5. Primitia Acadica. a, left valve. b, longitudinal section. c, 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. 
Fia. 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. See p. 216. 
Fic. 8. Same variety. a, head shield of young larva retaining embyonic 
(Protaspis-like) features. Mag. 2°. b, young pygidium showing somites 
and posterior tubercle on rachis, effaced in later stages. Mag. 14°. Both 
from Div. 1d', St. Martin’s, N. B. See p. 216. 
Fie. 9. A. fallax var. trilobatus, n. var. Pygidium. Mag. }. From 
Div. 1c}, St. John, N. B. Seep. 216. 
Fia. 10. Agnostus <Acadicus, Hartt. a, head shield. 6, pygidium. 
Mag. ?. From Div. 1 c', St. John, N. B. Seep. 217. 
