428 REPORT— 1890. 
closely approaches it in form, but surpasses it greatly in size, and differs 
somewhat in the curvature of the antero-ventral and posterior margins. 
§ 3. Scotch Carboniferous Estherie.—In our Seventh Report, 1889, 
reference was made to some fossil Phyllopoda from the Glasgow Coal- 
field (p. 66). In a memoir on these fossils, communicated by one of us to 
the Geological Society of Glasgow (‘Transact.’ vol. ix. part i. 1890), the 
following determinations have been arrived at :— 
(1.) Bstheria Youngii, sp. nov. (pl. 5, fig. 1), from a shale of the Car- 
boniferous Limestone (Upper Limestone series) at the Arden Quarry, 
near Thornliebank, four miles 8.W. of Glasgow. In the University Museum, 
‘Glasgow. 
(2.) Hstheria tessellata, sp. nov. (pl. 5, figs. 2-4:), in Cannel-coal, pro- 
bably from Ayrshire. In the British Museum. 
(3.) Estheria tegulata, sp. nov. (pl. 5, figs. 5, 6), in Cannel-coal, pro- 
bably from Airdrie, Lanarkshire. In the University Museum, Glasgow. 
(4.) The specimens from Thornliebank and Dalry, formerly referred to 
Estheria, under the name of H. punctatella, Jones (‘ Transact. Geol. Soc. 
Glasgow,’ vol. ii. 1865, p. 71, pl. 1, figs. 5, 5a), are now determined to 
belong to Posidonomya. 
§ 4, Another paleozoic (Devonian) Hstheria was noticed by Professor 
H. Rogers in his ‘Geology of Pennsylvania,’ vol. vii. part 2 (1858), 
p. 827, fig. 664, from the ‘ Cadent older or lower Black Slate,’ equivalent 
to the ‘ Marcellus Slate of New York.’ This Hstheria, though unnamed, 
should have been catalogued, with EH. pulex, Clarke, in our Sixth Report, 
‘Brit. Assoe. Reports,’ 1889, p. 181. 
EXPLANATION OF THE FIGURES 1—17. 
. 
(All the Outlines are of the Natural Size.) 
Fig. 1. Saccocaris minor, T.R.J. and H.W. Left valve and three abdominal 
segments. 
Fig. 2. Remains of a similar form lying close by. 
Fig. 3. Left valve, broad (or widened ?) in front and narrowed behind, but retain- 
ing a trace of the ogee curve; also some signs of abdominal segments. 
Fig. 4. Left valve and some abdominal segments. 
Fig. 5. Left valve, showing the posterior ogee curve. 
Fig. 6. Four abdominal segments, striated lengthwise. 
Fig. 7. Left valve, damaged or infolded at the antero-dorsal region ; with some 
abdominal segments. This forms part of a group with figs. 15, 16, and 17. 
Fig. 8. An obscure set of abdominal segments. 
Figs. 9, 10, and 11. A group of three left valves; fig. 9 has some abdominal seg- 
ments attached; and both figs. 9 and 11 show the ogee posterior curve. 
Figs. 12 and 13. Two specimens of obscure segments, too small apparently for 
any of the carapaces here outlined, and therefore indicating either younger forms 
or different species. 
Fig. 14. An imperfect valve, apparently with its dorsal edge downwards, but its 
abdominal segments in right position. 
Fig. 15. An oblong valve or carapace, with an obscure adjunct; followed by an 
imperfect set of six segments (fig. 16); and associated with another but modified 
valve, fig. 17 : fig. 7 also occurs in the same group as placed on the plate. 
