ap 
the upper one-third becomes flatter, and the rings are effaced along the 
middle. No nodes along the smooth central portion. 
Pleurae 6, strongly indicated, divided from each otirer by narrow, 
deep furrows; ends squarish and obtuse. ‘The upper four pleurae are 
free, but the two others are fused with those from the opposite side and 
€xtend in a very blunt point beyond the tip of the axis. 
Llandeilo Flags, North Wales. 
ENCRINURUS DELTOIDES, Shumard, Geol. Missouri, p. 198, Plate B, fig. 10. 
Cryptonymus deltoides, Vogdes, Mong. genera Zethus, CC. Hi 21, 
NHacrinurus deltoides, Foerste, Bull. Denison Uniy., vol. 2, p. 102, 
"Keyes, Geol. Missouri, vol. 4, Palaeont, p. 229, 
The description of this species was drawn froma pygidium, Silurian 
of Cape Gardeau, Mo. 
Pygidium subtriangular; width greater than the length. Axis flat- 
tened, Convex, with 24 axial joints; the first 4 or 5 are entire, the others 
are interrupted in the middle of the axis and bear several very small 
stanules, Pleurae, 8. 
: This Species is related to E. sex-costata, Salter, from which it differs 
In th 
E © greater number of pleurae and axial rings. 
INC 
RINURUS BARRANDEI, DeKonick, Resch. Pal. Foss, Sud Ast, py 
61, Plate I, tg. &. 
 dtate, Mem. Geol, Sur. N. S. Wales, Palaeont, No. 6, p. 40, plate 1, fig. 8. 
Head and tail only known from Varralumla. 
The head is similar to 4. punctatus, it is, however, a little broader: 
the 8labella less convex. ‘The occipital furrow faintly marked; genal 
Angles are rounded, 
Pygidium subtriangular, slightly broader than long. ‘Ihe axis has 
ee joints, not tuberculated. Pleurae 9, smooth; no caudal spine. 
ENcRInuRUS MrrcHELLt, Foerste, Bull. Denison Univ., vol. 5; D: 124, 
Plate XV, figs. 2, 3 and 20, 
The author illustrates the glabella fixed, and free cheeks, thorax and 
The thorax has 12 segments, Pygidium 9-10; pleurae smooth, 
And 28 axial joints, notched at the sides, with a central row of nodes. 
ING Gana. fee es i ‘ 
Caudal Spine indicated. Silurian of Australia. 
in 
tail, 
betitaes SCHISTICOLA, Tornquist, Sv. Geol. Under. Ser. C, No. 66, 
p. 23, Plate I, figs. 15-17. 
The author illustrates the glabella, part of the thorax and tail. 
The head has the genal angles produced into short spines. The 
Pygidium triangular, with a caudal spine. Axis 14-16 joints, extehding 
cross it, with a central row of nodes. Pleurae, 7-8; first 5 obtusely 
Tounded, the | 
ast 2 spinous. Surface granulated. 
Dist. of Siljan Dalecarlia, 
