7p 
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 other 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 
extend 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. ro. 
Cryptonymus deltoides, Vogdes, Mong. genera Zethus, &c., p. 21. 
Encrinurus 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 
granules. Pleurae, 8. 
This species is related to E. sex-costata, Salter, from which it differs 
in the greater number of pleurae and axial rings. 
ENCRINURUS BARRANDEI, DeKonick, Resch. Pal. Foss. Sud Aust, p. 
Fie late de tomo: 
Trans. Mem. Geol. Sur. N. S. Wales, Palaeont, No. 6, p. 40, plate 1, fig. 8. 
Head and tail only known from Yarralumla. 
The head is similar to £. punctatus; it is, however, a little broader; 
the glabella less convex. The occipital furrow faintly marked; genal 
angles are rounded. 
Pygidium subtriangular, slightly broader than long. ‘The axis has 
25-26 joints, not tuberculated. Pleurae 9, smooth; no caudal spine. 
ENCRINURUS MrTrcHELLI, Foerste, Bull. Denison Univ., vol. 3, p. 124, 
Plate XV, figs. 2, 3 and 20. 
The author illustrates the glabella fixed, and free cheeks, thorax and 
tail. The thorax has 12 segments. Pygidium 9-10; pleurae smooth, 
and 28 axial joints, notched at the sides, with a central row of nodes. 
No caudal spine indicated. Silurian of Australia. 
ENCRINURUS 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, extending 
across it, with a central row of nodes. Pleurae, 7-8; first 5 obtusely 
rounded, the last 2 spinous. Surface granulated. 
Dist. of Siljan Dalecarlia. 
