76 
The glabella is inflated, clavate, covered with large tubercles. Ina 
specimen from Bowning, N. S. Wales, now before me, the thorax has r1 
segments; it does not show the ends of the pleurae. Pygidium one-third 
wider than long; it has 1o pleurae. ‘The axial joint, 18 or more; the 
first ro are entire and extend across the axis to opposite the 8th pleurae; 
the other notched at the sides; the centre is smooth and ornamented by 
4 nodes on the 2nd, 3rd, 6th and oth joints. 
ENCRINURUS TUBERCULATUS, Collie, Bull. Geol. Soc. Amer., vol. 14, 
p- 418, Plate LIX, fig. 3, Oct. 19, 1903. 
This name used by Buckland for a species, Bridgw. Treatise, 1837, 
for the species now known as £. punctatus. 
Enerinurus Indianensis, Kindle, Geol. Indiana, vol. 28, p. 482, plate 24, figs. 
14-15, 1904. 
The Indiana specimen exhibits the glabella, fixed cheeks and tail; 
the genal angles apparently terminating in short spines; the pygidium 
elongate-triangular, convex, with 15 axial joints extending across it, 
each joint ornamented by 3 to 5 nodes. Pleurae ro (fig. 15, plate 24, 
only shows 8 or 9.) 
The Pennsylvania specimen has 25 axial joints, with 3 nodes on 
each joint; 8 pleurae. 
The number of axial joints and pleurae vary so much in species of 
this genus, that this slight variation discredits the value of such features 
for specific identification. 
Remarks on the genus Cromus Barrande : 
Certain species, which Barrande has placed under his genus Cromus 
Novak (Ges Wissensch Jahrg, 1886) has referred the older genus Encri- 
nurus, on account of the direction of their facial sutures, which are the 
same in both genera. They are: 
Cromus Braumonttl, Barr. Sil. Syst. Bohéme, p. 826, Plate XLIII, 
figs. 6-14. 
In which the genal angles of the head are rounded off; the glabella 
4-lobed; pygidium 15-20; axial joints with 1-4 tubercles on each ring; 
pleurae 12 tips, rounded. See plate 2, figs. 13-15. 
Cromus BoueEmicus, Barr, Sil. Syst. Bohéme, p. 828, Plate XLIII, 
figs. 15-17. 
In which the genal angles of the head are rounded off; pygidium 20; 
axial joints 12; pleurae ends ending in spines. See plate 2, figs. 20-21, 
CROMUS TRANSIENS, Barr, Sil. Syst. Bohéme, p. 828, Plate XLIII, 
figs. 18-19. 
In which the tail is triangular; pleurae 10-12; ends rounded off; 
axis 12-14; from 2-5 tubercles on each ring. See plate 2, figs. 16-19. 
