Stylonurus? limbatus nov. 
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I Specimen showing the visual surface, but no border. Natural size 
2 Large carapace showing the eye nodes and visual surfaces and marginal 
border. Type of species. Natural size 
3 Smaller carapace well exhibiting the concentric striation of the border 
and showing traces of ornamentation. Natural size 
4 Small, broader carapace, referred with doubt to this species. x 2 
5 Long carapace, apparently somewhat laterally compressed, showing 
triangular scales along posterior margin; probably belonging to a dif- 
ferent species. Natural size 
Horizon and locality. Lower Siluric: Schenectady shale. Originals of 
figures 1-4 from Dettbarn quarry, Schenectady, that of figure 5 from 
Duanesburg, Schenectady co. 
Stylonurus, disjecta membra 
6 Fragment of abdomen, showing tergites with an elevated medio-trans- 
versal region bearing broad, flat nodes; possibly belonging to Sty - 
lonurus limbatus. Natural size 
7 Patch of integument with slender spines, possibly belonging to a Sty- 
lonurus. X 5 
8 Patch of integument with closely arranged mucros, possibly belonging 
to the carapace figure 5. xX 5 
g Articulation with parts of two slender segments suggesting the walking 
leg of a Stylonurus. Natural size 
10 Fragment of a leg with peculiar ornamentation consisting of a lattice 
work of sharply raised straight lines. x 5 
Horizon and locality. Lower Siluric: Schenectady shale, figures 6, 7, 8, 
ro from Dettbarn quarry, figure 9 from Aqueduct, near Schenectady 
Hughmilieria magna nov. 
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rr Small carapace, well retaining the probable original form and the 
lateral eyes. Type of species. Also showing traces of ocelli. Natural 
size 
12 Carapace of very young (neanic) individual, showing the larger size 
of lateral eyes. x 2 
13 Specimen retaining besides carapace portion of abdomen and swimming 
leg. The carapace shows faintly two lateral eyes well within the 
margin. The segments of the swimming leg are indistinct save the 
last two. Natural size 
14 Small carapace which apparently has suffered but very little distortion 
and shows the intramarginal position of the larger lateral eyes. Nat- 
ural size 
15 Larger carapace in which the lateral eyes have been pressed outwards. 
Natural size 
610 
