PLATE XXVI A. 
Stylonurus excelsior. 
Pages 156, 221. 
See Plate 26. 
1. The lower surface of the type specimen of DoLlchocephala Lacoana, Claypole,-showing portions 
of the cephalic appendages. These have all been pushed somewhat forward from their pi-oper 
position beneath the carapace, but as far as they ai'e retained, appear to lie noi-mally with 
reference to one another. The restored pai-ts, whei’e their outline is not indicated by the 
specimen itself, are drawn from figures of /Stylonurus given by Woodward (Palseontographical 
Society, 1872). 
A. A fragment of an appendage preserved as an impression upon the edge of the slab, and di-awn 
in from a gutta-percha cast It probably represents a portion of a longtii’st paii- of gnathopods. 
B. The right member of the second pair of gnathopods, showing the long basal joint, a portion of 
which is buried beneath the matrix, its denticulate mandibular edge, and the long recurved 
palpus. A portion of the basal joint of the left member of this pair is also visible. 
C. A chelate terminal joint, possibly belonging to the first paii- of appendages. 
D. The basal joint of the left member of the third pair, showing the double lamellate mandibular 
processes. 
E. A portion of the basal joint of the left member of the fourth pair, showing the mandibular 
margin. 
F. The left basal joint of the fifth pair of gnathopods, showing the broad surface, the conspicuous 
mandibulai- denticles, and the prominent surface of articulation. 
G. The position of the mouth. 
H. The outline of the carapace as it lies on the othei- side of the specimen. 
2. The tei'ininal portion of the median dorsal ridge, drawn from the same specimen, showing- the 
ocelli, which are sepai-ated by a sharply impi-essed line and are slig-htly distorted. No evidence 
of this feature is shown upon the specimen represented on plate 26. 
3. A portion of the carapace, natural size, showing the conspicuous, elongate tubercles, and, over the 
surface where the thin o-ust has been removed, impressions of the sharply defined, semicircu¬ 
lar squamge upon its lower side. 
Catskill gi-oup. Meshoppen, Wyoming county, Pennsylvania. 
