DESCRIPTION OF GENERA AND SPECIES. T45 
[Angelin, pl. 18, fig. 5]. The spine of Ampyx acuminatus is in well-preserved 
examples longer than in Angelin’s illustration. The species reminds one most of 
Ampyx nasutus Dalman (Orthoceras limestone).” 
Doctor Frech in his statement appears to have overlooked the fact that the 
spine of the genus Ampyx is a spinose extension of the front of the glabella, while the 
nasute projection of the frontal rim of Anomocare acuminatum is from an entirely 
different division of the cephalon of the trilobite and in no way can be correlated 
or compared with the glabella of Ampyx. On this account it is unfortunate that 
the name Proampyx was given. 
A similar nasute projection of the frontal border occurs on the cephalon of the 
trilobite described as Ptychoparia ? pernasutus Walcott [1884, p. 49, plate 10, figs. 8, 
8b]. The glabella of the latter species is quite unlike Proampyx acuminatum, being 
more like that of Proampyx burea. On this account it is doubtfully referred to 
Proampyx, until a further study can be made of all the forms in which the frontal 
border is extended into the nasute projection. 
Proampyx burea (Walcott). 
Plate 14, Figure 3. 
Ptychoparia (Proampyx) burea WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xxrx, p. 86. (Described 
as a new species.) 
Cephalon, exclusive of the free cheeks, quadrilateral in outline, convex. Gla- 
bella convex, truncato-conical in outline, with the front broadly rounded; surface 
marked by two pairs of faintly indicated furrows; occipital furrow rounded, narrow, 
and distinct; occipital ring narrow at the sides, of medium width, and slightly con- 
vex toward the center; dorsal furrow of medium width, rather deep, and distinct. 
Fixed cheeks convex, narrow, and about one-fourth the width of the glabella at 
the palpebral lobes; they slope gently back to the postero-lateral limbs, and abruptly 
downward in front of the narrow, rounded palpebral ridge to the frontal limb; 
postero-lateral limbs short, marked by a shallow furrow parallel to the margin; 
frontal limb short, and rising a short distance in front of the glabella into a nasute- 
like extension of the frontal rim, which rises up in front of the head; to the sides the 
frontal limb slopes abruptly downward and forward, forming a deep, wide groove 
with the frontal rim; frontal rim not separable from the frontal limb at the sides, 
but rising immediately in front of the glabella into a broad, nasute-like process, the 
height of which is unknown. 
Surface unknown, except on the occipital ring, where it is marked by irregular, 
raised, inosculating lines that give it a granulose appearance. 
The type and only specimen of the cephalon in the collection has a length of 
10 mm., exclusive of the nasute-like projection on the frontal rim. 
This species is clearly distinguished by the nasute-like projection on the frontal 
rim. It differs from Proampyx acuminatum [Angelin (1854), 1878, p. 26, plate 18, 
fig. 7] in a short frontal limb and the form of the nasute projection; also in the form 
of the glabella and other parts of the central portion of the cephalon. 
Formation and Locality——Upper Cambrian: (C61) A dense black limestone in 
the uppermost limestone member of the Kiu-lung group [Blackwelder, 19074, pp. 37 
and 41 (third list of fossils), and fig. 10 (bed 13), p. 38], 3 miles (4.8 km.) southwest 
of Yen-chuang, Shan-tung, China. 
Collected by Li San. 
