144 RESEARCH IN CHINA. 
gradually increasing in width toward the center, where it is slightly convex, and 
marked at the center by a minute, sharp tubercle; dorsal furrow strong and rather 
deep about the glabella. 
Fixed cheeks about the same width as the glabella, moderately convex; they 
slope gently from the dorsal furrow to the palpebral lobe, and backward to the fur- 
row of the postero-lateral limb; in front they slope rather rapidly and merge into the 
frontal limb; palpebral lobes small and situated about their own length from the 
posterior margin of the cephalon; palpebral ridge very faint, scarcely perceptible 
except by turning the specimen in the light; frontal limb slightly convex, sloping 
gently downward, and divided midway by a longitudinal furrow that extends from 
the front of the glabella te the furrow within the frontal rim; each side of the longi- 
tudinal median furrow the frontal border extends outward and backward, merging 
into the fixed cheeks without any interruption in the convexity of the slope; frontal 
rim narrow, nearly flat, and separated from the frontal limb by a very shallow 
groove which is little more than a change in slope of the frontal limb to the nearly 
flat frontal rim; postero-lateral limbs very short. 
Surface minutely granulose under a strong lens, with a few scattered, larger 
granules. 
The largest cephalon of the species in the collection has a length of 4 mm., with 
a width at the palpebral lobes of nearly 5 mm. 
This species is characterized by the longitudinal furrow in front of the glabella, 
which resembles the longitudinal furrow frequently seen in the frontal limb of the 
cephala of Agnostus. 
Doctor Monke describes and illustrates a free cheek and two pygidia that he 
assigns to this species. He does not make comparisons with other genera, as he evi- 
dently planned to refer the genus again in a future contribution to the subject. 
Formation and Locality —Middle Cambrian: (C6) Thin, platy limestone in the 
upper shale member of the Kiu-lung group [Blackwelder, 1907a, pp. 37 and 41 (sec- 
ond list of fossils), and fig. 10 (bed 12), p. 38], 2.5 miles (4 km.) southwest of Yen- 
chuang, Sin-t’ai district, Shan-tung, China. 
Collected by Eliot Blackwelder. 
Doctor Monke’s specimens occur on slabs of limestone at Yen-tsy-yai, in 
Shan-tung. 
Also from Middle Cambrian: (86f) Fu-chéu series, about 1,000 feet (305 m.) 
above the white quartzite [see Blackwelder, 1907), p. 92, for general stratigraphic 
relations], collected in a low bluff on the shore of Tschang-hsing-tau Island, east of 
Niang-niang-kung, Liau-tung, Manchuria, China. 
Collected by J. P. Iddings and Li San. 
Genus PROAMPYX Frech. 
Proampyx FRECH, 1902, Lethea geognostica, pt. 1, Lethea paleozoica, No. 2, p.66. (Genus defined 
and discussed essentially as below.) 
Dr. Fritz Frech proposed the genus Proampyx for Anomocare acuminatum 
Angelin [1854, edition of 1878, p. 26, plate 18, fig. 7] on account of the projection of 
the frontal border into a strong spine. He said [1902, p. 66]: 
“The peculiar, very variously formed group of Anomocare acuminatum with 
pointed glabella, seems to be the forerunner of Ampyx and is called Proampyx. 
The difference from the typical Anomocare with rounded cephalic shield is striking. 
The separation of the genus Proampyx from the typical Conocephalide follows from 
the transitional forms Arionellus sulcatus [Angelin, pl. 18, fig. 6] and A. difformis 
