DESCRIPTION OF GENERA AND SPECIES. II! 
Length of the cephalon, exclusive of the occipital ring, of the type and only 
specimen, 6 mm., with a width near the edge of the palpebral lobes of 10 mm. 
This species is distinguished from T. typicalis by its broader glabella and fixed 
cheeks, and upward sloping frontal rim, and from 7. lansi Monke by the absence 
of a frontal limb and the character of the lobes of the glabella. The pygidia which 
are referred to T. lansi may possibly belong to 7. alcon; but from the fact that they 
are evidently from a different bed of limestone, and that there are no specimens of 
the cephalon associated with the pygidia, I do not think it best to include them 
under this species, especially as the cephalon of 7. Jansi and the pygidia appear to 
be from the same bed of limestone. 
Formation and Locality—Middle Cambrian: (C12) Gray limestone near the 
top of the middle limestone member of the Kiu-lung group [Blackwelder, 1907a, 
pp. 37 and 41 (part of the first list), and fig. 10 (bed 7), p. 38], 3.25 miles (5.2 km.) 
southwest of Yen-chuang, Sin-t’ai district, Shan-tung, China. 
Collected by Eliot Blackwelder and Li San. 
Teinistion lansi Monke. 
Plate 9, Figures 1, 1a—b. 
Teinistion lansi MONKE, 1903, Jahrb. k6nigl. Preuss. Geol. Landesanstalt und Bergakademie, vol. 
XXIII, pt. 1, p. 117, plate 4, figs. 1-17; plate 9, fig. 3. (Species described and discussed as the 
genotype of the genus Teinistion.) 
Doctor Monke states that this is the most abundant fossil on the slabs from 
Yen-tsy-yai. He gives a most elaborate description of the cranidium and free 
cheeks and portions of thoracic segments and pygidia which he refers to the species. 
We have reproduced a typical cranidium [fig. 1] and free cheek, [fig. 1b] for com- 
parison with Teinistion typicalis [see plate 9, figs. 2, 2a—0]. 
The pygidia referred to this species by Doctor Monke are strongly character- 
ized, but at the same time they are much like the pygidium named Dicellocephalus? 
sinensis by M. Bergeron [see plate 8, figs. 4 and 4a, of Stephanocare ? sinensis 
(Bergeron)]. The student is referred to the fine illustrations and description of 
Doctor Monke for further information. 
Formation and Locality—Middle Cambrian: Yen-tsy-yai, Shan-tung, China. 
Also (C6), thin, platy limestone in the upper shale member of the Kiu-lung group 
[Blackwelder, 1907a, pp. 37 and 41 (second list of fossils), and fig. 10 (bed 12), p. 38], 
2.5 miles (4 km.) southwest of Yen-chuang, and (C12) gray limestone near the top 
of the middle limestone member of the Kiu-lung group [idem (part of the first list), 
and fig. 10 (bed 7), p. 38], 3.25 miles (5.2 km.) southwest of Yen-chuang, Sin-t’ai 
district, Shan-tung, China. 
Collected by Eliot Blackwelder and Li San. 
Teinistion sodeni Monke. 
Teinistion sodent MONKE, 1903, Jahrb. kénigl. Preuss. Geol. Landesansalt und Bergakademie, vol. 
XxI, pt. 1, p. 123, vol. v, figs. 1-4. (Proposed species described and discussed.) 
This species is probably founded on compressed and broken cranidia of Black- 
welderia sinensis Bergeron. 
Teinistion typicalis (Walcott). 
Plate 9, Figures 2, 2a-c. 
Dorypygella typicalis WaLcoTT, 1905, Proc. U. S. Nat. Mus., vol. xxix, p. 29. (Species described and 
discussed.) 
Cephalon transversely semicircular, moderately convex. Glabella truncato- 
conical, with the sides converging gently to the rounded front; three pairs of gla- 
