286 RESEARCH IN CHINA. 
Asaphus blackwelderi Weller (plate 26, figs. 21, 22). 
1907. Asaphus blackwelderi Weller, Proc. U. S. Nat. Mus., vol. xxxu, p. 560. 
Cranidium comparatively short and broad with the axis obsolete, obtusely 
angular in front, the palpebral lobes large and prominent, their anterior margins 
nearly opposite the middle point of the head; in front of the eyes the lateral margins 
diverge gradually to a point nearly half-way to the anterior margin, where they are 
rather broadly rounded and then converge somewhat abruptly to the anterior 
extremity; back of the eyes the lateral margins diverge rapidly and curve backward 
to the posterior margin, the width of the cranidium along its posterior margin being 
considerably greater than the distance between the eyes. The occipital furrow and 
segment are faintly developed. A slight median tubercle is situated at a point about 
half-way between the line joining the posterior extremities of the eyes and the pos- 
terior margin, aside from which the surface of the cranidium is apparently smooth. 
A free cheek is associated with this cranidium and possibly belongs to the same 
species; its lateral region is differentiated as a rounded marginal border, and its genal 
angle is produced into a rather strong genal spine. 
The dimensions of the cranidium described are: length 8 mm., width between 
the eyes 6 mm., width along posterior margin 7.5 mm. 
The outline of the cranidium upon which this species is established somewhat 
closely resembles that of A. expansus Dalman, the typical species of the genus, and 
both species are marked by a similar small median tubercle near the posterior mar- 
gin. This Chinese species may be distinguished from its European ally, however, 
on account of the obsolete glabella. If the free cheek which occurs with A. black- 
welderi really belongs to the species, this also will serve to distinguish the two forms 
by reason of its strongly developed genal spine, these spines being absent from the 
European species. This cranidium should possibly be associated with one of the 
pygidia described in the present paper, possibly with the one which has been com- 
pared with A. expansus, although the cranidium does not occur in the same locality 
with these pygidia in the collections studied. 
Asaphus taningensis Weller (plate 26, figs. 19, 20). 
1907. Asaphus taningensis Weller, Proc. U. S. Nat. Mus., vol. XxxuI, p. 561. 
Cranidium rather long and slender, with the axis nearly obsolete; the palpebral 
lobes apparently rather small, situated back of the mid-length of the head. In front 
of the eyes the lateral margins of the cranidium describe the two sides of an ovate 
curve, gently diverging from the anterior extremities of the eyes, then broadly 
rounding and converging abruptly in front to the obtusely subangular anterior 
extremity; back of the eyes the lateral margins diverge abruptly with a gently con- 
vex curve to the posterior margin. Anteriorly the surface of cranidium is somewhat 
flattened to form an indistinct anterior limb. Occipital furrow and segment nearly 
obsolete. <A faint median tubercle is situated on the median line of the head about 
half-way between the line joining the posterior extremities of the eyes and the pos- 
terior margin, but aside from this the surface of the cranidium is smooth. 
The dimensions of the type specimen are: length of cranidium 11 mm., width at 
posterior margin 11.5 mm., width between the eyes 7 mm. 
This species is known only from the cranidium and it is of course possible that 
it should be correlated with some of the species here described from the pygidium 
alone. ‘The only one of these pygidia, however, which is recognized from exactly 
the same locality as this species is A. levis, which is such a short form that it is not 
at all likely to be a portion of the same species as this elongate cranidium. The 
species should perhaps be referred to the genus Megalaspis rather than Asaphus, 
but this can not be determined from such incomplete material. 
