562 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxxii. 



The dimensions of the type specimen, an incomplete pygidium, are: 

 Length, 20.5 mm.; width, about 30 mm.; width of axis anteriorly, 

 10 mm.; length of axis, 16 mm. 



Remarhs. — This species is known only from the pygidium which is 

 much like that of the European A. expansus., being distinguished 

 chiefly by its greater proportional length and by the more obscure 

 segmentation. 



Formation and locality. — Ki-sin-ling limestone, locality 20 C, near 

 Su-kia-pa, province of SsT-ch'uan. 



ASAPHUS L-^VIS, new species. 



JJescrljjtlon. — PA^gidium nearl}^ semicircular in outline. The axis 

 depressed, without segmentation, poorl}^ defined by the nearly obso- 

 lete axial furrows, occup3dng about one-fourth of the total width of 

 the pygidium anteriorly; pleural slopes smooth, without segmenta- 

 tion, convex toward the axis but becoming depressed in a broad, mod- 

 erately concave marginal border toward the outer margin. The pos- 

 terior extremity of the axis reaching the inner margin of the concave 

 border. 



The dimensions of the type specimen arc: Length, 12 mm.; width, 

 23 mm.; width of axis anteriorh^ 5.5 mm.; length of axis, 8.5 mm.; 

 width of concave marginal border, about 3.5 mm. 



Remarl'i^. — This species is represented in the collection by a single 

 nearly complete pygidium. So far as can be determined, it seems to 

 be a member of the genus Asa])]nis in its strict sense, the species 

 being especially characterized hy its remarkably smooth surface. 



Formation and JoeaJlty. — Ki-sin-ling limestone, localit}^ 20 B, near 

 Su-kia-pa, province of Ssi-ch'uan. 



ASAPHUS CHINENSIS, new species. 



Description. — This species is founded upon a single nearly perfect 

 p\^gidium and is nuich like the last-described form. It dift'ers in its 

 proportions, however, its dimensions being: Length, 14 mm.; width, 

 22.5 mm.; width of axis anteriorly, 6.8 mm.; length of axis, 0.5 mm.; 

 wSRh of concave marginal border, about -i nun. The most marked 

 differences between the two species is the much more conspicuous 

 concave border in ^1. chlnen-sls and in the slight though obscure traces 

 of segmentation upon both the axis and the pleural slopes. This 

 latter character, however, may be due to the removal of the test from 

 the central portion of the specimen, and if the external surface were 

 preserved it might be as smooth as ^1. leevls. 



Form at 1 0)1 and locality. — Ki-sin-ling limestone, locality 20 C, near 

 Su-kia-pa, province of Ssi-ch'uan. 



