NO. 1549. NEW ORDOVICIAN FOSSILS— WELLER. 561 



ASAPHUS TANINGENSIS, new species. 



Description. — Cranidiuni rather long and .slender, with the axis 

 nearly obsolete; the palpebral lobes apparentl}^ rather small, situated 

 back of the mid-length of the head. In front of the eyes the lateral 

 margins of the cranidiuni describe the two sides of an ov^ate curve, 

 gently diverging from the anterior extremities of the eyes, then 

 broadly rounding and converging abruptly in front to the obtusely 

 subangular anterior extremity; l)ack of the eyes the lateral margins 

 diverge al)ruptly with a gently convex curve to the posterior margin. 

 Anteriorly the surface of cranidiuni is somewhat flattened to form 

 an indistinct anterior limb. Occipital furrow and segment nearl}^ 

 obsolete. A faint median tubercle is situated on the median line of 

 the head about halfway between the line joining the posterior extremi- 

 ties of the eyes and the posterior margin, but aside from this the 

 surface of the cranidiuni is smooth. 



The dimensions of the type specimen are: Length of cranidiuni, 

 11 mm.; width at posterior margin, 11.5 mm.; width between the 

 eyes, 7 mm. 



Remark's. — This species is known only from the cranidiuni and it is 

 of course possible that it should be correlated with some one of the spe- 

 cies 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 ^1. hvvis, which is such a short form that it is not 

 at all likely to be a portion of the same species as this elongate crani- 

 diuni. The species should perhaps be referred to the genus Mega- 

 laxpls rather than As:aj>hns., but this can not be determined from such 

 incomplete material. 



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

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



ASAPHUS ASIATICUS, new species. 



Description. — Pygidium subsemiellipticai in outline, moderately 

 convex, the axis depressed, bordered by rather broadly rounded axial 

 furrows which become obsolete posteriorly; plural slopes promUfent 

 just outside the axial furrows, then sloping with a convex surface to 

 the margins, without a difl'erentiated marginal border. Axis occupy- 

 ing about one-third the total width of the pygidium anteriorly, taper- 

 ing posteriorly to a bluntly rounded point, divided l)y rather liroad 

 and shallow, obscure furrows into twelve segments. Pleural slopes 

 divided into about twelve obscure segments which reach less than half 

 way from the axial furrows to tlie margins, the most anterior furrow 

 crossing the plural slope is broad and deep, being much more conspic- 

 uous than those behind 



