(ii) 64 Palxontologia Sinica Ser. B. 



The mold is covered by six transverse prominent annulations, which are separat- 

 ed by concave interspaces about 3.5 mm. wide. ,The annulations are slightly oblique 

 and moderately sharp. Near the uppermost end of the fragment the depressed space is 

 ornamented by numerous fine subimbricating striae, running parallel to the projecting 

 annulations. Besides these, there are a few indistinct longitudinal ridges across the 

 fine transverse strise. 



Rkmarks: This specimen is very poorly preserved and the data available are 

 not sufficient for specific identification, even though in external character it is somewhat 

 allied to Cycloceras peitoutzense Grabau' to a certain degree. 



Horizon ano Locality: From the Yellowish-green shale of the lower Neichiashan 

 formation at Tai-hung-shan, Nan-chang-hsien. 



Family TROCHOLITIDAE Hyatt 

 Genus DiSCOCERAS Barrande 

 Discoceras eurasiaticum Freeh. 

 Plate IX fig. 5, 6 a-b. 

 1911, Discoceras eurasiaticum Freeh: Riehthofen's China, Vol. V, p. 5, pi. I, figs. Ta-2b. 

 1920. Discoceras eurasiaticum, Yabe and Hayasaka; Palseontoiogy of Southern China, p. 54, pi. 

 XVIII, figs. 2a-b. 

 Shell (PI. IX., Fig. 6) discoidal, consisting of about four volutions, which expand 

 in height very slowly. The diameter of the shell measures 45 mm. from the apertaral 

 portion to the opposite periphery passing through the middle part of the umbilicus. The 

 dorsal side of the volutions is slightly impressed by the preceding one. The cross section 

 of the whorl is subquadrate in outline. Near the apertural end it is 15 mm. in breadth 

 and 10 mm. in height. The siphuncle is very small and marginal to the internal side. 

 The surface of the shell is covered by oblique transverse sharp costte, which bend back- 

 ward from the internal side toward the external. 



There is another well-preserved specimen (PI. IX., Fig. 5) which is somewhat larger. 

 A part of the test is broken, and the septa are distinctly exposed. The septal distance 

 is greater at the ventral side than at the dorsal. The cameras are very shallow and in- 

 crease in depth very shghtly. In the gerontic stage the septa are 3.5 mm. distant at the 

 center, while the whorl is about 14 mm. high. The costa) are very numerous, three 

 occurring in a space corresponding to the depth of one camera. 



Horizon AND Locality: The specimens were found in the upper part of the Nei- 

 chiashan formation at Nei-chia-shan near Sin-tan of Tze-kuei-hsieh, western Hupeh. 

 (J. S. Lee Coll.) 



I. Grabau: FalEeontologia Siniea, Ser. B, Vol. I, fase. i, p. 63, pi. VI, Figs. r-4. 



