51 



1 3 diameter or a little more apart. Siphuncle narrow, central, and surrounded 

 by very short septal neck. 



Dimensions : — Length 136 mm., diameter of the larger end 16 mm. and 

 that of the smaller end 8 mm. 



Two specimens have been examined, of which the larger one has the 

 dimensions given above ; both are partly rubbed, and the real outline of the 

 shell in cross section is not exactly known, though in most probability it is 

 oblong. 



Distinguished easily from O. chi)icnsc by somewhat more crowded septa 

 and very short septal neck. 



Locality : — Between Yang-ko-la, Chi-chian-hsien, prov. Sze-chuan and 

 Chu-tien-ya, prov. Kwei-chou (Y.amaha Coll.) ; found together with O. 

 cJiinensc Foord. 



Orthoceras sp. indet. 



PI. XIX., Figs. loa-b. 



A cast of two contiguous septated chambers ; almost circular or slightly 

 (jblong in cross section (owing to deformation ?) ; the lower chamber, 25 x 23 

 mm. in cross section, is about 8 mm. deep. The siphuncle is central and only 

 3 mm. broad. 



Too imperfect for specific identification ; but apparently distinguished 

 from O. cliincnsc by the possession of more numerous septa. It is possible 

 that this is specifically identical with the preceding form. 



Locality : — No-lu-ping, Tung-hu-hsien, prov. Hu-pei (Usui Coll). 



Gen. et. sp. indet. 



PI. XXVII., Fig. I. 



This is a fragment of a straight cone Nautilid, with very crowded septa 

 Ticar the body chamber ; no further features being exhibited on the specimen, 

 its generic and specific determination is quite out of the bounds of possibility. 



