(ii) SS Palxontologici Sinica Ser. B. 



The diameter of the ectoconch measures 13 mm. at the smaller extremity of the 

 fragment and 22 mm. at the larger. The distance between them is 108 mm. It 

 tapers at the rate of about i in 12. 



Comparison: This species appears to be related to V aginoceras belemnitiformis 

 Holm' in the extremely long tubi, but the former differs from the latter in having the 

 comparatively narrower endoconch and shorter ectoseptal distance. Moreover, the 

 ectosepta of our specimen become increasingly distant with the growth of the 

 ectoconch,which is not the case in Holm's form. It is also distinguished from any 

 of the foregoing species by its strikingly long tubi. 



Horizon and Locai.wy: In the bed above, but not far from, the thick-bedded 

 blue limestone near Wang-chia-sze, Chung-yang-hsien. The specific name is given in 

 honour of Mr. Shu, by whom this species was collected. 



Vaginoceras chientzekouense Yii (sp. nov.) 

 Plate v., Fig. 3. 



Ectoconch straight, cylindrical, rather slowly enlarging at the rate of 1:12. Trans- 

 verse section elliptical? Endoconch not very large, lying in contact with the outer 

 shell. 



This fragment reaches a length of more than 74 mm. Ectosepta moderately 

 concave, having a depth of more than one half of a camera. The ectoseptal interspaces 

 increase regularly and very slowly in length as they approach the basal extremity, 

 ranging from 12 to 16 mm., where the corresponding diameters of the ectoconch are 32 

 and 38 mm. respectively. 



The endocylinder only is shown. It is elliptical in section. From the longitudinal 

 section we may see that the interior of the endocylinder does not reveal anything but 

 the black lime matrix. The tubi are not well preserved, but from a tew that remain it 

 seems that the succeeding tubus is inserted into the next preceding one. The diameters 

 of the endocylinder have a ratio of 8:5. Its longer diameter is nearly 1/4 that of the 

 ectoconch. None of the organic stereoplasm exists in the camerse except the deposit 

 of secondary origin. 



I. G. Holm: Palseontologisclie Abhandlungen, Bd. Ill, Heft i, p. 5, Taf. 1, figs. 1-5. 



