42 ART. 2. — IT. YABE : CRETACEOUS 



trace of a forward pi-oloiigalioii. Tlio eross-^oction of tlio whorl 

 is oblong, being broadest in the middle of the lateral side. The 

 umbilicus is of a moderate size, about 5 of the inner volution 

 being exposed ; the umbilical wall gently slopes toward the um- 

 bilical suture and to the lateral side. 



The suture line shows many lobes on each side, which are 

 finely and deeply incised aiid diminish in size toward the umbilicus. 

 The external lobe is as deep as the first lateral. The external 

 and the lateral saddles as well as the first lateral lobe are bipartite. 

 Judging from the general aspect of the shell, and especially from 

 the suture line, the present species seems to belong to a particular 

 subgroup of Gavdryceras, which contains only thiee species from 

 foreign Cretaceous, viz., (t. odicm^c Koss. of the lower T^tatur 

 group of Houth Indi;!. (1. vdruna Forbes of the VaUulayur bed 

 of the same region and G. anaxpatum Redtenbacher sp. of the 

 Gossan bed of north-east Alps. Our form is distinguished from 

 G. odiense hj its broader umbilicus and its lower whorls, from 

 G. varuna and G . anaf^patum by the different form of the whorls. 

 G. varuna is a species also found in the Quiriquina bed of Chili."*^ 



Localities : — Chashikots in Ikandai near Urakawa, Prov. 

 Hidaka, and the Bannosawa near the Poronai coal-mines, Prov. 

 Ishikari. 



Horizon : — Pachyd isru.^-hoih. 



1) Kossmat: 1. c. p. P.-'î (129), PI. IV. (XVIir.i, fi-. 1:., b,c; V\. Ilf. (XVTL), fig. 8. 



2) Kossm.vt: 1. c. p. U (130); p. Go (101), PL II. (XVD, fio-. 4 a, h ; PL III (XVII), 

 fis- S. 



3) Redtenbacher: I.e. p. ll:î, PL XXVI., f;"'. 1. 



4) Stkixmaxn: \.c. p. 'IS, PI. V., fi,us. 2 a, I.. 



