CEPHALOPODA FPO>r THF. TTOKKATPO. Ô6 



tlu'ir interspace!^ on tlie former are nnitbi'inely covered witli very 

 fine striiTC which do not heconie gradually coarser and less in 

 iHnnl)er in the older volutions, as we have seen in G. tenuiliratitm. 



On account of tlie aliove characters I have provisionally 

 referred G. striatum to the sul)giou]) of G. rrassicostatum, altliough 

 its aflfinity to this subgroup is not yory close, as is also the case 

 witli G. (Jeni^eplirafimi. 



Locality: — Tlie Al)eshiii;n-rn]»('shi])e, a trihutary of tlie Teshio- 

 gawa, Prov. Tesliio. AVe possess only two s]^eciniens — one of which 

 is the original of Juinö's illustration and the other is represented 

 in figure 5 in PI. IV. 



Horizon : — Pachydiscus-hed^. 



Var. PICTA m. 

 PI. IV., fig. a, b, c. 



The third specimen of G. striatiuii is a somewhat modified 

 form ; the following table exhibits the dimensions measured on 

 the external as well as on the internal volutions of the same 

 specimen. 



Dimensions : — 



Diameter. 



Height <if the la^t whorL 

 P.reaiUh of tlie hist whorL 

 Widtli of nnibilicns. 



From the al)Ove table it is evident that the form of this 

 variety varies greatly in various stages of its growth. It is 

 distinguished from the normal type by its broader whorls whose 

 cross-section is quadrate. 



The specimen is in a good state of preservation. Tlie slid] 



