4 ART. y. — H. Y ABE : 



On the other hand, Mr. Inouye included the complex of 

 Kai-youl in his Korean formation together with the Cambrian 

 limestoue with Trilobites, found in Phyong-yang-do. 



The majority of my examples were collected on the right 

 side of the stream at Kai-youl and especially at the first cliff 

 after crossing it from the north ; but the fossils are by no means 

 confined to that locality and I often found some traces of them 

 by hammering the slate and sandy slate exposed everywhere in 

 that neighbourhood. As a whole, however, the fossils are rare 

 so far as my experience goes, and their preservation is always 

 imperfect so that they can hardly be recognized in the field. 



Interesting plant remains are shown in three figures in the 

 accompanying plate. Fig. 2 represents a frond, the smallest but 

 most perfect of the examples now at my disposal. It lacks a little 

 of the apical portion and also the greater part of the basal, and is 

 4 cm. long and 3.5 cm. broad. The margin is coarsely dentate, 

 with pointed teeth turned somewhat upward. The median vein as 

 also the secondary ones, are straight and definitely impressed 

 though weak ; the latter are simple, parallel and alternate, making 

 with the former angles of about 40°-60°, and passing to the end 

 of each tooth, there being seven of them on one side of the median 

 vein and six on the other. The tertiary and quaternary veins 

 are quite obscure in this specimen, as in many others. These, 

 however, are more or less distinct in some of them and especially 

 in the one represented in fig. 4, which though very fragmentary, 

 is valuable in this respect. From this figure, it will be seen that 

 the tertiary veins are very crowded ; they are simple, parallel and 

 subopposite, making with tlie secondary vein an angle of about 

 50°-90°. The quaternary veins are much more delicate and their 

 course is difficult to trace in detail. Fig. 3 represents still 



