48 



M. YOKOYAMA. 



d.) P. lanceolatus var. minor Heer. 

 PI. V, fig. 8. 



A single specimen with three leaflets attached to a rhachis was 

 obtained at Shimamwa. These leaflets are narrowly lanceolate with 

 acute apex and with about 18 veins. Heer says of his variety minor, 

 that the leaflets are narrow, linear-lanceolate with sharply pointed 

 apex and with 14-10 veins (Beitr. 1876, p. 110). To this our speci- 

 men must be referred, so like is it to the figures of Heer (Beitr. 

 1876, pi. XXVII, fig. 7, 8), although in number of veins it slightly 

 exceeds the Siberian. 



A leaflet on the right hand side of our drawing is very un- 

 favourably situated. It looks narrower than if actually is. It 

 measures about 6*5 mm. in breadth, and is not at all narrower than 

 others which also possess a nearly equal breadth. 



e.) P. lanceolatus var. latifolia Heer. 

 PI. IV, fig. lc. PI. V, fig. 1. Fl. VI, fig. 1. 



This variety is distinguished by having larger, longly-oval, 

 obtuse leaflets with 20-30 veins. 



The specimens, though all incomplete, I. cannot but identify with 

 this variety. Fig. lc, V\. IV, which is wanting both at apex and base, 

 measures 20 mm. in breadth, and is pierced with about 30 veins. Fig. 

 1, PI. V, shows two leaflets, one with the apex and the other with the 

 base. These leaflets agree in form with those figured by Heer from 

 Spitzbergen (Beitr. 3. Foss. Flora Sjiitzh.. pi. VIII, fig. 3). Veins are 

 very numerous — about 30 in number-and the breadth in the broadest 

 part of the blade is 19 mm. Fig. 1, PI. VI has 28 veins and is 

 17 mm. broad. 



Specimens were obtained at Shimarnura where they seem to have 

 been rather rare, 



