A New Azygogrcfptus from Nortli Wales. 299 



.also to a damper climate than we have at present. The Pliocene 

 physical features of Transcaucasia were very different from those of 

 modern times, and the sea had not entirely left the plains which 

 are now dry land. Probably there were large expanses of sea near 

 the Godersky forests. 



In a word we have here a stage of evolution of a contemporary 

 type of the Pont and probably a Talysh flora, but a very early one 

 compared with that of the present mesophyll forests of the Caucasus. 

 The existmg forests have been formed, as we can now see, mostly 

 during upper and middle Pliocene periods, the floras of which in all 

 j)arts of Europe indicate a very sharp transition from Miocene floras 

 to those of modern times. The flora of the Godersky summit 

 witnessed considerable volcanic activity in the Caucasus and the 

 accumulation of masses of erupted material that formed the high 

 ground of the country. The curtain of the past has been lifted and 

 w^e are able to see one of the j)hases of the decline of the older tropical 

 flora, the advent of new forms which took part in the development 

 of the present-day vegetation. 



I am much obliged to Professor Seward for the revision of my 

 MS. and for seeing it through the press. 



T 



Sedgwick Museum Notes. 

 A New Azygograptus from North Wales. 



By Gertrude L, Elles, D.Sc, Newnham College, Cambridge. 



HE sraptolite here described was discovered first in the 

 St. 'Tudwal's peninsula by Mr. T. C. Nicholas in 1912 in the 

 Llanengan Mudstones, but it was not then regarded as distinct 

 from Azygog. lapworthi, though it seemed to possess certain features 

 not recognizable in the Lake District speciniens, the only area 

 from which that species had been previously recorded. The d iscovery 

 of numerous other specimens by Dr. Matley in the Lleyn peninsula 

 and by Dr. Greenly in the Bangor area has served to show that the 

 characters wherein this species differed from Azygog. la-pworthi are 

 permanent and of specific value, and since, moreover, it occurs at 

 a distinctly higher horizon than Azygog. lapworthi, benig 

 characteristic of about the middle of the zone of Didymog. extensus, 

 a description of it seems advisable. In general it has been noted 

 that it is in many respects intermediate in character between Azygog. 

 lapworthi on the one hand and Azygog. siiecicus on the other, and it 

 is perhaps significant that it occurs upon an horizon between the two. 

 Azygograjitus eivionicus.^ 



Stipe slightly deflexed, 2-4 cm. or more in length ; of a uniform 

 iDreadth of about O'S mm., originating from the centre of a slender 

 sicula but not curving away till the level of the aperture is almost 

 reached. 



^ Eivion is a well-known name for the Lleyn region. 



