Affinities of the Genus Potlioeites. 35 



is " divided into four slightly elevated lappets," with an 

 unevenly roughened surface. 



This agrees in every respect with those shown on the 

 upper portion of the Pothocites from Eskdale (Plate IV. fig. 

 16). Their size also is almost similar. 



Wliether each of the lubes of the little quadrate bodies 

 represents a sporangium, or the sporangium is four-lobed, 

 I have not sufficient evidence to decide. It is quite 

 possible that the sporangia were arranged in groups of 

 four. It is, liowever, evident that the " stellate bodies" are 

 formed by an outward radial splitting of the four lappets, 

 the split edges of which eventually become deflexed. 



The shield-like structure (quadrate bodies) of Stur is 

 formed by the sporangia (or sporangium), and does not 

 appear to be a peltate expansion to which they were 

 attached, as he supposes. 



As already indicated, the sporangia are located on 

 elevated longitudinal rows, which I regard as the equiva- 

 lents of the furrows on the stem. But it must also be 

 noted that the sporangia of contiguous rows stand opposite 

 to each otlier. 



From this comparison of the structure of the fruit, 

 foliage, and stem of Pothocites, with undoubted fruiting 

 specimens o{ Bornia yadiata, their agreement is so complete 

 that it appears to me this genus can only be regarded as 

 the fruit of Bornia {Archceocalainites) radiata, Brongn., or 

 of a closely allied species of the same genus. 



In the short description which I originally gave of the 

 specimen collected by Mr T. Stock at Glencartholm, it 

 was provisionally named Pothocites calamitoicles. I have 

 since compared it carefully with the original type, and 

 now find that the points I regarded as of specific value 

 cannot be retained as such. 



The chief character which induced me to bestow a 

 specific name upon this specimen was the much greater 

 breadth of the segments in proportion to their length 

 when compared with Pothocites G^-antoyiii. 



But this diversity is fully explained when we take into 

 consideration the different states of development in which 

 the two specimens occur. 



In P. G-rantonii the fruit appears to have passed 



