RAVENHEAD COLLECTION IN THE BROWN FREE LIBRARY AND MUSEUM. 399 



two incomplete periods. The lengths of the internodes entering into the composition 

 of the specimen are as follow : — 



Period incomplete. 



Period complete. 



Period complete. < 



Period incomplete. ■{ 





mm. 



Internode 1 



8-50 



2 



5 



3 



6-50 



4 



5-50 



5 



4-50 



6 



5 



„ 7 



3 



8 



4 



9 



3-50 



„ 10 



3 



„ 11 



3 



„ 12 



7 



„ 13 



6 



„ 14 



8-50 



„ 15 



8 



„ 16 



8 



„ 17 



7-50 



„ 18 



7-50 



„ 19 



7 



„ 20 



5 



„ 21 



4-50 



„ 22 



4 



„ 23 



3-50 



„ 24 



7-50 



„ 25 



8 



„ 26 



11 



„ 27 



12 



„ 28 



12-50 



„ 29 



12 



„ 30 



11-50 



„ 31 



11 



„ 32 



10-50 



„ 33 



8-50 



„ 34 



9-50 



„ 35 



6-50 



„ 36 



5 



„ 37 



9-50 



„ 38 



19 



„ 39 



22-50 



„ 40 



17 



Node with branch-scars. 



Node with branch-scars. 



Node with branch-scars. 



321-50 mm. 



I am not certain that the full width of the specimen is shown at any part. On the 

 right-hand side the true margin of the fossil is seen, on the left, from the manner in 

 which the matrix has splintered off, it is difficult to decide as to whether the full 



VOL. XXXV. PART II. (NO. 10). 



3 x 



