566 MB. D. H. SCOTT ON THE ARTICULATED 



Mr. G. Sharman has kindly forwarded to me a sketch-section 

 of the rocks in the neighbourhood of Shap by Mr. Ooodchild, from 

 which it appears that the Shap specimens were collected from the 

 lower beds of the Mountain Limestone as developed in that area. 

 These rocks are probably of the same age as part of the Calci- 

 ferous- sand stone series of Scotland. 



Locality. — Shap Toll-bar, Westmoreland. 



DESCRIPTION OF PLATE XVIII. 



Lycopodites Vanuxcmi, Goppert, sp. 

 Fig. 1. Old stem, showing the form of the leaf-scars. Nat. size. 



2. Younger stems, showing their mode of ramification and the different 



form of the leaf-scars on branches of different ages. Nat. size. 

 3 a. Small fragment of branch, showing leaf-scars. Nat. size. 

 3 b. Same, enlarged. 



4. Small fragment of branchlet. Nat. size. 



5. Small fragment of branchlet. Enlarged to show form and arrangement 



of the leaf-scars and vascular cicatricule. 



6. Specimen showing the leaves and dichotomous division of the stem. 

 6 a. Leaf. Enlarged. 



Note.— Specimen Fig. 1 bears no locality, but is probably from the same 

 neighbourhood as the others, though its matrix is slightly more crystalline. 



On the Occurrence, of Articulated Laticiferous Vessels in Hevea. 



By D. H. Scott, M.A., Ph.D., E.L.S. (From the Jodrell 



Laboratory, Kew.) 



[Read 18th June, 1885.] 

 In a paper published in the « Quarterly Journal of Microscopical 

 Science ' for April 1884, I showed that the laticiferous tissue in 

 the genus Manihot consists of vessels owing their origin to cell- 

 fusion, and not. of inarticulated laticiferous cells, as in the 

 Euphorbiacese previously investigated. In a note appended to 

 this paper I gave reasons for believing that the same statement 

 holds good of the laticiferous tissue in Hevea Spruceana. Since 

 that time I have received abundant material of the seedlings ot 

 Hevea orasilicnsis from Peradeniya, through the kindness ot 

 Dr. Trimen. The specimens were preserved in arrack, and 

 arrived in perfect condition. This material represented the 

 history of the seedling during 25 days, from the 11th to the 

 36th after sowing, two seedlings having been taken up for each 

 day. The youngest show the very first stages of germination, 



