HEEK KILTOKKAN FOSSILS. 171 



l^roximated warts, "which are somewhat more pressed together. This 

 difference appears to me of no importance, as Knorria imhricata 

 (of which Knorria acicularis is perhaps only a variety) also occurs 

 with more or less approximated warts. Schimper, who set much 

 value upon this difference, has separated the species as Knorria 

 Bailyana. Opinion is known to be much divided as to the relation 

 of Knorria to Lejpidodendron. Goppert, in his first work on the 

 plants of the transition rocks, made twelve species of Knorria, but 

 afterwards reduced them to one, placing most of them with Lejpido- 

 dendron Veltheimianum ; whilst Geinitz and Schimper hold Knorria 

 imhricata to be a distinct plant. The numerous specimens from 

 Bear Island have inclined me to this view, which I have dwelt upon 

 more fully in my ' Flora of Bear Island.' It is true that Schimper 

 connects with Knorria Bailyana (with a query) the fruits which I 

 refer to Cydostigma, and also (again with a query) the Cyclostigma 

 minutum, Haught., of which he has only received very fragmentary 

 pieces. It may, indeed, be a question whether our Knorria is not a 

 peeled Cyclostigma. This does not appear to me very probable — 

 because, in the specimens figured by me in figs. 2 and 3, single por- 

 tions are peeled ; under this bark, however, we by no means have 

 Knorria. We see, indeed, in fig. 3, the impression of the inner bark, 

 but no Knorria-st'i'ucture, and just as little in fig. 2. That it is not 

 only the bark which we have here, but pieces of the whole stems and 

 branches, we see from the thick masses of coal, and because in some 

 places the impression of the warts at the back is to be seen. 



4. Lepidodendkon" Yeltheimiaktjm, Sternberg. 



The specimen represented in fig. 1 is from Tallowbridge ; but I 

 received a similar one from Kiltorkan. It is only the impression of 

 a short fragment of a branch ; and as in this the leaf-scars are not 

 so beautifully and sharply defined as in the stems, the exact deter- 

 mination is very difficult. We recognize upon the branch very closely 

 approximated leaf-scars, which touch each other at the margins. 

 They are rhomboidal, longer than they are broad. Inside them we 

 have an oblong or obovate depression, pointed at the base (mag- 

 nified in fig. 1 6) . The cicatricula is not preserved. In their form 

 and thick-set position these leaf-scars resemble those of the branches 

 of L. Veltheimianum ; but a more certain determination cannot be 

 made from the present specimens. 



I received this specimen as Lejndodendron elegans, Haught. A 

 L. Oriffitliii, Brongn., is not known to me. As far as I know, 

 Brongniart has nowhere described a species under this name. The 

 formation of the bark is so very diiferent from that of Cyclostigma, 

 that it cannot be a branch of the same tree. On the contrary it may 

 be a question whether the Cyclosiigmata may not be roots or, more 

 properly speaking, rhizomes of Lepidodendron. It may be alleged 

 that they remind us forcibly of the Stigmarice, which are now pretty 

 generally considered to be rhizomes or root-formations, and connected 

 either with Sigillaria, Lepidodendron, or Knorria. So long, how- 

 everj as no traces are fouiid of such a connexion between Cyclostigma 



