Dr. IT. A. Nicliolson on new Sj^ccies of C/rapfoU(i\<}. 233 



line from the radicle, into two secondary branches, of wliich 

 one is directed upwards and one downwards. Of these the 

 superior branch appears to give off no tertiary offsets, being 

 directly prolonged into the celluliferous stipe. The inferior 

 bi'anch, on the other hand, gives off two tertiary offsets on the 

 same side, the extremities of the three divisions thus produced 

 becoming celluliferous upon one side. The stij)es are ex- 

 tremely slender ; the cellules are about twenty in the space of 

 an inch ; the cell-mouths are at right angles to the back of 

 the stipe, and the denticles arc sim])ly angular, and not 

 mucronate. 



This pretty little species is distinguished from all the other 

 members of the genus by its very minute size, by its mode of 

 branching, and by the extreme tenuity of the divisions of the 

 funicle and of the celluliferous stipes. 



Lac. Upper beds of the 8kiddaw Slates, Thornship Beck, 

 near Shap. 



Dicliograpsus (?) annulatus, Nich. PL XI. figs. 4 «& o. 



S/)ec. char. Frond compound, branching and rebranching. 

 Base unknown. Branches coming off from one another more 

 or less nearly at right angles, often attaining a length of from 

 four to five inches, and })reserving a uniform width of about a 

 line. Cellules from seventy to ninety in the space of an inch. 

 The face of every one of the stipes is crossed by a number of 

 transverse, sometimes slightly wavy, ridges, amounting to the 

 above number in the inch ; but the state of preservation of the 

 specimens is such that it is impossible to determine whether 

 these are the cell-partitions or are the mouths of the cellules 

 shown in a sealariform view. In the former case the direction 

 of the cellules Avould be nearly transverse to that of the stipes. 

 The margins of the stipes, however, are quite plain and ex- 

 hibit no denticles ; so that the latter view would appear to be 

 the correct one. 



This singular forni is recognizable, even in small fi-agments, 

 by the presence of the above-named transverse ridges, Mhieh 

 give the stipes somewhat of the aspect of a ringed worm. 

 Whichever view be adopted of the nature of these ridges, they 

 unquestionably mark the position of the cellules, which are 

 thus seen to reach the extraordiiuiry number of not far from 

 100 in the space of an inch. The central portion of the frond 

 is not shown in any of my specimens (the best of which was 

 discovered by ^Ir. Christuphersun, of Keswick) ; and it is 

 therefore impossible to fix finally the generic position of the 

 species. Its mode of branching, however, corresponds closely 

 with that oi Dicho(j/raj)stis] and as this genus has its home in 



