390 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [June 16, 



Graptolites Flemingii, n. sp. PL XXI. figs. 5, 6, 7. 



Spec. Chak. Linearis, plures iincias longus, lineam latus, dentibus confertis ; 

 cellulis obliquis b^e^■ibus, canalem communem jequaiitibus, ore lato, insuper in 

 spinam acuminatam satis longam decurvatam producto, subtus inermi. 



Description. — Long, linear, about a line broad, tbe young part 

 narrower. Edge closely dentate, the cells being about four in tbe 

 space of a line, oblique, and not occupying in tbeir depth above half 

 or a httle more of the entire breadth of the shaft ; they are straight, 

 not curved at their base, and are famished at their upper edge with 

 a strong acummate spine, which is cui*ved downwards almost from its 

 origin and overhangs the wide concave margin of the mouth. The 

 latter at its lower edge abuts directly against the succeeding cell, and 

 is not at all produced. The curved spine is, in full-grown specimens, 

 equal in length to three-quaiters the breadth of the shaft ; in younger 

 and narrower specimens it is equal to it. Axis distinct, narrow. 



The spines vary a httle in degree of downward curvature, but they 

 are never direct, nor are they so short as in G. Cliimcera, Barr., a 

 species with which om's is closely connected ; moreover in that species 

 the length of the cells is greater in proportion to the width of the 

 shaft, and the lower edge of the mouth is shortly produced, ^t do 

 not feel justified therefore at present in uniting them, but it is quite 

 possible that other specimens may show that the Bohemian species 

 varies in these characters. M. Ban*ande, on a cursory view of the 

 fossil now described, considered it to be his G. coJonus ; but in that 

 species, besides the spine being shorter, it is placed on the lower 

 edge of the mouth, and the long cells have a curve at their base, as in 

 G. priodon. It should be compared with the species figured as 

 G. Sedgicickii by Geinitz {Joe. cit. pi. 3. fig. 2). 



Our numerous specimens present constant characters. We have 

 figured with the usual full-grown foinn (fig. b a, b h) 2i specimen or 

 two squeezed laterally (figs. 6, 7), in which the cells consequently 

 appear obhque and elongated. These specimens have the cells longer, 

 taking their origin nearer to the back of the shaft, which also shows 

 a shallow depression down it, where the axis was placed. The spines 

 are very much decurved. These obhquely crushed specimens show 

 at the base of each cell the impression of the opening, or rather of 

 the edges of the opening, into the common canal : this structure was 

 first explained by M. Barrande, and is that which gives the scalari- 

 fonn appearance to the single graptolites. It is more completely 

 shown in our figure of G. laxus (PI. XXI. fig. 9), and is also figured 

 by Geinitz without explanation (/. e. X. 2. f. 35, 36). 



Loc. Balmae, Kirkcudbright, in great plenty. (Wenlock shale ?) 



Graptolites Sagittarius, Linn. PI. XXI. f. 8. 



Prionotus 5<7^«Y^arn/^,Hisinger,Leth8ea Suecica, Supp.p. 1 14.t.35.f.6. 

 G. ineisus, Harkness, Quart. Joum. Geol. Soc. vol. vii. pi. 1. f. 8. 

 G. Sagittarius, Geinitz, L c. t. 2. f. 2-7. 

 G. Barrandei, Scharenberg, I. e.t. 1. f. b-7. 

 G. virgulatus, Scharenberg, /. c. t. 1. f. 8-11. 



