Carruthers — On British Graptolites, 131 



A satisfactory description and drawing of it would be of value. Loc. Gogofau, 

 Carmaerthenshire. 



5. D. Whitfieldi, Hall (Pal. N, York, iii. p. 516, fig. i,). D. quadri-mucro- 

 natus, Nich, (Geol. Mag. IV. PI. VII. Fig. 6). This species I had long considered 

 to be a mucronate form of D. pristis, with which species it for the most part agrees, 

 except in the possession of the spines proceeding from the cell mouths. In the 

 drawings, PI. V. Fig. 7,b and 3^, the spines are represented by somewhat too 

 strong lines ; their direction, which seems in life to have been at right angles to the 

 direction of the polypary, depends in the fossil upon the way in which they have 

 been pressed before or during fossilization. The direction is different on the two 

 sides of Fig. 3 r. 



6. D.mucronatus, Hall (Pal. N. York i. p. 268, pi. 73, fig. i.), PI. V. Fig. 2. 

 Loc. Moffat. 



It is not easy to determine how far the processes from the mouths of the 

 hydrothecas are to be depended upon for specific characters. Mr. Baily, from 

 Irish specimens, has figured under the name of D. mucronaius (Grapt. of Meath, 

 etc., fig. 4 a, by f), a remarkable form, with the general aspect of D. pristis and D 

 Whitfieldi, but with several branching and apparently anastomosing processes from, 

 the cell mouth. I have met with the same form at Moffat, and figured them in the 

 Intellectual Observer, May, 1867, pi. i, fig. 6 ; and Hall, also, in his Graptolites of 

 the Quebec group, pi. B. fig. 10, gives a drawing of a somewhat similar structure. 

 He considers the processes to be the marginal fibres of the reproductive sacs, the 

 sacs themselves having been removed (by maceration). The discovery of additional 

 specimens may show that it is really a new species ; and should it turn out to be 

 so, I would suggest that it be called D. Bailyi^ after the palaeontologist who is 

 doing so much towards the illustration of the paleozoic fauna of Ireland. The 

 polypary has been very flexible, as bent and twisted specimens have occurred both 

 to Mr. Baily and myself. 



7. D. tricornis, Carr. (Trans. R. Phys. Soc. Edin. 1858, p. 468, fig. 2). G. 

 majcidiis, Hall (Pal. N. York iii. p. 515, figs. 1-3). When I described this species 

 I had not detected the mouths of the cells in those specimens in which they should 

 have been shown on the upper surface. In more perfectly preserved specimens 

 since obtained these have been beautifully shov/n (PL V. Fig. iia). I have given 

 a drawing (Fig. 11^) of the early state of this graptoHte. I drew attention to this 

 early form and figured it in the Physical Society's Transactions for 1858, and in the 

 Annals and Magazine of Natural History for January, 1859. In the third volume 

 of the Palaeontology of New York, published in 1 859, with the dedication dated 

 September, 1859, Prof. Hall figured the early state of the same species, p. 508. 



8. D. cojneta, Gein. (Grapt. p. 26, pi. i, fig. 28), D. tubidariformis, Nich, 

 (Geol. Mag. Vol. IV., p. 109, PI. VII. Figs. 12-15). This is a remarkable species, 

 which should, perhaps, be made the type of a new genus. Geinitz's figure is very im- 

 perfect and fragmentary ; an excellent figure is given by Richter in the German 

 Geol. Society's Zeitschrift (1853, pi. xii. figs. 16, 17). I have given (PI. V. Figs. 

 4<a:, (5, and c) drawings of three different forms. These faithful drawings by Mr. 

 Hollick may be compared with Dr. Nicholson's figures quoted, and some idea may 

 be formed of the value of his illustrations ; but his own drawings supply materials 

 for their condemnation, for in his enlarged drawing of Fig. 14 he has made the 

 8 cells of the "nat. size" into 10, and in fig. 15 the 4 cells in the "nat. 

 size" become 6 in the enlargement, so increasing not only their size but their 

 number also. 



Gen. IX. Climacograptus, Hall (Grapt. Quebec Gr. p. 111). 

 Polypary with a double series of cells hollowed out of the common 

 epiderm. 



Sp. I. C. scalaris. Hall (Grapt. Quebec Gr. p. ill), Graptolithus scalaris, Linn. 

 (Skanska Resa, p. 147), Prionotus scalaris,YL\s. (Leth. Suec. p. 113). G. palmeus, 

 Barr. in part (Grapt. Boh. pi. 3, figs. 5 and 6). G. mcntitcs, Barr. in part {ibid. 

 pi. 2, figs, 7 and 8). G. Halli, Barr. in part {ibid, pi, 2, figs. 14 and 15). G. 

 personattis, Scharen, (Grapt, p. 15, pi. i, fig. 12). G. teretiiiscuhcs. Salt. (Quart. 

 Journ. viii. pi. 20, figs. 3 and4). Diplograpsics rectangiilaris, M'Coy (Pal. Foss. p. 8, 

 pi, IB, fig. 8). D. pristis, var, scalar iformis, Baily (Grapt. fig, 2 a, b, c). 



From the time of Hisinger until Hall restored the name, this species was greatly 



