126 Carruthers — On British Graptolites, 



Sp. 1. R. peregrinus, Barr. (Grapt. de Boh. p. 67, pi. 4, fig. 6), Loc. Moffat. 



2. R. LinnaU Barr. (loc. cit. p. 65, pi. 4, fig. 2-4). Common tube, very 

 slender, supporting largish hydrothecse, broad at the base and narrowing gradually 

 upwards. From 10 to 15 in an inch, uniform in the same specimen. Plate V. 

 Fig. 15. Loc. Moffat. 



3. R. maximus, sp. nov. (PI. V. Fig. 14). Common tube slender, supporting 

 very large hydrothecoe at wide intervals. Hydrothecae nearly half an inch long, 

 somewhat enlarged towards the apex, and furnished at the base with a triangular 

 corneous membrane extending a short distance up the margin of the cells. About 6 

 cells in an inch. Loc. Moffat. 



4. R. capillaris, sp. nov. (PI, V. Fig. 16). Common tube very slender, with 

 short isolated triangular hydrothecae, their base of attachment to the common 

 canal as long or longer than their depth. About 16 cells to an inch. Loc. Moffat. 

 Richter figures this specimen in Zeitschr. Deutsch. Geol. Gesellsch. V. 1853, Tab. 

 xii. fig. 34 a., referring it io R. gemmatus,^Qxx.^ which is very different, and of 

 which his fig. 34 b. is a good representation. 



R. triangulatus, Harkn. (Geol. Journ. vol. vii. p. 58), was founded on portions 

 of the proximal end of G. convohitus^ His., as has been stated by several observers. 

 It is remarkable, however, that this species of Graptolithus really terminates proxi- 

 mally in a polypary that cannot be distinguished from Rastrites. This was pointed 

 out to me by Prof. Wyville Thompson in a specimen figured on PL V. Fig. i, which 

 Prof McDonald found one day he joined me in the search for the fossils at Bell 

 Craig, near Moffat. The specimen is now in Jermyn Street Museum. I have in 

 my own collection a smaller specimen, which exhibits also both structures on the 

 same organism. How far this may affect the stability of the genus Rastrites I cannot 

 at present say. All the species are founded on comparatively small fragments, and 

 it is possible that they may all be the proximal terminations of different species of 

 Graptolithus > 



R. Barrajidi, Harkn. (Geol. Journ. xi,, 475)? was founded upon specimens of 

 Cladograpsus gracilis^ Carr., according to Prof. Harkness himself (Geol. Mag. IV. 

 p. 258). 



Besides the forms enumerated, I have obtained several fragments agreeing with 

 the figures of Richter's Graptolithtcs urceolus (Zeitschr. Deutsch. Geol. Gesell. V. 

 1853, p. 462, Tab. xii., fig. 29, 30), and with the specimens drawn on Tab. v. fig. 

 3 and 4 of Geinitz's "Graptolithen," which he refers to the lower portion of the 

 stem oi R. triangulatus, Harkn., but which are certainly the same as the forms 

 figured by Richter. These fragments differ from R. peregrinus^ Barr. , in having a 

 small portion of the free end of the hydrotheca bent at a right angle, the mouth 

 being turned round so as to open in the direction of the proximal end of the poly- 

 pary. This character is so marked that I would not hesitate to include it in Ras- 

 trites, as a true species of that genus as it is at present understood, were it not 

 that I have hitherto met with it only in very short fragments ; and these will be 

 found, I believe, when more perfect specimens are obtained, to be the proximal 

 terminations of a Graptolithus^ agreeing in this respect with what I have described 

 in G. coftvohitus, His. 



Gen. II. Graptolithus. Linn. (Syst. Nat., Ed. I.). Polypary 

 simple, with a single series of hydrothecas in contact tkroughout 

 more or less of their length. 



Sp. I. Mlssoni, Barr. (Grapt. de Boh. p. 51, pi. 2, figs. 16, 17). Loc. Moffat. 



2. G.ifttefjnediiis, sp. nov. (PI. V. Fig. 18). Polypary slender ; proximal end 

 composed of a slender canal with distant, isolated, and very small hydrothecae ; 

 adult hydrothecae, short, triangular, the upper margin of the cell forming an acute 

 angle with the common canal. About 26 cells to an inch. This species differs 

 from G. Nilssoni, G. temeis, and G. Hisingeri in the form of the cells, and from 

 the last also in the slender common canal. Perhaps Portlock's figure 6a. pi. 19 of his 

 Report belongs to this species. Loc. Moffat. 



3. G. teituisy Portl. (Report of Geol. of Londonderry, p. 319, pi. 19, fig. 7). 

 Loc. Moffat. 



4. G. Salteri, Gein. (Die Grapt. p. 36), G. tenuis, Salter (Quart. Journ. vol. vii . 

 p. 173, pi. 10, fig. i). Loc. Girvan. 



5. G. Hisingeri, Carr., G. Sagittarius, His. et auct., non Linn. I have, in a 



