NICHOLSON SKIDDAW GRAPTOLITES. 129 



which I was fortunate eiioagh to discover the only specimen hitherto 

 found, at Outerside near Keswick. It is recognized at once by the 

 numerous simple stipes springing from the central branched funicle, 

 but not themselves subdividing. The mode of division of the funi- 

 cle, and consequently the number of the stipes, is not constant ; but 

 the branches are usually symmetrical in the same individual, vary- 

 ing in number from 18 to 25, but not exceeding the former number 

 in the specimen before me. The subdivisions of the funicle are 

 usually embraced by a corneous disk ; but in many specimens this 

 is either not developed, or it has been lost previous to fossilization. 

 The cellules vary in number from 22 to 26 in the space of an inch ; 

 the denticles are acute and angular, with their upper margins (the 

 cell-apertures) nearly at right angles with the axis, and not at all 

 unlike the adult form of G. Sagittarius, Linn. The breadth of tlie 

 stipes is not great, the maximum in my specimen being about y\ of 

 an inch. 



Log. Outerside, near Keswick. 



2. DiCHOGRAPSus ocTOBRACHiATus, Hall, sp. PL Y. figs. 1, 2. 



Oraptolithus octobracMatus, Hall (Geol. Survey of Canada, 

 Eeport for lb57 : also Graptolites of the Quebec group, 

 p. 96, pis. 7 & 8). 



Dichograpsus Sedgwichii, Salter (Quart. Journ. Geol. Soc. 

 vol. xix. p. 138). 



Dichograjpsus aranea, Salt. 



This species is of very rare occurrence in the Slates ; and I am 

 unable to find any undoubted specimen of it in the collection of 

 either Prof. Harkness or myself. It was first noticed in Britain by 

 Mr. Salter*, who named it D. SedgwicJcii ; but Hall's name (with 

 the date of 1857) appears to have the priority, and I have there- 

 fore adopted it. The frond consists of eight simple stipes, arising 

 from a short funicle, which is furnished with a median radicle. 

 The funicle divides dichotomously, so as to give rise to eight short 

 radiating non-celluliferous branches, which are prolonged into 

 the same number of monoprionidian stipes. Unlike the preceding 

 species, the number of stipes appears to be constant, or nearly 

 so, and can therefore be used as a specific character. There is 

 almost invariably a central disk surrounding the divisions of the 

 funicle (PI. Y. fig. 1) ; but it may in some cases be absent, as in 

 the specimen figured by Mr. Salter. The cellules are about 20 in 

 the space of an inch ; the denticles are well marked ; and the sepa- 

 rated stipes probably constitute one of the forms upon which the 

 Graptolites latus of M'Coy was founded (PL Y. fig. 2). 



Log. Braithwaite, near Keswick ; Mire House, near Skiddaw(?). 



3. Dichograpsus multiplex, Nicholson. PL YI. figs. 1-3. 



I have referred this unique and extraordinary Graptolite to the 



* In the Geologist, vol. i. 1861, I believe, but I am unable to refer to a copy 

 of this work. 



