138 FKOCEEDINGS OF THE GEOLOGICAL SOCIETY. [Dec. 17, 



genus have no connecting bars ; but in Dietyonema, which is the 

 oldest form of the Graptolite group, the rods are held together by 

 very regular processes, that give the whole frond, which is tubular, 

 exactly the aspect of a Fenestella. The presence of the projecting 

 Graptolitoid cells and the horny texture, however, prevent its being 

 confounded with that genus ; but the resemblance is very close, and 

 I think we have here a real affinity, — a conclusion strengthened by 

 the general agreement of the long- celled Graptolites with recent 

 genera of the Tubidiporidce. 



I herewith give figures of the new species of Diehograpsus, Tetra- 

 grapsus, &c. ; and I subjoin a list of all the known Skiddaw slate 

 fossils. Those marked W. were collected by Mr. Bryce Wright ; 

 those marked H. are due to the researches of Prof. Harkness ; and 

 those marked ' West ' are from that gentleman's collection. 



Fossils. Localities neae Skiddaw. 



Radiating Worm -burrows Skiddaw, Longside (H., West). 



Annelid-burrows Hodgson, Holm (W.), Keswick, &c. 



jNereites Skiddaw, Longside (H.). 



New Crustacean — Caryocaris Wrightii, Outerside, Barff, Skiddaw, Longside 



n. s., fig. 15. (W., H., West). 



G-raptolites Sagittarius, His Scawgill, Hakengill, Mirehouse, Brai- 



thwaite Brow (W., H.). 



tenuis, Portl Keswick (W., H.). 



Nilssoni, Barr Braithwaite Brow (W.). 



latus, M' Coy Braithwaite Brow, Whiteless, Scawgill 



(Sedgw.). 



sp Keswick. 



Liplograpsus pristis ?, His Braithwaite Brow (W.). 



Didymograpsus sextans, Hall Braithwaite Brow (W.). 



hirundo (MS.), fig. 13/ Ellengill (W., H.). 



geminus, His., fig. 13 c Eggbeck, Ullswater (H.). 



caduceus, Salter, &g.\3a,b Keswick (H.). 



sp. like G-. Pantoni, M'Coy, fig. 13 e 



(D. V-fractus, MS. ) Keswick (West). 



Phyllograptus angustifolium, Hall, fig. 



7a, lb Barff, Keswick (W.,H.). 



Diehograpsus Sedgwickii, fig. 11 Braithwaite (W.). 



sp., small branches, fig. 12 Keswick (H.). 



Tetragrapsus bryonoides, Hall, fig. 8 «... Frozzengill (H.). 



crucialis. n. s., fig. 8 b Keswick. 



Dichotomous Bryozoon?, fig. 14 Barff, Keswick. 



A few words will suffice to show the relations of this fauna with 

 that of the corresponding beds in other countries. In the grouping of 

 the Graptolites of the Skiddaw slates there is the closest resemblance 

 to that group discovered by Logan near Quebec, and which is known to 

 some authors under the name of the Taconic system. All the forms 

 are representatives in the two cases, and several of the species are, I 

 believe, identical ; but as the Canadian figures have not yet received 

 their long-desired publication, we cannot identify the names except 

 in a few instances. 



Moreover, there is a remarkable coincidence, even to minutiae of 

 character, between the Skiddaw slates and the Graptolite-bearing 

 rocks of Melbourne, Australia. In the collections sent over bv 



