Yol. 54.] PAUNA OE THE SKIDDAW SLATES. 519 



I have observed the same species in the upper part of the 

 Swedish Phyllogrcf^^tus-ski&er, in the zone of Ph. cf. typus^ Hall. 

 The priority of discovery belongs to Dr. Tornqnist, of Lund, and 

 for further details concerning the species we must await his full 

 description. 



Occurrence. — Upper Skiddaw Slates. 



Locality. — Outerside. 



Genus Climacograptus, Hall. 

 Climacograptus Schaeenbergi, Lapw. 



1876. Climacogra'ptus Scharetibergi, Lapw. ' Grapt. of Co. Down,' Proc. Belfast 

 Nat. Field Club, p. 138, pi. vi, fig. 36. 



Several specimens of this species are preserved together on a 

 block of soft shale which is in the Woodwardian Museum. 



The individuals vary greatly in size ; some are very small, only 

 J- inch (4-2 mm.) long, and do not exceed ^^ inch (1*05 mm.) in 

 width. The largest specimens have a length of | inch (17 mm.) 

 and a maximum width of Jg- inch (l'o8 mm.). 



The rhabdosoma is always narrow at its proximal end, but widens 

 gradually in a distal direction ; the width at the proximal end 

 . rarely exceeds gL. inch (-87 mm.). 



The species is characterized by the peculiar nature of its sutural 

 groove. This is deflected from side to side, and from the outer 

 point of each angulation a short horizontal groove runs out at right 

 angles to the general direction of the rhabdosoma. 



The thecse number between thirty-two and thirty-six to the inch 

 (thirteen to fourteen in 10 mm.), the higher number being character- 

 istic of the proximal end ; they consist of short perpendicular tubes 

 whose apertures are slightly introverted. 



Occurrence. — Ellergill Eeds = Upper Skiddaw Slates. 



Locality. — Thornship Beck. 



Genus Cryptograptus, Lapw. 

 (6) Cryptograptus? antennarius (Hall). (Fig. 31, p. 520.) 



1865. Climacograptus antennarius, Hall, ' Grapt. of the Quebec Group,' Geol. 

 Surv. Canada, dec. 2, p. 112 & pi. xiii, figs. 11-13. 

 1868. Diplograpsus antennarius, Nicb. Quart. Journ. Geol. Soc. vol. xxiv, p. 139. 



This species, as jN^icholson has already noted, seems to be abun- 

 dant in the Skiddaw Slate of certain localities, such as Outerside. 

 Almost invariably, however, the specimens are badly preserved, and 

 very little can be made out about the thecae. 



Nicholson states the maximum length as |- inch (15 mm.), but 

 several specimens that I have seen are fully 1 inch (25-4 mm.) long, 

 though there seem to be individuals of all sizes from ^ inch 

 (6*3 mm.) upwards. 



The base shows well, even in badly-preserved specimens, and 

 usually three spinous processes are visible ; the middle probably 

 represents the apertural spine of the sicula (virgella of Tornquist), 



