340 H. 0. Nicholson — Graptolites in the Skiddaw Slates. 



to approach nearest to Arahellites hamatus, Hinde, 1 or even A. cor- 

 nutus, Hinde, 2 and I propose to call it Arahellites bowningensis. 



Form 3. — A jaw-plate with numerous teeth along the superior 

 mai - gin, and a simple, short, blunt hook at the anterior end, hardly- 

 elevated above, or larger than those which succeed it behind. The 

 denticles are eight to ten decreasing in size backwards, sharp, pointed 

 and rather recurved. The upper and lower margins are sub-parallel, 

 and the plate expanding slightly towards the front, whilst the 

 posterior end is rounded. The lower margin has a small appendage 

 projecting below the anterior part of the basal line. 



I take this (Fig. 9) to be a species of GEnonites, and to be near GE. 

 parvulus, Hinde. 3 It is proposed to call the species GEnonites hebes. 



It is hoped that these brief and imperfect notes will be sufficient 

 to call the attention of collectors in New South Wales to these 

 peculiar and interesting little bodies. The Bowning beds are doubt- 

 less not the only portion of the Australian Palaeozoic series in which 

 they occur, and the writer would suggest rigid search being made 

 for their remains in the Upper Silurian rocks so largely developed 

 around Melbourne, in Victoria, amongst other places. 



Localities. — Eunicites Mitclielli, Arahellites bowningensis and GEno- 

 nites hebes are all from the Lower Trilobite bed of Bowning 

 Creek ; but the first named has also been found by Mr. Mitchell at 

 Silverdale, near Bowning. 



EXPLANATION OF PLATE XL r_ size ). 



Fig. 1. A group of plates of Turrilepas Mitclielli, R. Eth., jun. (about twice nat. 

 Figs. 2, 4, and 5. Three separate plates of same species much enlarged. 

 Fig. 3. Turrilepas, sp., also much enlarged. 



All from the Wenlock Limestone, New South "Wales. 

 Figs. 6-10. Jaws of Annelides (much enlarged). t 

 Figs. 6, 7, and 10. Eunicites Mitclielli, R. Eth., jun. 

 Fig. 8. Arahellites bowningensis, R. Eth., jun. 

 Fig. 9. (Enonites hebes. R. Eth., jun. 



All from the Lower Trilobite bed of Bowning Creek, New South "Wales, etc. 



II. — Note on the Occurrence of Trigonograpttjs ensiformis, 

 Hall, sp., and of a Variety of Didymograptus v-fractus, 

 Salter, in the Skiddaw Slates. 



By H. Oliphant Nicholson, Esq. 



I WISH to take the opportunity of recording the occurrence of the 

 above-named Graptolites in the Skiddaw Slates of the Lake 

 District, as they seem of exceptional interest. 



I. Trigonograpttjs ensiformis, Hall, sp. Figs. 1-2. 

 The first of these closely resembles, and is probably identical 

 with, the species described and figured by Hall from the Quebec 

 Group under the name of Betiolites ensiformis, Hall. 4 Professor 

 Lapworth, however, in 1875, for several reasons, transferred Hall's 

 Jxetiolites ensiformis to the genus Trigonograptus, 5 a transference 



1 Q.J.G.S. vol. xxxv. p. 377, pi. xviii. fig. 12, 1879. 



2 Ibid, p. 377, pi. xviii. figs. 13, 14, 15. 



3 K Svenska Vet.-Akad. Handl. 1882, t. 1. 



4 Grapt. Queb. Group, p. 114, pi. xiv. figs. 1-5. 



5 Quart. Journ. Geol. Soc. Nov. 1875, p. 659, pi. xxxiv. figs. 8a-Sc. 



