ON FOSSILS OBTAINED AT KILTOKKAN QUARRY. 75 



swimming-foot (ector/nath) , showing very clearly the toothed edges of this 

 masticatory and locomotive organ, another specimen being apparently the 

 lower portion of a similar appendage. In a previous collection made by the 

 Geological Survey are specimens showing the pincers or chelas : in one of 

 these the ciu-ved points of both rami are preserved ; the upper one is seen to 

 be armed with two large tooth-like projections ; the lower one being imper- 

 fect does not show the corresponding parts. 



It is possible aU these fragments may belong to one species, -which I propose 

 to name Ptenjgotus Hlhernicus. Another and distinct crustacean is shown in 

 a well-marked head (or carapace), to which is attached portions of two of 

 the thoracic segments. This specimen I fortunately picked up amongst the 

 debris of the quarry immediately after visiting it. The form of this head, 

 with its central arched divisions, to which the eyes are attached, is not very 

 unlike that of a species of Belhmrus from the Coal-measures ; it is also pro- 

 vided with a border, and its posterior portion terminates on each side in a short 

 spine. I have provisionally named this species Belinurus ? Kiltorlccnsis. 



Some detached body-segments, which were also procured at the same 

 time in the progress of excavation (one of the specimens showing two entire 

 segments, with portions of two others united), may possibly have belonged to 

 the above species. 



In a former collection from this place made by the Geological Survey, 

 there arc three well-defined examples of the detached carapace of a shrimp- 

 like crustacean, which in shape approaches more nearly to that of the Silu- 

 rian than to any of the Carboniferous species, and most nearly to Hymeno- 

 caris of the Lingula-beds. The anterior margin is broad and produced, 

 giving it a curved outline, having a sinus running somewhat parallel and 

 near to it, which is marked near the centre by a small elongated depression ; 

 the surfaces of these fossils are covered by fine labyrinthine markings. One 

 of the fossils recently collected, although differing in shape (which may have 

 arisen from pressure), is probably a carapace of the same species, it being 

 also marked by a similar sculpturing. Some of the detached segments may 

 also belong to this species, which, from its peculiar prow-shaped carapace, 

 I propose to name Prorkaris MacEcnrici. 



Of fish-remains wc were not successful in obtaining many examples on 

 this visit, a few detached scales only having been met with ; those formerly 

 collected are of great interest, and we had hoped to have met with specimens 

 which might have thrown a better light upon some before collected ; in this 

 we were disappointed, but do not despair if another opportunity offers for a 

 more extensive excavation. The fish-remains already obtained consist of 

 large conical teeth, resembling those of Dendrodus or Bot1inolej;ns, detached 

 scales, and a large portion of a fish which appears to be identical with Ghjp- 

 tolepis elegans. The majority, however, appear to be referable to Goccosteus, 

 some of them veiy closely resembling C. decipiens, Ag., especially a mass of 

 plates in juxtaposition, showing the under sides ; they consist, for the most 

 part, of detached plates and jaws with teeth, which also resemble very much 

 corresponding parts figured by Professor Agassiz in his Old-Eed-Sandstone fish. 

 There are also many detached smaller plates, and others with several plates 

 united, which may possibly belong to Pterichthys : as some of the latter are in 

 Prof. Huxley's hands, we may expect some valuable information about them. 



"With respect to the disposal of the specimens, a large number of which 

 were collected, I would beg to suggest that the new species and those 

 required for working out details, should be retained for the Geological Survey's 

 collection in Ireland, and the duplicates distributed to such public insti- 

 tutions as it may be thought desirable to present them to. 



