MACPvTJROUS DECAPOD I1S T THE LOWER CARBONIFEROUS. © / 7 



part, yielded a few specimens of Bdhroplion, and one or two crushed 

 Orthoceratites. 



Locality. — Shore east side of Belhaven Bay, near Dunbar, Had- 

 dingtonshire ; red and mottled shale of the Red Sandstone, or lower 

 group of the Calciferons Sandstone series. 



Collector. — Mr. James Bennie. 



6. Concluding- Remarks. 



If truly a macrurous Decapod, Gitocrangon, Bichter, is without 

 doubt the oldest genus of its order (grauwacke of Saalfeld, ? Upper 

 Devonian). Next to it in age, previous to the discovery of A.I Woocl- 

 ivardi, comes Grangopsis socialis, Salter. This little crustacean was 

 found by the Bev. T. Brown, M.A., at Ardross, Fifeshire, in beds 

 which, according to the mapping of the Geological Survey*, are 

 in the Cement-stone group, or upper division of the Calciferous 

 Sandstone series — but according to Mr. Brown f, in the true Car- 

 boniferous Limestone, 1400 feet above the division between the two 

 series. Prom whichever point of view we regard the geological 

 position of C. socialis, it is quite clear that the horizon of A.? Wood- 

 wardi is defined, and that it must take precedence of C. socialis in 

 antiquity, and rank next to Gitocrangon. 



I have to return my best thanks to my colleagues Messrs. B. N, 

 Peach and B. L. Jack — the former for drawings of AJ? Woochvardi, 

 and the latter for much literary assistance. 



EXPLANATION OF PLATE XXVII. 



AxTIIRArAL.EMON ? YToODWARDI, B. Eth. jl'M. 



Pig. 1. Side view of one half the specimen, in which the thoracic appendages (?) 



are in relief. Considerably enlarged. 

 Fig. 1 a. The same. Natural size. 

 Fig. 2. Corresponding view of the other half, in which the thoracicappendages(?) 



are in cast only. Similarly enlarged. 

 Fig. 3. View of the pressed-out remains of another individual. Considerably 



enlarged. 

 Fig. 3 a. The same. Natural size. 



a. Abdominal somites. 



b. Telson. 



c. Thoracic appendages (?). 



d. Cervical groove. 



e. Middle of cervical groove. 



/. Lateral angles (posterior) of carapace. 



g. Median ridge of carapace. 



h. Lateral ridges. 



i. „ margin of carapace. 



7c. Indication of appendage. 



/. Pleurae of abdominal somites. 



m. Portion of rostrum. 



(N.B. The letters refer to the same parts in all the figures.) 

 * Sheet 41, Scotland. t Trans. Roy. Soc. Edinb. vol. xxii. p. 391. 



