Mr. C. Spencc Bate on a hpao Oenus of Macrura, 67 



are examined it is found tliat the leaf-scars of Cyclostigma 

 contain three cicatricules similar to those of Bothrodendron. 



EXPLANATION OF PLATE IV. 



Fi<j. 1. Sif/illaria discophom, Konig, sp., nat. size. la. Leaf-scar en- 

 larged and showing the three cicatricnles. Loc. Shale over 

 Whistler Seam, Bonnington Pit, Kilmarnock. Communicated 

 by the Rev. David Landsborongh. Ilor. Lower Ooal-measares. 



Fi(/s. 2-4. Bothrodendron Wdkianum, Kidston, u. sp. 2. Loc. Little 

 Whickhope Burn, near first branch above Cross Sike, Nortli- 

 umberland ; nat. size. 2 a. Leaf-scar, enlarged. Hor. Calci- 

 ferous Sandstone Sei'ies. Communicated by Mr. H. Miller, 

 F.R.S.E. 3. Loc. Railway-cutting between Kates Mill and 

 Boags Mill, Water of Leith, Midlothian. Hor. Calciferous 

 Sandstone Series. Collected by Mr. J. Bennie. Nat. size. 

 Specimen in the Collection of the Geol. Survey of Scotland. 

 3 a. Leaf-scar, enlarged. 4. Loc. Shore, Wardie, Midlothian. 

 Hor. Calciferous Sandstone Series. Nat. size. Collected by 

 Dr. J. M. Macfarlane. 4 a. Leaf-scar, enlarged. 



Fiys. 5-0. Bothrodendron minutifoliiim, Boulay, sp. 5. Loc. Shale over 

 Whistler Seam, Bonnington Pit, Kilmarnock. Hor. Lower 

 Coal-measures. Nat. size. Communicated by the Rev. D. 

 Landsborongh. 5 a. Leaf-scar, enlarged. 5 b. Subepidermal 

 cicatricules, enlarged. 6. Loc. Shale over " Barnsley Thick 

 Coal," Monkton Main Colliery, near Barnsley, Yorkshire. 

 Middle Coal-measures, Collected by Mr. W." Hemingway. 

 Nat. size. 



X. — On a new Genus of Macrura (Ophthalmerjon 

 transitionalis) . By C. Spence Bate, F.R.S. 



[Plate IX.] 



Some short time since a small and much battered Crustacean 

 was sent to me by Mr. George Merritt, with the request that 

 I would inform him what it was. It proved to be new, and I 

 propose to call it Ophthalnieryon transitionalis. 



Unfortunately the specimen had been swallowed by a dol- 

 phin, and had therefore been affected somewhat by the gastric 

 juices of the fish's stomach. Having been preserved in 

 a dry condition, it was consequently very brittle and not in 

 a state fit for examination. I therefore placed it for 

 several weeks in a preparation of glycerine &c. to preserve 

 and soften its texture before subjecting it to the risk of obser- 

 vation. 



Its general appearance is that of a small Brachyurous 

 Crustacean somewhat allied in form to Ebalia in its dorsal 

 aspect. The carapace is about 9 millim. long and as many 



5* 



