196 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Jan. 8, 



Note on some Brachiopoda collected by Mr. Jttdd from the Jurassic 

 Deposits of the East Coast of Scotland. By Thomas Davidson, 

 Esq., F.R.S., F.G.S.* 



[Plate V1TI.] 



Among the Brachiopoda collected by Mr. Judd from the Jurassic 

 deposits of the north of Scotland we find four species particularly 

 worthy of notice. Two are, as far as 1 am aware, quite new, and 

 two new to Great Britain. Three of the four have likewise been 

 obtained from the Upper Oolite or equivalent of the Kimmeridge 

 Clay ; and this is the more remarkable since the species of Brachio- 

 poda recorded from that formation are comparatively few. 



Bhynchonella Suthereandi, n. sp. PL VIII. figs. 1, 2. 



Shell transversely oval, wider tban long, greatest breadth about 

 tbe middle. Ventral valve convex ; sinus wide, moderately deep ; 

 foramen rather small, placed under the incurved extremity of the 

 beak, surrounded and slightly separated from the hinge-line by a 

 deltidium of small dimensions. Dorsal valve deeper and more con- 

 vex than the opposite one, sometimes very gibbous, and divided 

 into three portions, the central one being formed by a wide mesial 

 fold. Surface of each valve marked with from sixteen to thirty 

 large angular ribs, of which from six to twelve occupy the fold, five 

 to thirteen the sinus. Proportions very variable. A large speci- 

 men measured 2| inches in length by 2% inches in breadth. 



Obs. This is one of the largest species of the genus with which I 

 am acquainted, having been exceeded in size, as far as I am aware, 

 only by the R. multicarinata, ~L&m., = Terebratula peregrina, v. Buch, 

 and the R. inconstans speciosa of Miinster. In external shape and 

 character it most nearly approaches the smaller R. Renauxiana, 

 D'Orb., from the Upper Neocomian of the south of France. It 

 varies likewise very much in the number and strength of its ribs ; 

 but this is a feature common to almost every species of the genus. 



R. Sutherlandi appears to be a common shell in the grey Upper 

 Oolite limestone at Garty, in Sutherland, the specimens figured having 

 been communicated by the Rev. J. M. Joass from the Dunrobin 

 Museum. We have named it after His Grace the Duke of Suther- 

 land, in humble appreciation of the service he is rendering to 

 science by the formation of a local museum at Dunrobin. 



Terebrattjla Joassi, n. sp. PL VIII. figs. 3, 3a. 



Shell longitudinally oval, broadest anteriorly, slightly tapering at 

 the beak. Valves very moderately convex, without fold or sinus ; 

 beak small, incurved and truncated by a circular foramen, slightly 

 separated from the hinge-line by a deltidium in one piece. Dorsal 

 valve sometimes very much flattened. Surface smooth, marked by 

 concentric lines of growth. Length If inch, breadth 1| inch, 

 depth |-. 



Obs. The species which this shell most nearly approaches is the 



* Eead March 12, 1873. 



