374 Mr. T. Davidson on some recent 



Plate XXI. 



Fig. 1. Cythere gibbosa (female P), seen from the left side. 



Fig. 2. The same, seen from above. [> X 60. 



Fig. 3. The same, seen from the front. 



Fig. 4. Limnieythere Sancti-Patricii; abdomen of female (?) : a, abdomen ; 



b, postabdominal ramus (?) ; c, copulative organs (?). X 210. 

 Fig. 5. Polycope compressa, seen from the left side. "1 



Fig. 6. The same, seen from above. 



Fig. 7. The same, seen from behind. Y X 60. 



Fig. 8. The same, right valve, from inside, showing hinge-joint I 



and serrulated margin. J 



Fig. 9. The same, superior antenna. j 



Fig. 10. The same, inferior antenna. > X210. 



Fig. 11. The same, postabdominal ramus. | 



Fig. 12. Eucythere declivis, \ar.prava (female), seen from leftside. J 

 Fig. 13. The same, seen from above. - X40. 



Fig. 14. The same (male), seen from the left side. ] 



Plate XXII. 



Fig. 1. Ophimioplus annulosus, fragment of ray, dredged in Birterbuy 



Bay ; natural size. 

 Fig. 2.* The same, disk, seen from above, with one ray ; a little larger than 



natural size. 

 Fig. 3. The same, base of a ray, with portion of disk, seen from below : 



a, madrepore-plate ; b b, smaller, and c c, larger mouth-papilla?. 

 Fig. 4. The same, portion of ray, seen from below, denuded of spines. 

 Fig. 5. The same, from above. 



Fig. 6. The same, transverse section of ray near the middle : «, outer, 



b, inner foot-papillae. (Figs. 2-6 after Sara.) 

 Fig. 7. Exunguia stilipes, upper antenna, X 84. 



Fig. 8. The same, lower antenna, X 84. 

 Fig. 9. The same, maxilliped, X 210. 

 Fig. 10. The same, first gnathopod, x84. 

 Fig. 11. The same, second gnathopod, x84. 



Fig. 12. The same, last segments of bodv, showing telson and uropod, 

 X84. 



XLVL- — Notes on some recent Mediterranean Species of Bra- 

 chiopoda. By Thomas Davidson, F.R.S., F.G.S.", &c. 



While I was recently at Nice, it was suggested by our dis- 

 tinguished naturalist Mr. J. G. Jeffreys that I should carefully 

 examine the original specimens of the Mediterranean species 

 of Brachiopoda described by Antonio Risso*, in order to clear 

 away some uncertainty still prevailing with reference to the 

 correct identification and specific value of that author's species. 

 Risso's knowledge of the Mollusca, both recent and fossil, was 

 considerably inferior to his amount of information regarding 



* Histoire Naturelle des principales Productions de l'Europe Meri- 

 dionale, et particulierement de celles des Environs de Nice et des Alpes 

 Maritimes, vol. iv. 1826. 



