Geographical Distribution of the Terebratulse. 179 



Mag. Nat. Hist. 1850, v. pi. 15. f. 1 j Conch. Icon. pi. 8. 

 f. 31 a,b, c. 



Waltonia Valenciennesii, Davidson. 

 Terebratella Evansii, Davidson. 

 Mag as Evansii, Gray. 

 Aryiope Valenciennesii, Suess. 



Hah. New Zealand. 



Mr. Davidson generously yields to my suggestion that his 

 Waltonia Valenciennesii and Terebratella Evansii are one and 

 the same; the loop has, however, the contracted laminated 

 structure characteristic of Magas, and I agree with Dr. Gray in 

 assigning it to that genus. Professor Suess's assigning it to 

 Argiope is obviously a blunder. Cseveral specimens have come 

 under my notice, all of a bright orange-red colour. 



« 

 30. Terebratula {Magas) crenulata, Sowerby, Thes. Conch, i. 



p. 358, pi. 71. f. 96-98; Conch. Icon. pi. 8. f. 32. 



Terebratella crenulata, Davidson. 

 Magas crenulata. Gray. 



Hab. Santa Cruz, Canaries ; fide Cuming. 



This species has somewhat the appearance of T. {Terebratella) 

 Labradorensis, or of a young T. {Terebratella) Magellanica; but 

 it is convex, and ribbed in both valves, and it has distinctly the 

 contracted laminated apophysis of the preceding species. The 

 recorded habitat is peculiar, and, I fancy, a little doubtful. 



Subgenus 6. Bouchardia, Davidson. 



Apophysis represented by a central septum, with the laminated 

 cross piece of Magas callously produced and thickened into the 

 form of an anchor. 



31. Terebratula {Bouchardia) Cumingii, Davidson, Proc. Zool. 

 Soc. 1852, p. 78, pi. 14. f. 10-16; Conch. Icon. pi. 8. 

 f. 29. 



Terebratella 1 Cumingii, Davidson. 

 Magas Cumingii, Gray. 



Hab. New Zealand. 



This very interesting species is in my opinion neither a 

 Terebratella nor a Magas. It begins to show internally the 

 callous thickening both of the valves and of the apophysis of 

 Bouchardia tulipa, and is, above all, distinguished by the acumi- 

 nated beak and terminal foramen peculiar to that and to the 

 following species. 



