of Recent Brachiopoaa. 365 



8. Terebratula lenticularis, Deshayes, 1830; Sow. Th. Conch. 



pi. 72. fig. 108-110. 

 Hab. Cook's Straits, New Zealand, depth 15 fathoms : this 

 species is found fossil in the island. 



9. Terebratula Grayii, Dav. Zool. Proc. 1852. 

 Hab. Straits of Korea. 



10. Terebratula australis, Quoy, 1834; Sow. Th. Conch, pi. 69. 

 fig. 25, 34. 



Hab. In shallow seas, depth 4 feet ; according to Quoy. Ter. 

 flavescens and dentata, Lam. 1819, and T. recurva, Quoy, are only 

 varieties and malformations. 



II. Genus Tekebratulixa, D'Orb. 1849. 

 Closely allied to Terebratula, but differing in the union of the 

 crural processes, which form a shelly band behind the mouth of 

 the animal, whereas the reflected border of the loop is always in 

 front (below in the figure) of the mouth : in young specimens of 

 the recent T. Caput -serpentis, the crural processes are not joined, 



showing an intimate relation to Terebratula vitrea. The disposi- 

 tion of the ciliated arms is the same as in T. vitrea and australis : 

 the figure has been taken with the cilia a little out of their proper 

 place to show some points more clearly, and especially for com- 

 parison with the type of Argiope. The arms are united by a 

 membrane which. forms aflat disc in Argiope, but here forms 

 three lobes as described under Terebratula. Apart from the 

 peculiarity of the loop, the Terebratulina form a small group, 

 so well characterized by form and sculpture as never to be con- 

 founded with any other. The beak is truncated, and the foramen 

 partly encircled by a deltidium united or disunited in different 

 species ; the two ear-like expansions on the sides of the umbo 

 are also characteristic of this genus. 



A great many recent species have been proposed by various 

 authors, but after a minute comparison of these, they must I 

 fear be reduced to five or six. 



