THE FAMILY LITUOLID^E 143 



almost confined to recent deposits, usually in the 

 neighbourhood of coral reefs. Its range in depth is 

 from 25 to 63 fathoms. (Plate 7, fig. I.) 



Genus Haddonia, Chapman. 



Test calcareo-arenaceous ; adherent and sinuous ; 

 the commencement sometimes straight, sometimes 

 spiral. Chambers linear and narrower in the line of 

 growth than laterally. Sutures roughly parallel, but 

 sometimes quite irregular. Chambers imperfectly 

 septate or coarsely labyrinthic. Shell- wall per- 

 forated by a series of coarse pores. Aperture a 

 crescentic or horseshoe-shaped slit. 



Example. — H. torresiensis, Chapman, ' Journ. Linn. 

 Soc. Lond., Zoology,' vol. xxvi. 1898, p. 454, pi. xxviii. 



This species was originally found in abundance 

 affixed to a mass of rough coral rock from Torres 

 Strait. It has since occurred in considerable numbers 

 from the reef of the Funafuti atoll. The colour of 

 the shell-wall is from whitish to cream colour or pale 

 brown ; the breadth of the chambers about twice 

 their height, here and there subdivided obliquely, 

 somewhat in the manner of Textularia, but very 

 irregularly, the general plan being a moniliform 

 series of segments. Aperture usually crescent-shaped, 

 sometimes gaping, but more often having a valvular 

 flap, formed by a prolongation of the superior surface 

 of the test, which nearly closes up the orifice, as in 

 Valviilina and certain of the Miliolince. Recent. 

 (Plate 7, fig. K.) 



