THE FAMILY LITUOLID^ 151 



found it in the Pacific Ocean from 600 to 1,200 

 fathoms, and in the Caribbean Sea and the Gulf 

 of Mexico from 200 to 1,800 fathoms. The 

 ' Challenger ' obtained it from the N. Atlantic from 

 450 fathoms and deeper, and from the N. Pacific 

 in the very deep area at 3,125 fathoms. It has been 

 found as far north as the southern coast of Norway 

 and the Faroe Channel. Carboniferous to llecent. 

 (Plate 8, fig. D.) 



Genus Trochamniina^ Paeker and Jones. 



Test free, or rarely adherent ; rotaliform, 

 nautiloid, or trochoid ; more or less distinctly 

 septate. Loiver Lias to Recent. 



This genus was subsequently restricted in its 

 meaning from the original sense intended by Parker 

 and Jones by H. B. Brady, who found it necessary 

 to distinguish between the non-septate and the 

 septate forms of finely arenaceous Foraminifera. 



Example. — T. lituiformis, Brady, ' Quart. Journ. 

 Micr. Sci.' vol. xix. N.S. 1879, p. 59, pi. v. fig. 16. 



Test free, crozier-shaped ; consisting of an 

 irregularly septate or pseudo-septate tube, spiral at 

 its commencement, subsequently linear. 



Other well-known modifications of Trochammina 

 are T. squaiuata, Jones and Parker, isomorphous 

 with the thin trochoid DiscorhincE and T. injiata 

 (Montagu), isomorphous with Discorhina rugosa. 



T. Jituiforrnis is a recent species only, and was 

 found in depths varying from 390 to 900 fathoms. 

 (Plate 8, fig. E.) 



