NOUTHTJMBERLAOT) AND DTJEHAM. 101 



2. GLOBIGERINA, If Orb. 



\ . G. iujlloides, D" 1 Orb. Globigcrina bulloides. Ree. Por. Gt. 

 Br. PL V, figs. 116-118. 



Hare. A few small specimens from Berwick Bay and off' Holy 

 Island, 30 to 35 fathoms. A single example from the Durham 

 coast, off Seaham, 40 fathoms. One specimen from the brackish- 

 water pools in Hylton Dene. 



See remarks on the last named species, Orbulma universa. The 

 brownish mud of which the ocean-" floor" is composed at the 

 greatest depths reached by the sounding-line consists almost 

 entirely of the shells of Globigerina and Orbulina, either whole 

 or in fragments, and represents a condition very similar to that 

 which must have existed when some of the Cretaceous rocks were 

 in process of formation. 



3. TEXTULAEIA, Defrance. 



1. T. variabilis, Will. Textularia variabilis. Rec. For. Gt. 



Br. PL VI, figs. 162, 163, 168. 

 Rare. 



2. T. complexa, uo'V. spec. [PL XII, figs. 6, a.b.] 

 Description. Shell oblong, compressed. The earlier cham- 

 bers taking a helicoid or spiral direction of growth, but assuming 

 the biserial, Textularian arrangement after the formation of five 

 or six chambers. Texture, sub-hyaline, with well defined foram- 

 ina. Colour nearly white. Length -gVth of an inch. 



The polymorphic character of the genus Textularia is well 

 exemplified in the tendency of its various forms to take on a 

 spiral mode of growth. Messrs. Parker and Jones in their paper 

 on Arctic Poraminifera, now in the press, have figured the 

 rougher, more arenaceous varieties so modified. The one now 

 described is nearly related to the Textularia variabilis of Wil- 

 liamson. Ehrenberg in his memoir " LTeber den GrunsancL" pub- 

 lished in the Berlin Transactions for 1855, gives a drawing of a 

 cast of one of these coiled Textularice (plate IY, fig. 13), with 

 the new generic name Spiroplecta, but does not venture on 

 specific characters. 



