KONGL. SV. VKT. AKADEMIENS HANRL'NGAR. BAND. 19. N:O 4. 79 



For the synonymy see under Textul. sagittula. 



Fig. 159: a coarse form, which not (infrequently becomes still rougher and more 

 shapeless, like a small piece of mortar. 



Fig. 160: the bristly and more regularly made form; its Textularia-stage is often 

 very attenuated with the chambers nearly obliterated; the different shape of the aper- 

 ture is also represented. 



Fig. 161: a pigmy-form with a nicely developed Textularia-stage. 1616: the 

 same more magnified. (The penultima-chamber of the Textularia-stage is wrongly 

 represented with an aperture leading to the Nodosaria-stage.) 



Textularia gibbosa D'ORB. forma Bigenerina. 



Tab. V. figg. 162164. 



This form differs from the preceding by its Textularia-stage being more round 

 or distended. Its whole appearance reminds one more of a Clavulina than a Bigene- 

 rina, but its early stage its plainly biserial and generally extremely short, without any 

 external septal impressions or markings, its surface usually being polished and of yel- 

 lowish tint. The Nodosaria-stage is generally more rough (not so smooth as is repre- 

 sented in the pictures). 



The aperture is often replaced by a number of pores; sometimes triangular and 

 provided with a tongue, nearly as in a Valvulina. 



It is not uncommon in the coralline-gravel, fff slender growth, generally of small 

 size, but sometimes attaining a length of 7 mm. 



Figg. 162 163: 2 specimens cut open, with a transvers section, fig. 164, of the 

 Textularia-stage, shewing the biserial arrangement; the different forms of aperture are 

 also represented 



Textularia Pennatula BATSCH. var. aculeata EHRENB. forma Bigenerina. 



Tab. V, figg. 165166. 



It is a pigmy with a thin, glassy shell, which soon becomes nodosarine in growth. 

 Thi.s form may also be considered as a pigmyform of the preceding, Textul. sagittula 

 forma Bigenerina, but not having met with transitory forms between the two we place 

 it as a variety of Textul. Pennatula. REUSS has referred this form to his genus Schizo- 

 phora and GUMBEL to Venilina. It shews some affinity to Bolivina in the poration and 

 the shell-substance. 



It is sometimes provided with a few crescentshaped folds on each segment. 



It is not common in the chalk-ooze. 



Fig. 165: the textularia-stage. 



Fig. 166: its bigenerinaform. 0,42 mm. in length. 



