80 THE FOEAMINIFEEA 



Some little doubt has been thrown on the validity 

 of this genus as a separate type, some supposing it to 

 be a young nubecularian. Becent. (Plate 2, fig. A.) 



Genus Calcituha, Eoboz. 



Test imperforate, normally adherent ; consisting 

 of a series of irregular and lengthened chambers 

 more or less cylindrical, emanating from a central 

 trunk-like segment ; sometimes arranged radially, as 

 in Astrorliiza. Apertures numerous at the terminals 

 of the branches. 



Example. — G.j^olymorpha, Roboz, ' Sitz. Ak. Wiss. 

 Wien,'vol. Ixxxviii. 1883 (1884), p. 420, pi. — , figs. 

 1-16. 



This, the only species of the genus, was discovered 

 by Roboz, attached to alga?, in a marine aquarium in 

 the Institute of Gratz, supplied by material from the 

 Adriatic Sea. 



The shape of the test in Calcituha 'pohimorplia is 

 extremely variable and irregular, and it starts from a 

 young Miliolina-like segment which eventually forms 

 a kind of central core or trunk for the irregular off- 

 shoots of Niibeculai- la-like chambers. A section 

 through the median plane of the test shows the 

 chambers to be connected by a stoloniferous joint, 

 made by the neck of one chamber being thrust, as it 

 were, into the base of the succeeding chamber ; in 

 this latter feature, and also in the presence of 

 numerous circular apertures to the offshoots of the 

 test, this form shows a decided relationship (morpho- 

 logically speaking) with the isomorphs Ascliemonella 



