134 THE FOEAMINIFEEA 



sand with little or much calcareous and sarcodic 

 cement, as in Harldonia; of the tests of smaller 

 Foraminifera with or without an admixture of cal- 

 careous mud, as in certain species of IIaploi:)]iraginnnTi 

 found in Glohige^nna Ooze ; of sponge spicules and 

 calcareous mud, as in Meojithax armatus ; or even 

 consisting of tiny fusiform spicules of a calcareous 

 nature formed by the rhizopod itself, as in Carterina 

 spiculotesta. 



The genera belonging to the sub-family Lituolin^ 

 are associated together on account of the general 

 structure of the test, which is coarsely arenaceous. 

 The septation of the test is more often complete, as in 

 Heophax, Haplophragmiuin, and Placopsilina ; but in 

 Lituola, Hajjlostiche, Bdelloidina, Haddonia, and 

 Polijpliragma the chambers are labyrinthic, and con- 

 sequently the septation is interrupted or sinuous. 



The genus Pohjpliragma is here placed with the 

 typical lituolids instead of with the Endothyein/E, 

 since its chambers have this labyrinthic character 

 well developed, and the test presents the ordinary 

 coarse arenaceous appearance, without a prepon- 

 derance of calcareous cement. 



The labyrinthic genera in the Lituolin.e appear 

 to be normally adherent to marine objects, as shells, 

 stones, or algte ; and they are either attached to a 

 partial extent by the proximal end of the test or are 

 adherent along their whole length. 



A thin arenaceous test is a feature of the next 

 sub-family, the Trochamminin.e. The external shell 

 surface is more or less smooth, and the interior is 



