80 BULLETIN 11, UNITED STATES NATIONAL MUSEUM. 



interior and having several apertures. Such forms occur most com- 

 monly among the fossil series, but are also known as recent species in 

 the East Indies. Therefore the genus Haplophragmium is here re- 

 stricted to those species none of which have been recorded from the 

 North Pacific. 



The planospiral forms are here separated from the trochoid ones, as 

 in the Mollusca, for example, these two types are always distinct, and 

 it has seemed best to keep them so even in the Foraminifera. The 

 uncoiling and closely coiled planospiral forms have also been sepa- 

 rated. A number of previously proposed names have been used. 

 Certain of the genera include species not hitherto described in this 

 group, and which are apparently new. 



After a careful review of the work done by various authors the 

 scheme of distributing the genera of the Lituolidse among the various 

 families with which they are supposed to have affinities, has been 

 avoided. It is less confusing, it seems to me, to keep the family as 

 it now is, especially when the relationships of the arenaceous and 

 calcareous forms are so hazy and uncertain and in other cases when 

 details of structure are carefully considered the apparent likeness is 

 lost. It has seemed best, therefore, to regard the similarity of form 

 as cases of parallelism and not true relationships. 



Subfamily 1. ASCHEMONELLINJE. 



Test composed of agglutinated material, divided irregularly into 

 chambers without definite plan of arrangement. 



The two species of Aschemonella recorded from this area are primi- 

 tive in character. The chamber seems to produce orifices at irregular 

 positions and from any of these a new series of chambers may be 

 initiated, thus giving rise to an irregularly formed test. In this 

 respect these species seem more primitive than the rest of the family 

 and are here separated from them. , 



Genus ASCHEMONELLA H. B. Brady, 1879. 



Astrorhiza (part) Norman, Proc. Roy. Soc. London, vol. 25, 1876, p. 213. 

 Aschemonella H. B. Brady, Quart. Journ. Micr. Sci., vol. 19, 1879, p. 42. — 



Butschli, in Bronns Klassen, unci Ordnungen des Thierreichs, vol. 1, 1880, p. 



195. Type, Aschemonella catenate. (Norman) = Astrorhiza catenata Norman. 



Description. — Test free, composed of a number of tubular or in- 

 flated chambers in a single or branching series, irregular in form and 

 size, walls arenaceous, firm, thin, apertures often several, at the end 

 of tubular necks. 



The two following species were recorded from the material of the 

 Challenger expedition as occurring in the North Pacific. 



