FORAMINIFERA OF THE PHILIPPINE AND ADJACENT SEAS. 35? 

 Calcarina his pida— Material examined. 



Genus SIDEROLITES Lamarck, 1801. 



Siderolites Lamarck, Syst. Anim. sans Vert., 1801, p. 376 (type, S. calcitra- 

 poides Lamarck). 



From a study of material from Maestricht, the type locality for 

 this genus, and the type species, it is evident that the genus Sidero- 

 lites can be used in the present case. It is a test much like Calcarina 

 but with a more accelerated development. The early chambers are 

 close-coiled, rotaliform, then later with numerous large, irregular 

 chambers, coarsely punctate, between which as support to this loose 

 tissue ai'e large bosses, starting near the center and growing radially to 

 the periphery, made of solid shelly material, not very evident in well- 

 preserved specimens, but becoming very distinct when erosion takes 

 place; the periphery usually with three or four blunt spines, not in 

 one place, but extending radially; apertures in the young, as in 

 Calcarina, but in the adult formed by the coarse perforations of the 

 outer chambers. 



This is the genus to which it seems the Calcarina tetraedra of 

 Giimbel should be referred, as well as the common Philippine species 

 which seems to be identical with Giimbel's species. The genus goes 

 back at least to the Eocene, and in the present oceans seems to be 

 limited so far as is known to the general Philippine region. 



Carj)enter " figures well the characteristic structure of this genus, 

 which he refers to as "Philip])ine variety" of Tinoporus haculatus. 



«i Introd. Foram., 1862, pi. 15, fig. 10. 



