196 The Philippine Journal of Science i9i8 



Subphylum SARCODINA — Continued. 

 Class Rhizopoda — Continued. 



Subclass Foraminifera — Continued. 



Order Miliolida. — Shells are calcareous and hyaline. They may be 

 covered with sand or detritus. Lister notes six families. Ty- 

 pical genus, Peneroplis Montfort, 1810. 

 Order Textularida. — Arenaceous forms with or without perforated 

 calcareous base. The chambers are arranged in one or two 

 series. These may be rrregular, alternate, or spiral. Three 

 families. Typical genus, Textularia De.'^rance, 1824. 

 Order Chilostomellida. — Finely perforated polythalamous calcareous 

 tests. Lister names three genera. Typical genus, Chilostomella 

 Reuss, 1860. 

 Order lagenida. — The tests are similar to those of the Chilostomel- 

 lida save for the monothalamous shell. However, this may be 

 compounded by the union of chambers end to end in a straight 

 or curved series. There are no canals and no canalicular 

 skeleton. Four families. Typical genus, Nodosaria Lamarck, 

 1801. 

 Order Globigerinida. — Calcareous perforated tests. The few cham- 

 bers are spirally arranged. No canals or canal systems. No 

 division to families. Typical genus, Globigerina D'Orbigney, 

 1826. 

 Order Rotalida. — Calcareous perforated tests. Chambers are ar- 

 ranged in a spiral and all are visible from one aspect. The 

 more highly developed forms have a canal system in some cases. 

 Three families. Typical genus, Rotalia Lamarck, 1801. 

 Order Nummulitida. — Tests are bilaterally symmetrical (except in 

 Amphistcgina) , calcareous, and filled with tubules. Canal sys- 

 tem in the higher forms. Three families. Typical genus, 

 PolystomeUa Lamarck, 1822. 

 Subclass Amebea. — Characteristic amoeboid forms, naked or testate. 

 This subclass includes the most familiar rhizopods and notably 

 those occurring as parasites of man. The pseudopodia are blunt 

 or lobose and do not form anastomoses. 

 Order Gymnamebida. — The body is naked, though some forms show 

 a hardening or condensation of the cortical plasm to form a 

 membranelike envelope. This order includes several genera, 

 among them being Amceba, Entamoeba, etc., and, provisionally, 

 Neuroryctes. 

 Order Testacea (Thecamebida) . — The organism is amoeboid but is 

 invested with a definite membrane or test. This may be com- 

 posed of a variety of substances cemented to a chitinous base. 

 There is a single opening to the shell through which the pseu- 

 dopodia are protruded. Typical genus, Euglypha Dujardin, 

 1841. 

 Class Actinopoda. — The pseudopodia are fine, raylike, and supported by 

 a central axial filament of stiffened protoplasm, which may be ex- 

 tended from, or withdrawn into, the body. These rods are in 

 close relation to the nucleus or nuclei and probably correspond to 

 the kinetic element in the flagellum seen in the Mastigophora. 



