xin,D,5 Haughwout: Protozoa of Manila and Vicinity: I 197 



Subphylum SAECODINA — Continued. 

 Class Actinopoda — Continued. 



Subclass Heliozca. — Mainly inhabitants of fresh water, few marine 

 forms being known. They are characterized by the absence of 

 a central chitinous capsule between the endo- and ectoplasm. 

 Order Aphrothoraca. — These forms are naked except during encyat- 



ment. Typical genus, Actinosphserium Stein, 1857. 

 Order Chlamydophora. — The animal is invested with a felted fibrous 

 or soft gelatinous covering. Typical genus, Heterophrys Archer, 

 1865. 

 Order Chalarathoraca. — The covering is siliceous and is made up of 

 loosely connected or separate spicules. Typical genus, Acantho- 

 cystis Carter, 1863. 

 Order Desmothoraca. — The covering is of one piece and is perforated 

 by numerous openings. Tjrpical genus, Clathrulina Cienkowsky, 

 1867. 

 Subclass Radiolaria. — These forms are characterized by the presence 

 of a firm chitinous capsule separating the endo- and ectoplasm. 

 This capsule is perforated in different ways for communication 

 between the inner and outer plasm. Exclusively marine forms, 

 pelagic or suspended at various depths. Some are abyssal. This 

 classification is based on Haeckel's Challenger monograph. 

 Division A. Porulosa. — Spherical foims. The central capsule is 

 spherical and is perforated by numerous minute pores. 

 Legion 1. Peripylea (Spumellaria). — The pores in the central cap- 

 sule are evenly scattered. A skeleton usually is present; it 

 is composed of scattered or fused spicules or of a latticed net- 

 work. 

 Order Collida (Brandt). — With or without skeletogenous spicules. 

 Solitary forms. Typical genus, Thalassicolla Huxley, 1851. 

 Order Spherozoea (Brandt). — Colonial forms. With or without 

 skeletogenous spicules. Typical genus, Collozoum Haeckel, 

 1862. 

 Order Spheroida. — The skeleton occurs as one or several con- 

 centric spherical, latticed, or reticulate structures. Typical 

 genus, Actinomma Haeckel, 1862. 

 Order Prunoida. — Characterized by spheroidal, ellipsoidal to 

 cylindrical skeleton, single or concentric, occasionally con- 

 stricted. Haeckel names seven families. Typical genus, 

 Druppula Haeckel, 1887. 

 Order Discoida. — With discoidal to lenticular skeletons and cen- 

 tral capsules. Haeckel names six families. Typical genus, 

 Cenodiscus Haeckel, 1887. 

 Order Larcoida. — The skeleton, which is ellipsoidal with asymme- 

 trical axes, forms almost a spiral in some cases. Haeckel 

 names nine families. Typical genus, Pylonium Haeckel, 

 1881. 

 Order Spheropylida (Dreyer). — In addition to the usual distri- 

 buted pores, there is one basal, or a basal and an apical 

 opening to the central capsule. Typical genus, Spheropyla 

 Dreyer, 1888. 



