18 THE FOEAMINIFEEA 



by Claparede and Lachmann in 1858-0. They 

 divided the group into four Orders — I. Photeina 

 (inchiding Amoeba and Actinopliyys) ; IT. Echino- 

 CYSTiDA (Badiolaria) ; III. Gkomid.e {Gromia) ; 



IV. FOEAMINIFERA. 



The arrangement pubhshed by Dr. Carpenter in 

 1862 is one even now followed, with certain modifica- 

 tions — I. LoBOSA ; II. Eadiolakia ; III. Keticulosa 

 (afterwards altered by Carpenter to Keticularia). 



It will be observed that the group of the Ehizo- 

 PODA in these systems of classification comprise 

 almost the whole of Eay Lankester's division of the 

 Gymnomyxa. 



The following in detail is one of the latest 

 arrangements of the Rhizopoda, viz. that of Parker 

 and HaswTll in their ' Textbook of Zoology ' (vol. i. 

 p. 46) :— 



Class RHIZOPODA. 



Order 1. Lobosa. — Rhizopoda with shoi't blunt 

 pseudopods. 



Order 2. Labyrinthulidea. — Rhizopods having a 

 network of fine pseudopods, in which corpuscles 

 travel to and fro. 



Order 3. Foraminifera. — Shelled Rhizopoda 

 with fine branched and anastomosing pseudopods. 



Order 4. Heliozoa. — Rhizopoda with fine stiff 

 radiating pseudopods. 



Order 5. Radiol aria. — Rhizopoda having a shell 

 in the form of a perforated central capsule, and 

 usually in addition a siliceous skeleton. The pseudo- 

 pods are long and delicate. 



