2 INVERTEBRATE ANIMALS. 



body is naked ; and Arcellina, in which the 

 body is protected by a test or carapace. 

 •T Drawings of Protoniyxa, Amoeba, Vampyrella, 

 Difflngia, dc. 



Order FORAMINIFERA. Foramen, an orifice ; 

 fer'o, I carry. Animalcules forming calcareous, rarely 

 arenaceous, shells, found in sponges, sand, etc. The 

 Foraminifera are exclusively marine, and have a world- 

 wide distribution. 



Group 2.— FOEAMINIFERA-IMPERFORATA and allies. 

 The Pseudopodia are'emitted solely from the mouth 



of the last-formed segment of the shell. 

 II Models, by D'Orbigny and Fric, of about forty- 

 six species. Cydoclypeus, specimen If inches 

 in diameter, collected and presented by Dr. 

 Collingwood. 



Upper Compartment. 

 Drawings of Gromia, MUiola, &c.- 



Group 3.— FORAMINIFERA-PERFORATA. 



The Pseudopodia are emitted from the chambers 

 of the perforated shell. 



IT Models, byD'Orbigny and Fric, of about seventy- 

 six species, including Glohigerina and other 

 Rhizopoda, from the deep seas. 

 Upper Compartment. 



Drawings of Carpenteria, Polytrema, d-c. 

 Group 4. — Order RADIOLARIA. Radius, a ray. Rhizopoda, 

 chiefly marine, and generally developing exquisitely 

 formed glassy shells. 



^ Photographic plates of Polycistina , from Bar- 

 badoes. 

 Drawings of Actinopkrys sol. 



