KHIZOPODA. 83 



Sipkonia (Parkinson). Mass polymorphous, free or fixed, ramose or 

 simple, concave or fistulous above, porous at the surface, and penetrated 

 by anastomosing canals, which terminate in sub-radiating orifices within 

 the cup. 



Myrmecmm (Goldfuss). Mass sub-globular, sessile, of a close fibrous 

 texture, forming ramified canals which radiate from the base to the 

 circumference. Summit with a central pit 



ScypJiia (Oken). Mass cylindrical, simple, or branched, fistulous, 

 ending in a large rounded pit, and composed entirely of a reticulated 

 tissue. 



Eudea (Lamouroux). Mass filiform, attenuated, sub-pedicellate at 

 one end, enlarged and rounded at the other, with a large terminal pit ; 

 surface reticulated by irregular lacunae, minutely porous. 



Halirrhoa (Lamouroux). Mass turbinated, nearly regular, circular, 

 or lobate ; surface porous ; a large central pit on the upper face. 



Happalimus (Lamouroux). Mass fungiform, pedicellate below, ex- 

 panding conically, with a central pit above ; surface porous and irre- 

 gularly excavated. 



Cnemidium (Goldfuss). Mass turbinate, sessile, composed of close 

 fibres and horizontal canals, diverging from the centre to the circum- 

 ference ; a central pit on the upper surface, cariose in the exterior and 

 radiate at the margin. 



lerea (Lamouroux). Mass ovoid, sub-pedicellate, finely porous; 

 pierced on the upper part by many orifices, the terminations of the 

 internal tubes. 



Tethium (Lamarck). Mass sub-globose, tuberose, composed of a 

 cariose firm substance, strengthened by abundance of siliciary spicula, 

 fasciculated, and diverging from the centre to the circumference. 



RHIZOPODA. 



Gervais and Van Beneden include under the name of RMzopods, or 

 foot-rooted animals (so called fromptfa, root; TTOU?, TroSo?, footed ani- 

 mals), those of the simplest organization, which may be characterised 

 by the absence of distinct digestive cavities, and the presence of vibratile 

 cilia, as well as by the soft parts of their tissues. This tissue emits 

 prolongations or filaments which admit of easy extension, sometimes 

 simple, sometimes branching. Occasionally we see these branching 

 filaments withdraw themselves towards the mass of the body, disappear, 



*G 2 



