EIJEORHANIS OCHLKA. 49 



only by the force of gravity and the pseudopodia 

 which pass from it. 



The nucleus is difficult to distinguish ; it is of a very 

 pale colour and has a small central nucleolus. 



The pseudopodia are about one and a half times the 

 diameter of the outer covering in length and have a 

 tendency to originate in groups ; they are not un- 

 frequently forked ; the orifices- in the outer covering 

 through which they pass are not distinguishable. 



Binary fission has been observed and colonies of 

 embryos have frequently been recorded, although for 

 a long time their origin was unknown. These colonies 

 are of fairly large size, have amoeboid movements and 

 radiating pseudopodia; the very numerous individuals 

 composing them are each about 4 /x in diameter and 

 contain a minute golden-yellow or red-coloured globule. 

 Young solitary individuals are met with numerously 

 at times and they range from 7 ^ to 1 ju, and upwards 

 in diameter. 



Archer (1869) described these colonies of embryos 

 under the name of Cystophrys <n-n/<>n, grouping them 

 with similar colonies, Cysfophri/x hwl.-eUana (Archer), 

 Avhich were subsequently found to be the young of 

 Diplophrys arclifri (Baker), described in Vol. Ill of 

 this work (p. 147). Leidy (187 ( J) illustrates a colony 

 of this species, but attributes it to I)'i)>l<>i>linjx im-l/rri, 

 which has analogous methods of reproduction and 

 alimentation, but whose embryos contain grey or 

 yellowish coloured spots. 



The colonies of embryos appear to result from 

 multiple division or gemmation as swarm spores have 

 not been recorded. 



Genus 9. ACANTHOCYSTIS Carter. 



Acanthocystis CARTER Ann. Mag. Nat. Hist. (3) XII, 1863, 

 p. 263. 



Outer envelope formed of a spherical investment of 



4 



