NEW AND LITTLB-KNOWX BBITISH EHIZOPODS. 77 



Observations on some New and Little-known British Rhizopods. 

 By James Meikle Brown, B.Sc, F.L.S. 



(Plate 9.) 



[Read 4th May, 1911.J 



During the examination of Rhizopod material collected from different 

 localities in England and Scotland during the past few years, several 

 interesting species have been obtained which I believe have not received 

 previous notice as occurring in this country, and it seems desirable to put 

 them on record. Some of these species are quite common in certain 

 localities, while others, again, are apparently particularly rare, and do not 

 seem to have been observed since they were originally described some years 

 ago. Others, again, though repeatedly observed by their original discoverer, 

 have not been met with by other naturalists. Further and more extended 

 systematic work in this country will probably show that these last are more 

 common than we at present believe. 



CocHLioPODiUM GRANULATUM, Peimrd. (Plate 9. figs. 1 & 2.) 

 Penard, ' Faune rliizopodique ' &c. p. 194. 



In a collection of sediment containing Amoehce, Pamphagus, &c., considerable 

 numbers of this fine Rhizopod occurred. They were of large size, up to 80 

 or 100 /Li, and in an active state. When disturbed the protoplasmic body is 

 retracted and completely enclosed within the flexible test. In the active 

 state a large mass of protoplasm flows out from the test, forming a broad 

 expansion and giving off numerous pseudopodia. In this state the body ~ 

 plasma shows two distinct regions. 



The included posterior part is greyish and granular, enclosing a distinctly- 

 seen nucleus, which contains one or more " nucleoli,' and in the largest 

 specimens many "nucleoli." Diatoms, green Alg?e, and other food-bodies 

 are enclosed in large numbers. 



The extruded portion is relatively large in bulk. It is clear and hyaline, 

 much vacuolated, and contains a great number of minute, oval, highly 

 refractive bodies in very active movement. These occur in smaller numbers 

 within the inner protoplasm, where they seem to be less active. Vacuolisation 

 is sometimes so marked that the boundaries between the vacuoles are only 

 rendered visible by the presence of these bodies. 



The pseudopodia are numerous and hyaline, often branched^ and in most 

 cases obtuse. The protoplasm also exhibits wave-like outbursts. The test 

 is flexible, def ormable, and in the active animal in the form of a hemispheiical 



