136 



r.RlTlSlI FEKWHWATEl!, EHtZOrODA. 



Lengtli C)()-M')0 jx. Nuclei /x in diameter. 



HiihUdf. — On A1,o-;b. Fresliwator nnd marine. 



Ii;fj,an]>, — Near the lighthouse, Glare Island, Mayo 

 {Wailr.^ 4- PriKinJ). 



When the test assumes a spherical form the aper- 

 ture is difficult to locate as it l)ecomes a mere slit 

 immersed in the exuding plasma; also the test may 

 be covered l)y extraneous matter (grains of sand, 

 diatoms, etc.) which adhere to it although they are 

 not incorporated with it. In these circumstances the 

 peduncle or raphe may be indistinguishable, consisting 

 as it does of a fine ribbon-like band within the test 





tx^ 



:..-.o 



-/■i 



x^ ■:;.'s# 



Fni. 15fi. — Lichijrlt'i'hniii un'i''ii<:'}-i, without its pseiidopodia.. x aliout 

 2.0O. (After reiiurcl, as L. Jhn-iatis.) 



and lying closely to one side of it for al)ont half its 

 length, its aperture end spreading ont and forming 

 the origin of a very extensive reticidnm. A portion 

 of the plasma often flows around the outside of the 

 test, moi-e or less enveloping it with a coating from 

 which pseudopodia sometimes arise. The nnmerons 

 nnclei are spherical :ind each contains a single nucleole 

 lying at one sid(% sha})ed like the segment of a sphere, 

 so that in bi'oad view they appeal' circular and placed 

 centi'ally in the nncleus, whilst in narrow view they 

 are nearly hemispherical and lie close to one side of 

 it. 'I'o see the nuclei it is frequently' necessary- to 

 ci-usli tli(,' test and ex]>el the plasnnr. In 3'onng indi- 

 viduals Penard luis found two or tlu'ce very small 

 nucleoh'S in each nucleus. 



