112 BRITISH FRESHWATER RHIZOPODA. 



2. Nuclearia conspicua Gr. S. West. 

 (Plate XIII, fig. 1.) 



Nuclearia conspicua Gr. S. WEST in Journ. Linn. Soc., Zool. 

 XXIX (1903), pp. 109, 111, t, xiii, ff. 16-19. 



Protoplasmic body sub-globose or angularly rounded; 

 protoplasm undiffereiitiated, granulose, containing nu- 

 merous large vacuoles, with a single large spherical 

 nucleus which exhibits a punctate appearance ; pseu- 

 dopodia fairly numerous, stout, rigid, generally with 

 one or two branches which are a little divergent and 

 attenuated to fine points. 



Dimensions: Diameter of body 83-1 20 /A; length of 

 pseudopodia 17-54 /A. 



In boggy pools, Lewis, Outer Hebrides (G. 8. West). 



This rhizopod, Prof. G. S. West (whose description 

 we have quoted), records having found in considerable 

 profusion amongst numerous desmids and other alga? 

 in small pools. The animals, he says, "are of much 

 larger size than N. delicatula Cienk., or N. simplex 

 Cienk., and the protoplasm is much more vacuolated. 

 There is a single nucleus present in each individual, 

 but no contractile vacuoles were observed. The pseu- 

 dopodia are protruded irregularly from the surface of 

 the body-protoplasm, often in small clusters. They 

 are broad at the base, generally straight and much 

 attenuated, and almost always branched. Except for 

 their perfectly smooth exterior and absence of granules, 

 they are very like those present in the genus Vampy- 

 rella." The species is a voracious feeder. 



Genus 14. ARCHERINA Ray Lankester, 1885. 



Archerina RAY LANKESTER in Q. J. Micr. Sci. XXV, n.s. 

 (1885), p. 61. 



Body spherical, minute, furnished with long, delicate, 

 radiating pseudopodal filaments, one or more large 

 vacuoles, and a single bifid chlorophyl corpuscle, which 



