146 BRITISH FRESHWATER RHIZOPODA. 



Genus 28. LEPTOCHLAMYS G. S. West, 1901. 



Leptochlamys G. S. WEST in Jrn. Linn. Soc., Zool. XXVIII 

 (1901), p. 325. 



Test ovoid, slightly oblique, consisting of a thin, 

 transparent, structureless, chitinoid membrane ; the 

 narrower or ventral end slightly produced and minutely 

 expanded, terminating in a mouth which is often 

 placed a little obliquely ; circular in transverse view ; 

 mouth circular. Protoplasmic body completely filling 

 the test ; nucleus very large and situated dorsally. 

 With a single short pseudopodium, broadly expanded 

 and sometimes cordate. Vacuoles entirely absent. 



1. Leptochlamys ampullacea G. S. West. 

 (Plate XXXI, fig. 19; and fig. 103 in text.) 



Leptochlamys ampullacea G. S. WEST in Jrn. Linn. Soc., Zool. 

 XXVIII (1901), p. 325, t. xxix, S. 23-26 ; AVEEINTZEV in 

 Trudui S.-Peterb. Obshch. XXXVI (1906), 2, p. 164; 

 SCHOUTEDEN in Ann. Biol. Lacustre, I, 3 (1906), p. 337. 



Body composed of finely-granular protoplasm, con- 

 taining a large punctate nucleus at the pole away from 

 the mouth ; both green and brown food-particles 

 present in the body-protoplasm. With a single pseudo- 

 podium (sometimes a faint indication of two) well 

 differentiated into a lobe of dull grey endoplasm enve- 

 loped in a larger mass of clear transparent ectoplasm. 



Dimensions : Length of test 48-55 p, ; diameter 

 36-40 p ; of mouth 15-17 /*. 



Glyder Fawr, N. Wales (G. S. West). 



Prof. G. S. West (whose description we quote) 

 found this rhizopod among various algae and Isoetes 

 in the shallow water at the margins of Llyn-y-cwm- 

 ffynon, Glyder Fawr, N. Wales. The structureless test, 

 he says, at first reminds one of Hyalosphenia; but, apart 

 from the entirely different nature of the animal, it is at 



