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, ff. 23-26 ; Aveeintzev in 

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

 ScHOUTEDBN in Ann. Biol. Lacu§tre, 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 fi ; diameter 

 36-40 fji ; of mouth 16-17 ja. 



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 Hj/alosphenia; but, apart 

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



