102 BRITISH FRESHWATER RHIZOPODA. 



Corycia DUJARDIN (pars) in Ann. Sci. nat. (3) XVIII (1852), 



p. 240. (Pre-occupied in Lepidoptera, Hiihn. 1816.) 

 Pam/phagus BAILEY in Amer. Jrn. Sci. XV (1853), p. 341. 



(Pre-occupied in Orthoptera, Thunberg, 1812.) 

 Difflugia SCHNEIDER (pars) in Archiv. Anat. Physio). XXI 



(1854), pp. 204-207. 

 ? Plagiophrys CLAPAREDE & LACHMANN (pars) Etudes Inf. et 



Rhiz. I, 2 (1859), p. 453. 

 Lecythiiun HERTWIG & LESSER in Arch. mikr. Anat. X 



(1874), Suppl,, pp. 117-118. 

 ? Platoun SCHULZE in .Arch, mikr. Auat. XI (1875), pp. 



115-116. 

 Chlamydophrys CIENKOWSKY in Arch. mikr. Anat. XII, 1 



(1875), p. 39. 

 Troglodytes GABRIEL in Morph. Jahrb. I (1876), p. 536. 



(Pre-occupied in Aves, Viellot, 1806.) 

 Phonergates BUCK in Zeits. wiss. Zool. XXX (1878), p. 20. 



(Pre-occupied in Hemiptera, Stal, 1853.) 

 Baileya AVERINTZEFF, communicated by SCHOUTEDEN in Ann. 



Biol. lacustre, I (1906), p. 382; cf. Zool. Anzeig. XXXI 



(1907), p. 246. 

 Trinema PENARD (pars) in Mem. Soc. Geneve, XXXI, i, n 



(1890), p. 186. 



Test consisting of a thin, flexible, homogeneous 

 envelope, colourless or translucent, without adherent 

 particles ; aperture terminal, elastic ; plasma colourless, 

 granular, completely filling the test ; nucleus large, 

 placed posteriorly; pseudopodia numerous, long, 

 branching, delicate, not anastomosing. 



SYNOPSIS OF THE BRITISH SPECIES. 



Envelope hyaline, spherical or pyriform ; plasma clear and 

 colourless with large distinct nucleus. (1) L. hyalinuin. 



Envelope yellow, pyriform; lenticular or arcuate in trans- 

 verse section; aperture small, terminal, pliable. 



(2) L. mutabile. 



Envelope spherical or pyriform, not compressed ; aperture 

 pliable, elastic ; plasma granular, often containing numerous 

 large diatoms, etc. (3) L. gramdatum. 



Envelope pyriform, moderately compressed; furnished with 

 short curved spines. (4) L. spinosum. 



