CAMPASCUS MINUTUS. 85 



ENGLAND. -- Windermere, Westmorland (Brown); 

 Dunham Marsh, Cheshire (Cash). 



SCOTLAND. North Uist, Outer Hebrides; Loch 

 Ness, Inverness-shire (Penard). 



The plasma and its inclusions and the nucleus are 

 similar to those of the genus Gijphoderia which have 

 already been described. 



Genus 39. TRINEMA Dujardin, 1841. 



Dijflugia (pars) EHRENBKRG Infusionsth. (1838), p. 132. 

 Trinema DUJARDJN Zooph., Infus. (1841), p. 249. 

 Arcella (pars) EHRENBERG in Ber. Akad. Berlin, 1844, 

 p. 256. 



Test small, hyaline, oviform or elongate, com- 

 pressed anteriorly, covered with circular silicious 

 plates ; aperture circular, oblique, invaginated ; plasma 

 colourless, granular; nucleus of moderate size with 

 one or more nucleoles, placed posteriorly ; pseudo- 

 podia filose, of extreme tenuity, usually few and 

 unbranched. 



This genus is generally distributed and is usually 

 numerously represented in any gathering of moss or 

 sphagnum. 



Ehrenberg gave names to various forms which can- 

 not now be identified ; Leidy included under the 

 name of T. enchelys two other species which have 

 since then been given specific names by Penard and 

 seem clearly differentiated ; these three species are 

 the only members of this genus which have, up till 

 now, been recorded from the British Isles. 



T. verrucosum France (1897) has a test sparsely 

 covered with silicious nodules. 



T. spinosum Penard (1890) is Pamphagus armatus 

 Lauterborn (Lecythium spinosum of this work). T. 

 Sauvenati Certes (1889) is not a Rhizopod but a 

 Rotifer. 



