84 BRITISH FRESHWATER RHIZOPODA. 



are however readily distinguished from that genus by 

 the hyaline collar around the aperture of the test and 

 by the absence of any uniformity in the shape or 

 arrangement of the scales which cover the test. From 

 Nadinella this genus is distinguished by the curved 

 neck of the test. 



Three members of the genus have been described, 

 viz. G. cornutus Leidy, G. triqueter Penard, and C. 

 minutus Penard. Only the last named has been 

 recorded from the British Isles. 



I. Campascus minutus Penard. 

 (Plate XL VI, figs. 7-9.) 



Campascus minutus 



PENARD in Rev. Suisse Zool. YII (1899), pp. 58-59, 102, 106, 109, 

 pi. v, ff. 15-17 ; op. cit. IX (1901), p. 231 ; Faune Rim. Leman 

 (1902), pp. 469-470, 4 figa. ; in Proc. Roy. Soc. Edinb. XXY (1905), 

 pp. 593, 601-602, 608 ; Sarcodines grands Lacs (1905), pp. 53-54, 

 110, 119, 126, fig. p. 53 ; Sarcodines in Cat. Invert. Suisse (1905), 

 pp. 96-97 ; in Rev. Suisse Zool. XVI (1908), pp. 461, 465. 



MURRAY in Proc. Roy. Soc. Edinb. XXV (1905), p. 615 ; in Bathym. 

 Surv. Scott. Lochs, I (1913), p. 336. 



ZSCHOKKE in Arch. Hydrobiol. II (1906), p. 6. 



THIEBAUD in Ann. Biol. lacustre, III (1908), p. 66. 



WAILES in Scott. Natur. 1912, pp. 60, 62 ; in Jrn. Linn. Soc., Zool. 



XXXII (1912), pp. 126, 151. 

 Campascus triqueter var. minuta 



AVERINTZEFF in Trudui S.-Peterb. Obshch. XXXVI, n (1906), p. 304. 



Test small, yellow, translucent, retort shaped ; 

 formed of a thin chitinous pellicle with a covering of 

 small, flat, amorphous scales; transverse section tri- 

 gonal with broadly-rounded angles; nucleus grey, 

 granular, containing one or more nucleoles; plasma 

 grey, partly filling the test and containing pheosomes. 

 crystalline bodies, and food-particles ; one contractile 

 vesicle usually present ; pseudopodia straight, usually 

 single. 



Length 50-60 ft; breadth 32-36/x; aperture 10-12/*; 

 thickness about 25 //,; diameter of collar 15-17 ft. 



Habitat. Deep lakes, sphagnum, and aquatic vege- 

 tation. 



