86 BRITISH FKESHWATER EHIZOPODA. 



SYNOPSIS OF THE BRITISH SPECIES. 



Test ovoid, tapering both in broad and narrow views 

 towards the aperture ; formed of easily distinguishable circular 

 plates. (1) T. enchelys. 



Test elongate, small, usually homogeneous in appearance. 



(2) T. lineare. 



Test in broad view of nearly equal width, with semicircular 

 ends, and formed of well-marked circular plates. 



(3) T. cornplanatum. 



1. Trinema enchelys (Ehrenberg) Leidy.* 



(Plate XLVII, figs. 1-10 ; PL XL VIII, figs. 1-3 ; 

 and figs. 152 and 153 in text.) 



Dijflugia enchelys 



EHRENBERG (pars) Infusionsth. (1838), p. 132, pi. ix, f. 4 a, b. 

 PRITCHARD (pars) Hist. Infus. (1842), p. 168 ; ed. 2 (1845), p. 168 ; 



ed. 3 (1852), p. 208 ; ed. 4 (1861), p. 553, pi. xxi, f. 19. 

 GRTJBER in Zeits. wiss. Zool. XXXVI (1891), p. 15. 

 Arcella enchelys 



EHRENBERG in Ber. Akad. Berlin, 1844, pp. 256, 338 ; op. cit. 1845, 



pp. 138, 146, 148, 170, 319 ; in Abb. Akad. Berlin, 1847 (1849), pp. 



444, 460, pi. i, ii, f. 63 ; pi. vi, in, f. 64 ; Mikrogeol. (1854), pi. xiv, 



f . 96 b ; pi. xxxix, n, f . 4. 

 PERTY in Mitth. nat. Ges. Bern, 1849, p. 155 ; Kenntn. kleinst. 



Lebensf. (1852), p. 187. 

 Trinema acinus 



DUJARDIN Hist. Zoopb., Infus. (1841), p. 249, pi. iv, f. 1. 

 PERTY Kenntn. kleinst. Lebensf. (1852), p. 187. 

 PURKYNE in Ziva, III (1855), p. 212, f. 2 (4). 



FRESENIUS in Abb. senckenb. nat. Ges. II (1858), p. 223, ff. 25-27. 

 CLAPAREDK & LACHMANN Etudes Inf. et Rbiz. I, 2 (1859), pp. 453- 



456. 



PRITCHARD Hist. Infus., ed. 4 (1861), p. 556. pi. xxi, f. 9. 

 ARCHER in Qrt. Jrn. Micr. ScS. (N. s.), YII (1867), p. 174 ; op. cit. 



XIV (1874), p. 107 ; in Proc. Dubl. Micr. Club, I, 2 (1868), p. 118; 



op. cit. II, 3 (1875), p. 301. 

 BARKER in Qrt. Jrn. Micr. Sci. (N.S.), VIII (1868), pp. 188-189; in 



Proc. Dubl. Micr. Club, I, 4 (1870), p. 181. 

 HERTWIG & LESSER in Arch, inikr. Anat. X (1874), Suppl., pp. 119- 



121. 



SCHULZE in Arcb. mikr. Anat. XI (1875), pp. 104-106, pi. v, ff. 9-11. 

 EYFERTH Einfacb. Lebensf. (1878), p. 34. 

 LEIDY in Proc. Acad. Pbilad. 1874 (1875), p. 227 ; op. cit. 1877 (1878), 



p. 321. 

 GRUBER in Zeits. wiss. Zool. XXXVI (1881), p. 122, pi. iv, ff. 2, 3. 



* Many of the references given under this species may record Trinema 

 lineare Penard. Even when figured it is not always possible to identify 

 the species. Some doubt may also attach to a few of the references under 

 T. lineare. 



