138 BRITfSH FRESHWATER RHIZOPODA. 



Gromia oviformis having been made the type of the 

 genus Gromia, as explained above (p. 127), Dujardin's 

 G. fluvialis, which has reticulated pseudopodia, should 

 be taken as the type of the genus Allogromia. There- 

 fore the original figures of Gromia. fluvialis are here 

 reproduced (fig. 157). There is no similitude between 

 these and the figure given by Claparede & Lachmann 

 of LieberJcuehnia wageneri (see fig. 155, p. 135), nor is 

 there between the descriptions of these species, and 

 they are here treated as distinct, not only specifically 

 but also generically. 



The genus Allogromia contains six species, of which 

 four are exclusively marine. 



SYNOPSIS OF THE BRITISH SPECIES. 



Test large, 80-120 /it in length. (1) A. fluvialis. 



Test small, about 30 n in diameter. (2) A. stagnalis. 



1. Allogromia fluvialis (Dujardin) Rhumbler. 

 (Figs. 157 and 158.) 



Gromia flu vialis 



DUJARDIN in Ann. Sci. nat. (2) VIII (1837), pp. 311-312, pi. ix, f. 2 ; in 



Pr.-Verb. Soc. Philom. Paris; 1838, p. 7 ; in Institut, VI (1838), p. 47. 

 GERVAIS in Ann. fran?. etrang. Anat. II (1838), pp. 128-129. 

 STEIN Org. Infus. (1859), p. 25. 

 Gromia fluviatilis 



OKEN in Isis, 1839, col. 356. 



DUJARDIN Hist. nat. Zooph., Infus. (1841), p. 255, pi. i, f . 17 ; pi. ii, 



ff. 1, 2. 



RICHARDSON in Micr. Jrn. 1841, pp. 26-27. 

 PERTY Kenntn. kleinst. Lebensf. (1852), p. 188. 

 GRIFFITHS & HENFREY Microg. Diet. (1855), p. 299, pi. xxiv, f. 15 ; 



ed. 4 (1883), p. 366, pi. xxxi, f. 15. 

 ARCHER in Qrt. Jrn. Micr. Sci. (N. s.) VI (1866), p. 185 ; op. cit. (N. s.) 



IX (1869), p. 390 ; in Proc. Dubl. - Micr. Club, I, 2 (1868), p. 51 ; 



op. cit. II, 2 (1874), p. 129. 

 SCHOCH Mikr. Thiere Siisswass.-Aq. I (1868), p. 15, pi. i, f . 5 ; in 



Neuj. nat. Ges. Ziirich, 1870, pp. 4-6, pi., f. 1. 

 EYFERTH Einfach. Lebonsf. (1878), p. 34 ; op. cit., ed. 2 (1885), p. 52 ; 



ed. 3 (1900). p. 270. 



GREBFF in Sitzb. Ges. Nat. Marberg, 1888, p. 120. 

 CUNEO in Boll. Scient. XII (1890), p. 142. 

 LE DANTEK in Compt. rend. Acad. Sci. CXIX (1894), p. 1279 ; in Jrn. 



B. Micr. Soc. 1895, p. 185 ; in Bull. sci. France Belg. XXVI (1895), 



pp. 56-90, ff. 1-7 ; in Feuille Naturel. (3) XXVI (1895^ pp. 57-58. 



