'28 



SYSTEMATIC HISTORY OF THE INFUSORIA. 



obscurely bipartite, and their subdivisions | (Ealfs), granules larger, giving a dentate 

 emarf/mate, or with merely a slight cetitral \ appearance to the margin, otherwise as a. 

 coneavity ; angles rounded ; end-lobe at i y (Archer), gTanides giving a rough ap- 

 externai margin considerably the broadest. | pearance to the margin, lobes slightly 

 L. 1-147"; B!^ 1-209". G.B., I. a (Ralfs), concave, margins rounded, not bipartite, 

 granules like mere pimcta, lobes slightly i ^vdthout emarginate subdivisions, 

 bipartite, subdi^-isions emarginate. ^ ; 



Genus EUASTRUM (Ehr.). — Erond longer than broad, compressed ; deeply 

 constricted into two lobed or sinuated segments ; segments usually p^Tamidal, 

 5- or 3-lobed or merely ^mxao^x^, 2^ossessing variously disposed circular inflated 

 protuberances (veiy rarely absent) ; lateral lobes opjyosite, very rarely radiant, 

 rounded or sinuated at the extremities ; end lobes acutely incised or emargiyiate 

 at the centre, rarely only concave ; central constriction linear. (The inflated 

 protuberances and the emarginate ends rarely (if ever?) simultaneously 

 absent.) 



* Segments deeply lobed; separating si- 

 nuses directed inwards and downwards ; 

 the end lobe cuneate and partly included 

 within the notch formed by the projection 

 of the lateral lobes. 



EuASTRUM verrucosum (Ehr.). — Frond 

 somewhat longer than broad, rough all 

 over with conic granides ; segments 3- 

 lobed, somewhat divergent, all the lobes 

 broad, cuneate, with a very broad shallow 

 external sinus (ab, c). 



Empty frond : f.v. segments with one 

 large circular basal inflation on surface, 

 one smaller on each side, and two others 

 on the end lobe ; s. v. segments inflated at 

 the base, narrowed into a short neck, end 

 dilated with a central sinus ; e.\. oblong, 

 with three inflations at each side, one at 

 each end, end lobe having 4 divergent 

 lobelets. L. 1-267"; B. 1-270". Cos- 

 marium verrucosum (Menegh.), E. papu- 

 losum (Kg.). G.B., I., G., F., Italy, 

 U.S.A. 



E. oblongum (Ralfs). — Frond rather 

 more than twice as long as broad, smooth, 

 oblong ; segments 5-lobed ; lobes nearly 

 equal, cuneate ; lateral lobes, or the basal 

 only, with a broad, shallow, marginal 

 concavity, all their angles rounded, ter- 

 minal notch linear (a, b,c). 



Empty fi'ond : f. v. seg. pimctate, with 

 three large inflations on smface near the 

 base, two others above and two on ter- 

 minal lobe ; tr. v. three times as long as 

 broad, with three subdistant marginal 

 inflations at each side, and one at each 

 end, in /3 broader in proportion, more 

 elliptic, and inflations close ; e. v. end 

 lobe notched at opposite external mar- 

 gins. Sporangium orbicular, beset with 

 numerous conical tubercles. L. 1-156" ; 

 B. 1-282". {iuA\.) = Echinella oblonga 

 (Ch-cv.); Euastrum Pecten (FAiw); Cosma- 



7'ium sinuosum (Corda) ; Eidomia oblonga 

 (Harv.). G.B., I., F.,G., Italy, U.S.A. ^ 

 smaller, narrower, middle lobes rounded, 

 without any marginal concavity. 



E. crassum (Kg.). — Frond about twice 

 as long as hxoeidL,subquadrilateral,Bm.ooth.; 

 segments 3-lobed ; basal lobes very broad, 

 with a vei'y broad, shalloio marginal sinus, 

 in which there is sometimes a slight in- 

 termediate rounded projection ; end lobe 

 cuneate, roimded, terminal notch linear. 

 {ab, c.) 



Empty frond : f. v. punctate, segments 

 "^dth three inflations below and two 

 above ; tr. v. two or three times longer 

 than broad, with three lobes or inflations 

 at each side and one at each end ; e. v. 

 end lobe sinuate at opposite external 

 marffms. L. 1-193"-1-132" ; B. 1-263". 

 =^.Pelta (Hass.). G. B., I., F., G., 

 U. S. A. ^ smaller, margins of lateral 

 lobes more concave, sinuations between 

 the lateral and end lobes more closed, 

 the latter more included. 



E. cornutum (Kg.). — Frond abouttwice 

 as long as broad: segments 3-lobed, some- 

 what inflated at base, outer tipp)er angles 

 of based portion prolonged into a process- 

 iike projection directed upwards ; end 

 lobe included, its notch broad, concave. 



Empty frond punctate, {ab, c.) G. 



2 * Segments sinuously lobed, or tapering; 

 end lobe exserted and united to the basal 

 portion by a distinct neck. 



t End lobe with a linear or acute notch. 



E. 2nnnatum (Ralfs). — Frond oblong, 

 about twice as long as broad ; segments 

 5-lobed in a pinnatifid manner, basal 

 lobes slightly emarginate, middle smaller, 

 rounded, entire, end lobe exserted, di- 



