1 UE8JI- WATER A L G X OF THE UNITED STATES. 131 



Long. 00057" 0.0066". Lat. max. 0.00346". 



Syn. i: i-iiliHtyum, (OaiviLLE) KALFS' British Desmidiea, p. 80. 



lla.l>. Klimle Island ; Bailey. 



Frond rather mure than twice as long as broad, smooth, oblong; segments 5-lobed ; lobes nearly 

 rqiml, cuiiftitf ; lateral loUrs, or the basal only, with a broad, shallow, marginal concavity, 

 all their angle.-* ruiiinleil, terminal notch linear. 



limply frond; f. T. seg. punctate, with three large inflations, on surface near the bnsc, t\v> 

 others above and two on terminal lobe ; tr. T. three times as long as broad, with three sul>- 

 distant marginal inflations at each side, and one at each end, in ft, broader in proportion, 

 more elliptic, and inflations close; e. T. end lobe notched at opposite external margin*. 

 Sporangium orbicular, beset with numerous conical tubercles. (A.) 



/.'. Lvbi polares entknter discreti et in apice anguste incisi. 



11. End lobes evidently seftaraied and narrowly incised in the centre. 



E. cra-Mim, (Unto.) KTZ. 



E. oblongum, diametro subtriplo longius, profunde constrictom, sinn an gusto linoari, e vcrtice 

 subquadrungularc, utroque polo profunde excisura, angulis rotundatis; semicellulis (front*) 

 trilubis, basi et in quoque angulo tumore instructis, lobis lateralibus latissirais unisinuatis, 

 lobo polar! paullum prominente, in apice bifido, segmentis late rotundatis; cytiodcrmate dis- 

 tiucte puuctato, punctis in series transvcrsas ordinatis. (R.) 



Long. 0.0051" 0073". Lat. max. 0.0041". (R.) 



$,j,,. E. crassum, (BRtBissoN) KUTZING RAMNHOBOT, Flora Europ. Algarum, Sect. III. 



p. 181. 

 Hab. United States. 



Frond about twice as long as broad, snbquadrilateral, smooth ; segments 3-lobed ; basal lobes 

 very broad, with a very broad, shallow marginal sinus, in which there is sometimes a slight 

 intermediate rounded projection; end lobe creneate, rounded, terminal notch linear. 



Empty frond; f. v. punctate, segments with three inflations below and two above; tr. T. 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 margins. (A.) 



E. omnium. WOOD. 



longum, diametro duplo longius, profunde constrictum, sinu angnsto lincari ; scmicellulis 

 a froute trilobatis; lobis basalibus latwsirais, nonnihil sinuato-emargiuatis, angulis plus minus 

 productis et rotundatis; lobo polar! medio profunde lineare inciso, segmcntis late rotundatis ; 

 semicellulis a latere bilobatis, lobis basalibus profunde emarginatis et cum angulis plus minus 

 acutis; cytiodcrmate distincte ordinatim punctato. 



Diam. TsYoo" = -00029". 



Syn. E. ornatum, WOOD, Proc. A. N. S., 1869. 



Hob. SacoLakc; New Hampshire. Lewis. 



E. oblong, twice as long as broad, profoundly constricted ; semicells from the front trilobate ; 

 basal lobe very broad, slightly sinnately-emarginate, angles more or less produced and 

 rounded ; polar lobe medianly profoundly linearly incised, segments broadly rounded ; semi- 

 cells bilobate at the sides, basal lobes profoundly emarginate and with the angles more or 

 less acute ; cytioderm distinctly regularly punctate. 



Remarks. This species is close to E. crassum, from which it differs in the pro- 

 portionate length, being only twice instead of three times as long as hroad ; in the 

 M/ l.cing only three-fourths as large; and especially in the peculiar lateral split- 

 ting, as it were, of the basal lobes. 



18 July, 187i 



