45 



J 



Cosmarium, Corda. The following we1*e collected in ponds, partly 

 in New Jersey and partly in Penn. — C. sinuosum, Lund. A small 

 variety. — C. tumidum, Lund.^ — C. tinctum, Ralfs. — C. Smolandi- 

 cum, Lund. — C sulcatum, Nordst. — C. venustumj Breb, — C. po- 

 lygonum, Naeg. — C. homalodermum, Nordst. A small form. 

 Coll. H. S. Kitchell, Conn. — C. parvulum, Breb. — C. crucia- 

 tum, Breb. — C. Ungerianum, Naeg.=C. oligogongrus, Reinsch. — 



C. Ralfsii, Breb.=C. Meriani, Reinsch, var. pentagona, Nordst. 



C. Turpinii, Breb- — C. Hammeri, Reinsch. — C. anisochondrum, 

 Nordst. — C. Thwaitesii, Ralfs, var. Holmiense. Coll. R, Hitch- 

 cock, New York. 



Euastrum, Ehrb.— E. affine, Ralfs.— E. Pokornyanum, Grun.— E. 



abruptum, var. evolutum, Nordst. — E. binale, var, insulare, 

 Wittr. 



E, Donnelli n. sp. E. mediocre, late ovatum, longius quam 

 latius ; medio profunde constrictum, sinu angusto lineari ; sem- 

 icellulis trilobis ; lobis basilaribus, orbiculo-tumidis ; lobo polari 

 subito contracto (semi-diametro) sub-hemisphaerico ; dorso sub- 

 truncato. Lobis singulis in margine cum mucronibus tribus vel 

 quatuor armatis. Semi-cellulis singulis cum quinque tumoribus 

 instructis ; tribus in seriem simplicem transversam in inferiore 

 parte, duabus in superiore parte. Cytiodermate subtih'ter puncta- 

 to. Diam. long. .00216"; lat. 0018". Hab. Florida. Coll. J. 



D. Smith. 



E, formosian, n. sp. E. mediocre, diametro subduplo longius, ova- 

 le ; semi-cellulis sex marginalibus lobis, vel prominentiis; sinibus 

 introrsum rotundatis ; lobis in apice profundis trifidis, vel triden- 

 tatis; dente centrali recto, et lateralibus divergentibus ; lobis 

 inferioribus plus minus elementariis. Cytiodermate laevi. Di- 

 am. long. 0025''; lat. 0016". Hab. Ponds, near Toms River, 

 New^ Jersey. 



Micrasterias, Ag.— M. mucronata, Dixon.— M. angulosum, Hantzsch. 



J/. Kitchellii^ n. sp. - M. magna, circiter tarn ionga quam lata, 

 sinu acuto, introrsum valde amplicato; semi-cellulis profunde 

 trilobis; lobis basilaribus sub-conico-productis, obh'que et late 

 truncatis ; angulis duobus spinis divergentibus armatis; lobo po- 

 lari a lobis basilaribus sinu amplo ac rotundato discreto, vertice 

 plus minus convexOjUtrinque duabus spinis divergentibus armato. 



Diam. lobis basilaribus lat. .005"; lobis polaribus .003''. Cell, 

 long. .005". 



The general outline of this plant is near Af. adscendens^ Nordst. 

 found on the Sandwich Islands, but it is larger, the polar lobe is 

 more exserted, and hence the sinuses between it and the basal 

 lobes are much w^ider and deeper, broadly rounded, not '* amplo- 

 acutangulo." The angles are not bidentate, but are furnished 

 wdth two diverging spines. Collected by H. S. Kitchell in a small 

 pool adjoining Gelder's Pond, on Mt. Everett, Mass., about rSoo 

 feet above sea level. 



M. fimbriata, Ralfs, var. nuda^ n. var, M. permagna orbi- 

 cularis, laevis; lobulis lateralibus plerumque obtusis, emarginatis, 

 praeter lacinulam sinui proximam quae est paulum conico-pro- 

 ducta, in apice duabus spinis divergentibus armata. 



