116 FRESHWATER ALGJE OF THE UNITED STATES. 



Diam.—Q.OOOS". (0.0li09"-0.0016." R.) 



Sijn.—C. rostralum, Ehrenberg. Rabenhorst, Flora Europ. Algarum, Sect. III. p. 135. 



Hab. In fossis, prope Philadelphia ; Wood. 



Bodv lanceolate-fusiform, at each end greatly and for a long distance attenuated, slightly curved, 

 striate; crura setaceous and scarcely as long as the body and sometimes much shorter; eytio- 

 derm li"-htor luteolous, densely striate, vesicles uniscriate, 5-6 in each crus ; vacuoles oblong, 

 often indistinct, containing from 12-15 actively moving granules. 



Remark. Fig. 3, pi. 12, is a drawing of this species, magnified 260 diameters. 



C. setaceiini, Eiirb. 



C. corpore anguste lanceolato, recto vel subrecto, distincte striato, utrinque in rostrum setaceum, 

 levissime incurvum, obtusura, longissirae porrecto; singulo rostro corpore 3-4 plo longiore; 

 et vesiculis et locello indistinctis. (R.) 



Diam.—M&x. (plerumque) 0.0004"— 0.00044." (R.) 



Sijn. — C. setaceum, Ehrenberg, Flora Europ. Algarum, Sect. III. p. 136. 



Eab. — Stonington. (Lewis) Pennsylvania; Wood. Georgia; Florida; Providence, Rhode 

 Island ; Bailey. 



Frond very slender, from twenty to twenty-five times as long as broad, narrow-lanceolate; 

 upper ai\d loiuer margins nearly equally and but slightly convex; each e.xtreraity tapering 

 into a very long and slender setaceous colorless beak, longer than the body, ultimately curved 

 downwards, ends obtuse; e. f. colorless, striw close, faint, central suture solitary. Sporangium 

 cruciform. L. txs "• ^ 53st "• Archer. Pritchard's Infusoria. 



CAmblyonema, Ehrb. 



C. filiforme, cylindricum, laeve, utroque fine parum attenuatum, apice rotundum. (R.) 



Syn. — C. lineatum, Ehrb. Bailey, American Journal of Science and Arts, 1841, p. 303. 



G. Amblyonema, Ehrb. Verbreit. p. 123. Rabenhorst, Flora Europ. Algarum, Sect. 

 III. p. 138. 



ffab. — West Point, New York ; Providence, Rhode Island, Bailey. 



Filiform, cylindrical, smooth, gradually attenuated at each end ; the apex rounded. 



Remarks. — I have never recognized a specimen of this species, nor have I had 

 access to the original description of Ehrenberg. 



Genus TETMEMORUS. 



Cellulae cylindricse vel fusiformes, rectoe, medio distincte constrictae, utroque polo anguste incisse 

 cytioderma sat firmum, plerumque granulatura vel punctatura. 



Cells cylindrical or fusiform, straight, distinctly constricted in the middle, narrowly incised at 

 each end. Cytioderm firm, mostly punctate or granulate. 



T. Brebissonii., (Mengh.) Ralfs. 



T. diametro 4-6 plo longior ; a fronte cylindricus, utroque polo non attenuatus sed rotundato- 

 truncatus ; a latere fusiformis et a medio in apices rotundatos sensim attenuatus; cytiodermate 



striato-punctato. 



Diam.— 7|§/' = .0016". 



Syn.— T. Bribissonii, Menoheini, Rabenhorst, Flora Europ. Algarum, Sect. III. p. 139. 



