FRBSH-W A TK K A !,<;.!: Of fHl I'MTKD STATUS. 123 



/.'- ;/<i/7.-x. The only specimens that I have seen of this species were found in a 

 spring in the Philadelphia Cit\ Park, near Colmnbiii bridge. 

 Fig. 11, pi. 1'2, was drawn from one of these specimens. 



(u nns Sl'ILl-KO/OS.MA, CoBDA. 



('(Hulas coniproMi-, meilio transvi-rsitn profundc incisse, itnquc bilobattc, in quoque lobo massa 

 clili)r(>|ihyllosa quadriradiata iiiicleuni amylaoeum inTolvente pried i to;, in filum planum Ueniiformem 

 i.-tlimis i-oiijuiirtii'. Xvgosporas globosse ?el ovales, glabra. (II.) 



n. Jat/i iHoxira, Krz. 



Odontellx, ;<., KHRB. 

 Ifthmitf, Kj)ec., MKNKO. 

 Spondylogium, Hufcu. 



Cells compressed, transversely very deeply incised in the centre and therefore bilobate, furnished 

 in each lube with a quadriradiatc mass of chlorophyl surrounding a starch grain, conjoined laterally 

 l.v istlniiuses in a tteuiform fascia. 



1,'nnarfa. I have never found any species of this genus in America. Professor 

 Bailey lias, however, detected the following: 



Kpli. r\< avalniii, RALFS. 



Sph. plcniinqne nudura (sine tubo mucoso) sph. vertebratnm multo minns ; cellulis diametro 

 duplo-longioribus, medio excavato-constrictis, a latere ellipticis utroque polo rotundatis; lobis 

 bn-vibus truncato-rotundatis, laevibus vel granulato-dcnticulatis ; isthmis biuis parvis rerru- 

 ciforniibua ; zygosporis pleruraque ovatis. (R ) 



Lalil. filor. 0.00047" 00032". (R.) 



Syn. Sph. excavatum, RALFS, British Dcsmids, p. 67. 



Hab. Florida; Georgia; South Carolina; Rhode Island ; Bailey. 



"Joints longer than broad, having a deep sinns on both sides and two sessile glands at each 

 margin at their junction, veryminnte, seldom more than twenty-five joints in the filament, 

 \\liich is fragile, and finally separates into single joints ; at their junction, in the front view 

 are two minute glands or processes, situated one near each angle, and nearly invisible before 

 tli<> escape of the endochrome. The joints are nearly twice as long as broad and much con- 

 stricted in the middle ; the constriction is like an excavation or broad sinus on each Bide, so 

 that the margins of the filaments appear sinuated. The endochrome is pule bluish-green 

 with minute scattered granules. The transverse view is oblong with four sessile glands, two 

 on each side and situated near the ends." Ralfs' Brit. Desm., p 67. 



Sph. pulchriim, BAILKT. 



Sph. cellulis oblongo-quadrangnlaribas, diametro dnplo-brevioribns, acute incisis, arete con- 

 nexis; lobis oblongis rectis, apice rotundatis; isthmis nullis, vagina mucosa ampla dis- 

 ncta. (R.) 



Syn. S. pulchrum, BAILEY. RALTS, British Desmid., p. 209 (Cum icone). 

 Sab. West Point, New York ; Princeton, New Jersey ; BAILEY. 



" Joints twice as broad as long, deeply incised on each side ; junction margins straight, con- 

 nected by short bands." 



Remark. " Prof. Bailey informs me that this species is twice as large as Sph. 

 i-t >/- Iratum" RALFS. 



