Navlculacea.} infusohial animalcules. 467 



Var. faj aqiiaticum. — Ratlicr turgid ; frustules sub -flabolliform, 

 stipes short, sometimes obsolete. Length 1 -720th. 



Var. fhj salinum. — Slender, stipes elongate. Length 1 -720th. 

 It = G. minutissimum (Ekr. 1838.) 



Var. fcj man'num. — Larger ; stipes rather thicker, subramose. 

 Length 1 -600th. In fresh and salt water. 



GojiPHONEMA subramosum. — Cimeate, acute at the base, (juite 

 smooth ; on secondaiy side obovate ; stipes very slender, and subramose. 

 Length 1-1 140th. Common on fresh- water Algae. According to 

 Kiitzing = G. discolor and G. clavatum (Ehr.) 



G. lagcnula. — Slender, linear-cuneate, finely striated ; on secondary 

 side more acute, and tapering at the base ; the apex having a pro- 

 minent ridge, and being sub-capitate ; stipes short. Length 1- 720th. 

 In fresh water, Trinidad. 



G. affine = G. gracile (Ehi\) — Rather turgid, elongate, striated ; 

 margins on primary side rather curved ; on secondary side, sub- 

 lanceolate, end obtuse; stalli short, subramose. Length 1 -360th 

 Trinidad. 



G. constrictum. — Rather turgid, striated ; on secondary side 

 tapering at the base, ventricose in the middle, with a short con- 

 stricted neck, surrounded by a truncate, broadly rounded head ; stipes 

 ultimately elongated and ramose. It, says Kiitzing, = G. truncatum 

 and G. par adoxum (Ehr.), also G. pshlucforme,'Ral£s. (P. 16, f. 23.) 



G. (?) contradum. — Miuutc, attenuate at the base, constricted in 

 the middle, with a dilated rounded apex; stipes simple, short, or 

 obsolete. Length 1 -1440th. On Zygnema. Germany. 



G. mtricatum. — Slender, forming a compact mucous, stratum ; 

 frustules, on secondaiy side, tumid at the centre, much produced at 

 each end, narrow, obtuse ; stipes rather rigid, but mucous, and 

 extremely interwoven ; its division dichotomous. Length 1 -420th. 

 Nordhausen. 



G. lanceolatum.— Striated, linear-cuneate, very gradually tapering 

 at each end ; secondary side lanceolate, with acute ends. 



In a note, Kiitzing observes, that Ehrenberg has described several 

 species omitted by himself — as G. Cygnus, Vibrio, Turris, Glans, 

 nasutum, coronatum, laticeps, Angliciim, subtile, and A?neric(mum, which 



