THE FKESirWATEK ALGJE OF MADAGASCAR. 86 



Order SCYTOJ^EMACE.E. 

 Genus Toltpothrix, Kiitz. 



176. Toltpothrix tenuis, Kiitz. Phycolog. general, p. 228 ; Tabulce Pbycolog. ii. p. 9, 

 tab. 31. fig. 11. {Tolypothrix 2:)ygincea, Kiitz.) 



No. 3. 



Order SIROSIPHONIACEiE. 

 Genus Hapalosiphon, Nag. 



177. Hapalosiphon Baeonii, nov. sp. (PL V. figs. 21-24.) B. thallo ca^spitoso, 

 aquatico, circiter 1 mm. lato ; fills primariis dense intricatis, ramosis (interdum dense 

 ramosis), ramis unllateralibus, e cellulis singulis passim binis rotundo-quadratis 

 vel subglobosis, vagina ampla, hyalina et acbroa, formatis ; fills secundariis 

 brevibus, numerosis, passim adpressis, c cellulis singulis ut in ramulis primariis 

 formatis ; beterocystis subquadratis intercalaribus. 



Crass, fil. 75-10 fx ; diam. cell. 38-5 ^. 



No. 3. 



This species is nearest to jff. j9/fm^7M5, Kirchn. (Alg. Scbles, p. 2ZV)\_=.IIapalosip1wn 

 Braunii, Nag. in Kiitz. Species Algar. p. 313], but differs in its much smaller size, in the 

 primary filaments and the branches being of equal thickness, as well as in its shorter 

 subglobose cells. 



Order OSCILLAEIACE.E *. 



Genus Spirulina, Turp. 



178. Spirulina major, Kiitz. Phycolog. general, p. 183; Gomont, Monographic des 

 Oscillari^es, p. 271, pi. vii. fig. 29. {S. oscillarioides, Kutz. Tabula3 Phycolog. i. 

 p. 26, tab. 37, fig. 8.) 



Crass, fil. 1*5 u ; anfractibus inter se 8*5 fx distantibus. 

 No. 3. 



Order CHROOCOCCACE^. 

 Genus Merismopedia, Meyen. 



179. Merismopedia violacea, Kiitz. Species Algar. p. 472. 

 No. 3. 



Genus Tetrapedia, Reinsch. 



180. Teirapedia morsa, nov. sp. (PL V. fig. 3.) T. minutissima, circiter tarn 

 longa quam lata, modice constricta, sinu semieliiptico ; semicelhiUc subrect- 



* " Gomont has shown that the priority of name belongs to Oscillatoria, Vauch., rather cnan to OsciliarLt, Bosc, 

 and the correct name of the order is therefore Oscillatoriacoje."— A. W. BEKXErr, in hit. 



