THE FEESHWATEE ALG.^ OF MADAGASCAE. 5^ 



Var. SUBKOTUNDATUM, nov. var. (PI. VIII. fig. 11.) Var. paullo longior quam forma 

 typica, lateribus leviter convexis et apicibus rectis vol levissime concavis. 

 Long. 8-9 ft ; lat. 67-7 fx ; lat. isthm. 2-2-5 ^ ; crass. 4*5 ^l. 

 No. 1. 



75. CosMARiTJM Meneghinii, Breb. in Ralfs, Brit. Desmid. p. 90, tab. xv. fig. 0. 

 Long. 16-20 ^ ; lat. 12-5-14-5 ^u; lat. isthm. 25 ^tt ; crass. 7-75 /u. (PI. VI. fig. 41.) 

 Nos. 1 and 10. 



These forms agree with C. Braunii, Eeinsch, v. Meneghinii, Rcinsch (Algcnfl. 

 mittl. Theil. von Prank, p. 115, taf . x. fig. iii. d). 



76. CosMARiUM CONCINNUM, Beinsch, Algenfl. mittl. Theil. von Prank, p. 110, taf. ix. 

 fig. iii. (C Me7ieghinii, Breb., var. concinnum, Rabenh. PI. Europ. Alg. iii. ]). 163.) 



Long. 12-5-13'5;ti; lat. 9'5-10/u; lat. isthm. 2fi; crass. 5-3-6^*. (PL IX. fig, 23.) 

 Nos. and 1. 



77. CosMAEirM L^VE, Babcnh. PI. Europ. Alg. iii. p. 161 ; Nordst. in AVittr. ot Xordst. 



Desm. et jEdog. in Ital. et Tyrol. ]). 29, t. xii. fig. 4. Porma membrana glabril. 



(Cfr. Bacib. Desmid. w pod. naokol. ziem. p. 4, t. vi. figs. 19, 20.) 

 Long. 16 ju; lat. 12-5 ,u; lat. isthm. 2;u; crass. 65 jit. 

 No. 3. 



78. CosMARirM PLANUM, nov. sp. (PI. VIII. fig. 9.) 6'. parvuni, ptcne duplo longius quam 

 latum, profunde constrictum, sinu subaperto et acuto ; semicelluhc truncato-pyrami- 

 datae, angulis inferioribus valde rotundatis, angulis superioribus rotundatis, apicibus 

 subretusis ; a vertice et a latere visas ellipticse ; membrana glabra ; pyrenoidibus 

 singulis. 



Long. 29-35 ^i ; lat. 17-18 ^u ; lat. isthm. 5-8-7 /u ; crass. 11-5 ^i. 

 No. 0. 



This species may be compared with some forms of C. Meneghinii, Breb., and C Icevey 

 Babenli. 



79. CosMARiUM Begnesii, Beinsch, Algenfl. mittl. Theil. von Prank, p. 112, taf. viL 

 fig. viii. 



Var. TRITTJM, West, Presliw. Alg. of W. Ireland, p. 119, pi. xxi. fig. 3. 

 Long. 8-5 n ; lat. 8*5 ;u ; lat. isthm. 5 /u ; crass. 4 /u. (PI. IX. fig. 24.) 

 No. 3. 



80. CosMARiUM PsEUDOREGNESii, nov. sp. (PI. VI. figs. 42, 43.) C. minutum, pauUo 

 longius quam latum, profunde constrictum, sinu excavato et semielliptico ; 

 semiceUul^ subrectangulares, angulis inferioribus acutis, angulis superioribus 

 emarginatis, lateribus retusis, apicibus biundulatis (retusis in medio), in centra 



i2 



