THE FEESHWATER ALGJi 01' MADAGASCAK. 05 



granulatae, in medio utrobique papilh\ iiistructa? ; a latere vis^ 8ubrotimda>, papilla 

 mediana utrobique instructse ; pyrenoidibus singulis. 

 Long. ll-5-12-5^^; lat. max. semicell. 12-5-13-5^.; lat. ad apic. 7-7-S-5,,; lat. isthm. 

 5"5-6*5/i ; crass. 9ju. 

 No. 3. 



98. CosMAEiUM ABRUPTTJM, Lund. Desm. Suec. p. 43, tab. ii. fig. 22. 



Var. GEANULATUM, noY. var. (PL VII. fig. 32.) Var. ccllulis granulis parvis in ambitu 

 toto et intra marginem ornatis. 

 Long. 14-15 IX ; lat. 13'5-14-5 fi ; lat. isthm. 4 ^ ; crass. 8-5 ^. 

 Nos. 0, 1, 3, and 18. 



99. CosMARiuM HAABOLiENSE, Wille, Bidrag til Kundsk. cm Norges Perskv. Alg. p. 25, 



tab. i. fig. 6. 



Var. PEOTRACTUM, nov. var. (PI. VII. fig. 13.) Var. semicellulis truncato-pyramidatis, 

 angulis inferioribus rotundatis, sub apicibus leviter retusis, apicibus late truncatis. 

 Long. 23 fx ; lat. 22 /u ; lat. apic. 14 fx ; lat. isthm. 8 ^ ; crass. 13 /t. 

 No. 0. 



100. CosMARiUM DiCHONDRUM, nov. sp. (PI. VII. fig. 12.) C, parvum, paullo longius 

 quam latum, profunde constrictum, sinu lineari extreme subampliato; semicellulse 

 ellipticse minute et irregulariter granulatse, granulis inagnis binis in medio intra 

 apicem ; a vertice visse ellipticse, utrobique granulis magnis binis instructis; a 

 latere visa^ circulares, granulo magno utro])ique ad apicem. 

 Long. 21 ;u; lat. 19 /u; lat. isthm. 6/u; crass. 11*5/*. 

 No. 18. 



Compare with C. haaholiense, Wille [l. c), and C. trigemmatum, Delp. (Desm. Subalp. 

 p. 109, tab. 7. figs. 59-61). 



101. CosMARiUM TRIPAPILLATUM, nov. sp. (PI. VII. fig. 24.) C. minutum, tarn longum 

 quam latum, modice constrictum, sinu sublineari ; semicellulae elliptico-oblonga?, 

 apicibus late truncat^e, membrana minute granulata, granulis circiter 5 latere uno. 

 quoque, apicibus indistiucte granulatis, intra apicem unumquemque serie horizontali 

 granulorum trium majorum; a vertice visae elliptical, in medio utrobique granulis 

 tribus pra^dit^; a latere visae subglobosa), granulo singulo in parte superiore 

 lateris uniuscuj usque instructae. 



Long.=rlat.=15-4-17-3/«; lat. isthm. 6'5- 7*5 ^u; crass. 9-10-5^. 



No. 3. 



Compare with C. polymorphum, Nordst. (Pesm. Brasil. tab. iii. fig. 31). 



SECOND SERIES. — BOTAXY, VOL. V. ^ 



