246 DE. JULIUS SCHAAESCHMIDT ON AFGHANISTAN A.LQM. 



concentricas ordinatis munita. Long. 0056 millim., lat. 0'044 

 millim. 



31. Cosmaeium ptjlcheeeimum, Nordstedt, in Warming's 

 Symholas adfloram Brasilia, p. 175, t. iii. f. 24. Also in division. 

 Size 0-050 X 0040 millim. 



32. C. undulatijm, Gorda ; Wittrock, Anteckningar om Skan- 

 dinaviens Desmidiaceer, p. 11 , f. 3. 



Var. nov. oenatttm, (Plate V. fig. 23.) Membrana tota puuctis 

 distinctis in series radiantes ordinatis munita. Long. 0020 

 millim., lat. 0013 millim. 



33. C. Aitchisonii, n. sp. (Plate V. fig. 20.) Cosmariurn 

 parvum, subhexagonum, tertia parte longius quam latius, pro- 

 fundissime constrictum, sinu lineari ; semicellulee subtrapezicse, 

 sursum angustatse, dorso subrotundatse, lateribus subconvexis, 

 angustis inferioribus truncato-rotundatis, sub dorso tumore in- 

 structs. Membrana achroa, glabra. Long. 0032 millim., lat. 

 0024 millim. 



Differt a G. nitidulo, De Notaris (Nordstedt, Desm. Ital. t. xii. 

 f. 10) seinieellulis late rotundato-trapezoideis, angulis inferiori- 

 bus valde rotundatis, dorso tumore magno instructis. 



34. C. Hookebi, n. sp. (Plate V. fig. 21.) Gosmarium par- 

 vum, paullo longius quam latius, medio profundissime constrictum, 

 sinu lineari, semicellulae reniformes, a vertice visa3 oblongo- 

 ellipticae, dorso 2-3 verrucis acute conicis munitae. Membrana 

 achroa, glabra. 



Differt a G. Fhaseolo, Brebisson (Ealfs's ' British Desmidiaceae,' 

 p. 10G, t. xxxviii. f. 5), membrana glabra, semicellulis vertice 

 oblongo-ellipticis, medio non tumidis, dorso verrucis conicis 2-3 

 munitis. 



35. C. Oliveei, n. sp. (Plate V. fig. 22.) Gosmarium par- 

 vum, tertia parte longius quam latius, ellipticum, medio profunde 

 constrictum, sinu lineari angustissime ; semicellulae a basi recta 

 magis magisque angustatse, apice valde rotundatae, lateribus leviter 

 convexis, angulis inferioribus subrectis, a vertice visas oblougo- 

 ellipticae, medio inflatse, breviter cuspidatae. Nuclei amylacei 

 singuli. Membrana achroa, glabra. Long. 0*040 millim., lat. 

 0031 millim. 



Differt a O. microsphincto, Nordstedt (Desm. Ital. p. 33, t. xii. 



