16 TUFTS COLLEGE STUDIES, VOL. IV, No. 7 



The replication is unique in character ; occupying only 180 

 on each side of a dissepiment, alternating on the two sides. 



52. S. RKCTANGULARIS Transeau, 1914, p. 291, PI. XXV, 

 figs. 9-1 1. Filaments usually scattered ; cells 35-40 X 150-320/1, 

 dissepiments replicate ; chromatophores 2-4, making 2-5 turns ; 

 fertile cells quadrately inflated towards the middle, up to 70 /t 

 diam ; spores ovoid to cyliudric-ovoid with rounded ends, 

 45-65 X 75-120/1, yellowish brown, membrane smooth. 111. 



53. S. FARLOWII Transeau, 1915, p. 29; P. B.-A., No. 362. 

 Cells 24-30 X 70-180/1; dissepiments replicate; one, rarely two 

 chromatophores, making 2.5-6 turns ; fertile cells inflated to 

 39-60 /i ; spores ellipsoid, ends more or less pointed, 32-45 X 

 48-93 /i, yellow, smooth. Mass. 



Apparently much of the material that has passed in New 

 England for S. Grtvilltana, comes nearer to this species, of 

 which the ellipsoid spores with pointed ends constitute the most 

 distinctive character. 



54. S. ILLINOISBNSIS Transeau, 1914, p. 296, PI. XXVIII, 

 1 '3- Forming dull green tangled masses; cells 65-85 X 



100-300/4; dissepiments plane; chromatophores 6-9, narrow, 

 nearly straight and longitudinal, or spiral and making .1-1 

 turn ; conjugating cells shortened and somewhat inflated and 

 geniculate ; tube short and broad ; male cells shorter than 

 female; spores 85-115 X 140-190 /i, ovoid to ellipsoid, yellow, 

 membrane thick and punctate. 111. 



55. S. FLORIDANA Transeau, 1915, p. 30. Cells 56-66 X 

 '20-335 /i; dissepiments plane; chromatophores 4-5, nearly 

 straight or making a half turn ; conjugating cells geniculate, 

 shortened; fertile cells inflated, up to 135^; tube very short 

 and broad ; spores ellipsoid, 75-105 X 95-135 /*, yellow, smooth. 

 Fla. 



56. S. MICROPUNCTATA Transeau, 1915, p. 27. Cells 30- 36 X 

 120-300/1; dissepiments plane; one chromatophore, making 

 3-7 turns ; fertile cells scattered in twos or fours among vegeta- 

 tive cells, or continuous, inflated on the tube side, outer side 

 straight ; tubes formed almost wholly by the male cell ; spores 

 ellipsoid, 37-42 X 57-70 /i, yellow, membrane minutely punctate. 

 N. H., III. 



57. S. RKPLRXA Transeau, 1915, p. 28. Cells 30-40 X 

 120- 300/1; dissepiments plane; chromatophore single, making 

 3-8 turns ; fertile cells in groups of 2 or 4, inflated or strongly 

 reflexed ; tube formed by male cell ; spores ellipsoid, 44-54 X 

 90-150 /i, yellow-brown, smooth- 111. 



