28 TUFTS COLLEGE STUDIKS, VOL. IV, No. 7 



5. Without basal enlargement of stipe. 7. C. ambiguum. 



5. With basal enlargement of stipe. 6. 



6. Basal enlargement capitate. 9. C. acumitiatutn. 



6. Basal enlargement a disk. 12. 



7. Without basal enlargement of stipe. 8. 



7. With basal enlargement of stipe. 10. 



8. Stipe long. 9. 



8. Stipe short and stout. 2. C. Sieboldii. 



9. Cell pyriform, up to 8 M long, stipe 10-16 M. 13. C. stipitatum. 



9. Cells up to 20 M long, stipe 8 /*. 5. C. heteromorphum. 



10. Broadly ellipsoid. 6. C. obtusutn. 



10. Narrowly lanceolate to linear. 4. C. strict tun. 



II. Regularly elongate-fusiform. 14. C. liintiftuutn. 



ii. Cylindrical with tapering ends. 12. C. gradlipes. 



12. Cell erect or somewhat oblique ; stipe shot t. 



n. C. Pringskfimii. 



12. Cell more or less distinctly falcate ; stipe longer. 



15. C. rostratum. 



Page 150, Note C. Natgelii and C. cylindricum have been 

 transferred to Characiopsis, p. 4. 



C. DEBAR YANUM should not read (Reinsch) nov. comb., but 

 C. DEBARYANUM (Reinsch) De Toni, 1889, p. 628. 



Page 151, after description of C. GRACIUPBS, add, 



13. C. STIPITATUM (Bachmann) Wille, 1909, p. 45 ; Brunn- 

 thaler in Pascher, 1915, p. 81, fig. 26; G. M. Smith, 1916, 

 p. 472, PI. XXIV, figs. 4-6; Chlamydomonas stipitata Bach- 

 niann, 1908, p. 81, figs. 1-15. Cells globose to ovoid, .5-8 /* 

 diam., with very slender stipe, 10-16 ft long. In the gelatinous 

 coating of Coclosphaerium. Wis., G. M. Smith. /-.w/vyV. 



14. C. UMNHTICUM Lemmermann, 1903, p. 81, PI. Ill 

 figs. 7-10. On the crustacean Diaphanosotna. Cells 25-80 X 

 5-14 M, fusiform, mostly curved, rarely straight, prolonged into a 

 stipe 6-10 M long, without basal disk. Apex ending in a long, 

 bristle-shaped beak ; chromatophores 4-8, band-shape, parietal, 

 with i pyrenoid; Wis., G. M. Smith. Sweden. 



15. CHARACIUM ROSTRATUM Reinhard fide Printz, 1913, 

 p. 41, PI. II, fig. 32 ; 19153, p. 17, PI. I, figs. 36-39. Cell from 

 lanceolate with curved apex to strongly falcate ; length without 

 stipe, 23-28 M. width 5-7 p. ; stipe 5-9 ft long, with distinct basal 

 disk. Twin Lakes, Mich., Transeau. Europe, Asia. 



The orginal publication by Reinhard being inaccessible, the 

 determination is from Printz. 



Brunthaler in Pascher, 1915, p. 83, resuscitates C. subsessile 



