288 MESSRS. W. WEST AND G. 8. WEST ON 
more produced lateral and polar lobes than the European plant; 
the specimens seen by Johnson show this and so do those 
contained in material received from him. (Cfr. also West & 
G. S. West in Trans. Linn. Soc. Ser. II. (Bot.) v. p. 242, pl. 14. 
ff. 18, 19.) 
Long. 68 u; lat. 42 u; lat. isthm. 8 u; crass. 22 p. 
Hab. De Land, Florida (H. J. no. 587). 
Var. VALIDUM, n. var. (Pl. 16. fig. 8.) 
Var. robustum, lobis lateralibus et polaribus latioribus, angulo 
loborum lateralium sursum curvato. 
Long. 70 u; lat. 40 p; lat. isthm. 8 u; crass. 24 p. 
Hab. De Land, Florida (H. J. no. 584). 
Var. puruM, nob. (E. purum, Wolle, Freshw. Alg. U. 8. 
P. 37, pl. 58. ff. 9-11.) 
Var. angulis loborum lateralium polariumque late rotundatis, 
sinu minus aperto. 
Hab. Florida and New Jersey. 
44. EvasrRUM Jonnsonir, n. sp. (Pl. 16. fig. 9.) 
E. submediocre, 14-plo longius quam latum, profunde con- 
strictum, sinu angusto lineari; semicellule subtriangulares, 
angulis basalibus late rotundatis, lateribus inferioribus binodu- 
losis, lateribus superioribus concavis, apicibus late convexo- 
truncatis, annulo granulorum prope et circa apicem, tumoribus 
granulatis tribus in centro, eo mediano et inferiori cum annuo 
granulorum 5, iis superioribus et latera versus granulis 4 
instructis, cum granulis circ. 4 intra angulos basales; a latere 
vise ovate; a vertice vise elliptic, tumoribus prominentibus 
utrobique, et in centro (cirea apicem semicellule) cum annulo 
granulorum 16. 
Long. 60 y; lat. 40 p; lat. apic. 17 p; lat. isthm. 11 p; crass. 
26 p. 
Hab. New Connecticut (H. J. no. 523). 
45. E. arrexvatum, Wolle, Desm. U. S. p. 108, pl. 26. f. I7; 
West & G. S. West, in Trans. Linn. Soc. Ser. II. (Bot-) Y- P- A 
pl. 14. ff. 20, 21.—E. Hastingsii, Wolle, Desm. U. S, new edi 
p. 113, pl. 42. ff. 16, 17. 
Long. 64 1; lat. 35 p; lat. apic. 15 p; lat. isthm. 11 p; crass 
23 p. 
Hab. Seattle, Wash. (H. J. no. 638). 
