240 NOTES ON JAPANESE DESMIDS. 
8. saponicum, new var. — Larger, processes longer, and more 
slender. Long. incl. proc. 58 »; lat. incl. proc. 50 ; lat. isth. 
244. Fig. 5. Junsai numa i re 
41. S. quadricornutum, n. sp. — Small, semicells cunea 
below, and rounded above; constriction, a rectangular opening 
ute spine; of the four only two are visible at once, the other 
two being placed vertically underneath them. Isthmus erste 
third part of the breadth of the semicell. Membrane smooth. 
Long. 25 ; lat. incl. proc. 80 p; lat. isth. 10 p. Fig. 4. 
Junsai numa. . : ‘ost 
This species resembles S. bifidum (Ehrb.) Breb. in end view, bu 
in front view it is entirely different, as it is from every other known ~ 
Species. 
VI. Xanrurprum Ehrb. 
1. X. fasciculatum Ehrb. Junsai numa. 
2. X. antilopeum (Breb.) Kiitz. Junsai numa. th 
3. X. leiodermum, n. sp. — Moderately large, about one-fi 
p 
longer than broad; semicells suboctagonal; constriction deep, acute, 
i i = +b ve i e lower angle, 
directed upwards not quite verti ally. No centra i 
Membrane smooth. Isthmus about one-third of the breadth of the 
semicell. Long. 48 »; lat. 89 »; isth. 11 fh. g. 11. 
Junsai numa. 
VII. Crosrerrum Nitzsch. 
1. C. striolatum Ehrb. Junsai numa. 
2. C. Lunula (Miiller) Nitzsch. Junsai numa. 
3. C. acerosum (Schrank) Ehrb. Yokohama. 
4. C. turgidum Ebrb. 
8. curtum, new var.—Smaller than the type, 6-7 times as long 
as broad. Long. 881 »; lat. 57 p. Junsai nu 
5. C. lineatum Ehrb. Yokohama. 
6. C. macilentum Breb. Yokohama. 
7. C. Ehrenbergii Me: _ Junsai numa. 
