NOTES ON JAPANESE DESMIDS. 239 
emarginate spine, with two very small teeth; slightly below the 
ute of each side ; from these = round the end, end, the rs 
in s on 
argin 
two just within it. Membrane smooth. Isthmus half the breadth 
of the semicells. ears and lat. 82 »; lat. of isth. 14 pw. Fig. 7. 
unsai nu 
It seems unnece essary to compare this remarkable species with 
wad sever. though it is perhaps most nearly allied to S. monticulosum 
26. S. spinosum Ralfs. Junsai numa 
27. S. margaritaceum (uit ) Menegh. 
8. hirtum Nordst. Junsai numa. 
28. S. polymorphum Breb. Junsai n 
29. S. crenulatum Nag. Junsai numa a Yokohama. 
80. S. aculeatum (Ehrb.) M enegh. Junsai numa. 
31. S. vestitum Ralfs. nsai 
82. 9. gracile Ralfs. Junsai numa. 
33. S. doxum Meye Junsai numa 
34. S. tetracerum (Kiitz.) Ralfs. Junsai numa. 
35. S. Arachne Ralfs. Junsai numa. 
36. S. leptocladum Nordst. 
B. cornutum e. Junsai numa. 
37. S es aed Breb. “ unsai numa. 
38. S. subarmige .sp.—Small, considerably constricted, 
ee almost rectanglat ends ogpiaa semicells wi 
th. 
xcl. proc. Bo lat. excl. proc. 23 w; lat. of isth. 12 p 
Junsai n 
The nearest ally of this species is S. armigerum Breb. ; but it is 
not much more than half the size of that species, and is, besides, 
eiptgd smooth. ees 
39. S. sai — unde 
B. ux ne ‘: pt : a Be rocesses shorter, lower turned a 
little Teawaria. =e sess at right angles to the lower, 
d-angled ; ends smooth, witho ut granules. Junsai numa. Differs 
Sng Nordstedt’s MS. var . 
40. S. Hantzchii - (S. intricatum Delponte). Junsai 
numa 
