74 Mr. KiPPisT on the existence of Spiral Cells 



polygonal thick-walled cells of very small diameter, covering a loose spongy 

 mass of thinner and more transparent tissue. In A. coromandeliana the exter- 

 nal cells are very nearly hexagonal and prismatic, like those of a honeycomb. 

 The seeds of A. Kunthiana differ much from those of the three former species, 

 being much smaller and concentrically rugose, as in some species of Rostel- 

 laria and Rungia. 



Justicia EcboUum, J. rotundifolia, J. dentata. — In their large size, incrassated 

 border, and dense woody testa, the seeds of these three closely allied species 

 agree with those oi Asy stasia coromandeliana, but differ in their obliquely- 

 cordate or almost rhomboid form and nearly straight margin, and in being 

 furnished with numerous small radiating tubercles. The testa consists of 

 elongated hexagonal prisms, which, when viewed laterally, bear considerable 

 resemblance to barred or porous vessels. The species differ but little from 

 each other in the form of their seeds ; those of J. dentata appear to be rather 

 more acuminated, and the tubercles are more prominent than in those of 

 J. rotundifolia, which are somewhat rounder and blunter, with a thicker and 

 more strongly-marked border. 



Rostellaria procumbens, R. diffusa, R.guinguangularis, R.peploides, R.FahUi. 

 — The seeds of the above-named species oi Rostellaria present a great similarity 

 of structure, especially the four first, which are furnished with narrow, concen- 

 tric, slightly undulated ridges, formed of small, nearly regular, prismatic^ cells : 

 those of R. procumbens and R. diffusa have the external ridges nearly continu- 

 ous, while in R. quinquangularis and R. peploides they are more or less inter- 

 rupted, and occasionally anastomose : but in R. Vahlii their place is supplied 

 by a number of short oval prominences, constructed of similar tissue, which 

 are scattered over the seed. 



Eranthemum crenulatum, Rungia repens, Andrographis echioides. — These, 

 like the preceding, have their testa disposed in elevated ridges formed of thick- 

 walled hexagonal cells, concentric in the two former, reticulated and covered 

 with very minute projecting points or glands in the latter. Similar glan- 

 dular prominences occur on the seeds of Rostellaria quinquangularis and 

 peploides. 



Hypoestes fVallichii, H. purpurea. — The seeds of both species present nu- 

 merous short blunt tubercles, closely crowded together, and formed of thick- 



