186 Trans. Acad. Sci. of St. Louis. 



grains are rather small. The outer or epidermal layer only, 

 contains protein. 



Lathyrus maritimus, Bigelow. 



PL XVI. f. 3. 



Testa 200-215 fi thick, as in i. venosus. Malpighian cells 

 61-70 ^ long and pigmented ; cell-cavity large at the base 

 with a more regular outline and less conspicuous lateral pore- 

 canals. Several chromatophores occur in Malpighian cell. 

 The pigmented osteosclerids are thick-walled, 40-60 fi long, 

 marked with longitudinal striae. Nutrient layer diflferentiated 

 into two parts. Lower part contains more pigment than the 

 upper. Endosperm as in last species. Cells of the embryo 

 contain some pigment and protein grains. Starch grains 

 abundant, 33X14 /i-42X28/A. 



The Malpighian cells of Lathyrus latifoUuSfJj., L. odoratus, 

 L., X. sylvestris, L., and L. salivus^ L. are irregular on the 

 surface. The light line occurs in the upper third of the 

 cell. In all of these species the cell-cavities contain protein 

 and chromatophores. The Malpighian cells of L. odoratus 

 are 110-125 />t long. The testa is 185-200/^ thick. The 

 testa of L. latifolius is 95 -100 /^ thick and the Malpighian 

 cells are 40-45 /x long. In L. sylvestris the testa is 180- 

 185 IX thick and the Malpighian cells are 67-80 ft long. The 

 osteosclerids in all of these species are I-shaped, with promi- 

 nent longitudinal canals. In L. latifolius these are 26-30 /-t 

 long; in L. odoratus about the same; in L. sylvestris 22- 

 50 fi long. The nutrient layer in these species does not dif- 

 fer essentially from that of L. maritimus. Endosperm is but 

 sparingly developed. In L. sativus the aleurone cells are 

 elongated and narrow. Starch grains in the cells of the 

 embryo are spherical or elliptical, variable. The starch 

 grains are large in L, odoratus. Compound grains occur 

 occasionally in L. sativus. Cell walls are provided with pore- 

 canals. 



The starch grains of the different species vary in size 

 as follows: L. latifolius 14X19.6-16.8X22-7.4X19.6 /x. 

 L. odoratus 16.8X28-11.2X31-16.8X36 /x. L. sylvestris 

 14X26.8-16.8X22.4-8X25. Palisade cells are wanting in 

 all of the species. 



