302 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 
become papillate (pi. 19, fig. 105), and thus in a manner, and to 
a slight degree, imitate the piliferous short cells of the epidermis of 
many plants. 
Hyacinthus cimethystinus. — The divisions giving rise to the 
transfusion cells were found to be oblique (pi. 19, fig. 106, T). The 
appearance of the cells in surface view is shown in figure 107 
(plate 19) where it is clearly a proximal segment. In figure 108 
(plate 19) a young transfusion cell is seen which has lately divided 
transversely, as trichoblasts divide in many instances (Juncus, Scir- 
pus). 
Pancratium ovatum. — The initiatory division is oblique. The 
proximal segment becomes the transfusion cell. 
Aspidistra lurida. — In the material studied a dermatogen distinct 
from the root-cap and from the initials of the cortex, was found at 
the punctum veyetationis. In a certain section this dermatogen 
was observed, 7 cells from the apex, to split by periclinal walls into 
2 layers, the outer of which became further divided to form a 
mantle of from 2 to 4 layers of short cells, while the inner became 
the hypodermal layer. In the hypodermal cell standing the 21st 
from the apex, an oblique transverse division wall had cut off a 
narrow proximal segment,— the rudiment of a transfusion cell (pi. 
19, fig. 109, T). In the 22d cell the same thing had happened. 
In the 23d no division had taken place. In the 24th the transverse 
wall was nearly or quite perpendicular to the outer surface. In the 
fully developed exoderm the transfusion cells are short and rounded 
and project above the general surface of the layer (pi. 19, fig. 110). 
They are usually somewhat wedge-shaped in longisection. Figure 
111 (plate 19) shows them in face view. 
Anthericum Pernarnii. — The appearance of the alternating long 
and short cells is shown in figure 112 (plate 19). 
Monstera deliciosa. — The short cells arise as proximal segments 
in divisions of hypodermal cells near the growing point. 
Anthurium Sellerzerianum. —The transfusion cells (pi. 19, figs. 
113, 114) project above their companions. They are lenticular in 
tangential section, and are closely invested laterally by the more 
elongated cells. They are characterized by relatively abundant pro¬ 
toplasm. 
Arundina bambusae folia. — I have ascertained the origin of the 
transfusion cells. They arise as short proximal segments of the 
mother cells, and in a particular instance were noted at a distance of 
