224 ARTHUE DENDY. 



ance from the blunt^ rounded pseudopodia which characterise 

 a typical amoeboid cell. Nevertheless it is often very difficult 

 to say whether a particular cell should be classed as stellate or 

 araceboid, especially when that cell is of small size; and I am 

 inclined to tliink that no hard-and-fast line of distinction can 

 be drawn between the two. Thus figs. 39 — 42 represent a 

 number of cells from the dermal cortex of Leucandra 

 phillipensis^ which I personally should class as stellate, but it 

 would be very difficult to prove that they are not amoeboid. 

 Similarly fig. 55 represents four mesodermal cells from the 

 dermal cortex of Grantiopsis cylindrica, which may be 

 classified as stellate or amoeboid, according to the taste of the 

 observer. For my own part I am inclined to believe that even 

 the most typical stellate cells may be, to a greater or less extent, 

 amoeboid, and capable of a certain amount of movement. What 

 appears to be division of the '' stellate'' cells by fission is very 

 clearly seen in the cortex of Leucandra phillipensis, in 

 which many of the cells have two nuclei, and also show 

 signs of division in the form of the cell body (figs. 39, 

 40, 42). 



Glandular Cells. — These, as I have already pointed out 

 (9), are of two kinds, calcoblasts and subdermal gland-cells. I 

 can only confirm the account of these structures which I gave 

 in the case of Grantia labyrinthica. I have recently 

 observed some very beautiful examples of calcoblasts. They 

 appear to be most easily recognisable on the inner portions of 

 projecting dermal oxeote spicules. Figs. 44 — 47 represent 

 portions of such spicules from the dermal cortex of Leu- 

 candra phillipensis. Each spicule has a single nucleated 

 calcoblast attached to its inner half, and I do not hesitate to 

 regard these cells as the manufacturers of the material of 

 which the spicules are composed. At the same time it will 

 be sufficiently obvious, on comparing figs. 44 — 47 with figs. 

 39 — 42, that the calcoblasts are very similar in appearance to 

 the ordinary ''stellate^' cells, which are found embedded in the 

 gelatinous ground substance in their immediate neighbourhood. 

 In Grantiopsis cylindrica I have found vei'y large cal- 



