EXPLANATION OF PLATE 87 
Fic, 30. Optical section of a mature megazooid of average size. [Baltimore. ] 
IG. 3 ooids produced in a megazooid keptin the dark two days. qud ] 
Fic. 32. Megazooids devoid of haematochrom, from a colony two weeks old. [Balti- 
more. 
Fic. 33. Production of a secondary generation where the haematochrom has all gone 
into one begin uncommon. [ Burlington. ] 
Fic. 34. So small a slit is ma at the zooid is compressed in squeezing out, but 
Fic. 35. It soon resumes the Bm 2 
Fic. 36. A zooid developed in darkness three days. [ Burlington. ] 
Fic, 37. A late generation in which the lifeless cilia of the mother-cell remain pura: 
division. [ Baltim 
Fic. 38. The e mh aii active, are attached to one of the daughter-zooids, both 
of whi e independently. [ Baltimore. ] 
Fic. 39. A Meri | clin ted at each end. [New York.] 
Fic. " A pair of megazooids incompletely separated. [Burlington. ] 
Fic. 41. A similar sonst with three heads — [Burlington.] 
E. 42-44. Fusion of a pair of incompletely formed megazooids. ease 
Fic. 45. A cell sd resting Miis in | open air. [Feb. 1, New k.] 
Fic. 46. The same cell com ig d .the next morning. 9:00 a. m. 
Fic. 47. eA of Venen 9: IO 
FiG. 48. er stage. hoe No Satin growth except the formation of cell- 
ri was visible when the magazooids 1.30. 
Fic, 49. Eight daughter- pe p the first generation ; sisi from becoming motile 
apparently by cold.  [ Burlington. ] 
Fic. 50. An sana large Sic ose (48 u long) with a solid chromatophore. 
[New 
Fic. 51. A very Main mature megazooid, 10 u long. [Ithaca. 
Fic. 52. Four megazooids of the second generation from a zooid which had remained 
red twenty-four hours.  [ Burlington. ] 
. All the figures are magnified about 630 times ; in all cases the living plants 
were car Kin measured by means of an eyepiece micrometer and drawn to scal 
s though projected by a camera lucida. ‘The colors represent the average, but ee not 
eas the great variety of tints shown in the living plants under different conditions. 
In most cases m source of the material from which each eee was drawn is appended 
to its descriptio 
