192' The Philippine Journal of Science 



the picture, an abortive gonidium with diameters about two 

 and a half times as great as those of the neighboring somatic 

 protoplasts. They are sunken below the somatic layer. The 

 asexual daughter contains two embryos and one gonidium. 

 The gonidium is the smaller body and measures about 46 p.. 

 It has a very small vestigial mate of about 7 + The embryos 

 are about in the 8- and 4-celled stages. Their details do not 

 show very clearly through the coenobium walls of the mother 

 and the daughter. The female daughter will be described under 

 another head. 



Specimen 9.— Plate 2, fig. 12. This is an asexual coenobium 

 with three sexual daughters in which female reproductive bodies 

 predominate. The daughters are all headed forward with the 

 mother, and all show absence of reproductive bodies in their 

 • forward parts. On the farther side of the mother, on a level 

 with the middle of the smaller daughter, there is an abortive 

 gonidium of about 13 by 16 p. The daughters will be described 

 with the female coenobia. On the same slide with this speci- 

 men there is another with three female daughters of similar 

 proportions and one with four that form a pair of larger and 

 a pair of smaller ones. 



These nine specimens illustrate the fact that in this material 

 the asexual coenobia bear from one to four gonidia that are 

 already large in embryonic coenobia and reach a very great 

 size before dividing. When four are present they form two 

 pairs, a pair of large ones on opposite sides of the middle of 

 the coenobium and a pair of smaller ones on opposite sides of 

 the hindmost half, third, or quarter of the coenobium and in or 

 near a longitudinal plane normal to the longitudinal plane pass- 

 ing through the other pair. When only three gonidia are present 

 it is usually one of the smaller pair that is absent, and when 

 only two are present it is usually both of the smaller pair that 

 are absent. When only one is present it is usually one of the 

 larger pair, and the daughter produced occupies only its own 

 side of the mother. The absent members, when less than four 

 are present, are represented by what may fairly be regarded 

 as abortive gonidia of about one and a half to three times the 

 diameter of the somatic protoplasts, that are formed in the 

 coenobium wall at places where gonidia would be expected and 

 sink below the level of the neighboring somatic cells. Indica- 

 tions are not wanting that some of these coenobia contain 

 traces of a third pair of gonidia located in nearly the same 



