2qq The Philippine Journal of Science 



that the smaller daughter and the gonidium lie in a longitudinal 



plane perpendicular to that which passes through the larger 



^Ifecl^en 26\-Plate 3, fig. 19. This is a nearly mature coe- 

 nobium of the same preparation as the preceding. It measures 

 350 by 420 *. The average spacing of the cells is about \l \u 

 and the number of them is about 3,500. The protoplasts are 

 ovoid and range about from 6 to 7 ,. The mother contains 

 two elongated daughters that occupy the middle and back parts 

 of the coenobium. Even with the hindmost ends of the daughters 

 there are in the mother two abortive gonidia, one on the farther 

 side and one on the nearer. These are about twice the size o± 

 somatic protoplasts and are sunken below the somatic layer. 

 The daughters measure 110 by 160 „ and 90 by 105 ^ The 

 larger one contains two granddaughters of 65 by 75 ^ each, with 

 a pair of gonidia measuring 48 by 50 /, and 40 ^ near the middle 

 and another pair of 50 M and 42 M near the hind end. The 

 nearer granddaughter contains two larger and two smaller 

 gonidia. The contents of the other are obscure. The smaller 

 daughter contains two granddaughters and two gonidia of 45 ^ 

 each. One granddaughter contains two larger and two smaller 

 gonidia, and the other is in an embryonic or pathologic con- 

 dition with the phialopore wide open. Near the middle of the 

 daughter there is a symmetrically disposed pair of rudimentary 

 gonidia about 9 /, in diameter. Such a middle pair of vestigial 

 gonidia is clearly lacking in the mother coenobium. On the 

 same slide there are specimens with other combinations of 

 daughters and granddaughters, and they include hexagonidiate 

 coenobia that are more nearly mature and more nearly globular. 

 Specimen 27.— Plate 5, fig. 31. From Pond C in Pasay on 

 September 20, 1914, material was taken of which some was 

 fixed on the day of collection and some on the following day. 

 Specimen 27 is among the latter. This is a very symmetrical 

 hexagonidiate coenobium measuring 410 by 450 /i. 6 The proto- 

 plasts measure about 4 to 5 p.. The number of cells is about 

 5,000. The daughters of both middle pairs contain six gonidia 

 each. The posterior daughters contain four gonidia each, and 



8 Five and a half years after the photograph was taken the dimensions 

 had increased to 500 by 515 /*. Whether this is all due to additional 

 compression or partly due to hydration of the membranes it is impossible 

 to decide. The magnification of the figure is checked by a photograph ol 

 a stage micrometer that was made on the same plate with the same com- 

 bination of photographic apparatus. 



