44 CO. Whitman 



a single free nucleus, a single fully formed vermiform embryo, and nu- 

 meroiis germ-cells measuring from .004 mm to .008 mm in diameter. 

 The germ-cells were of the size and appearance ofthose seen in fig. 103, 

 which undoubtedly represents a young Nematogen. The nuclei of the 

 largest germ-cells were from .004 mm to .005 mm in diameter. 



d. ATransitional 1 mm long. The first foiirth of the axial cell 

 occupied by an Infusorigen , six embryouic stages (three fully devel- 

 oped) , and two nuclei ; the remaining three fourths fiUed with scattered 

 germ-cells .006mm — .OOSnim in diam., the larger with nuclei .004mm 

 in diam. Several of these germ-cells in process of division , others in 

 which the division was just completed. 



e. A Transition al .825 mm long. The posterior half of the 

 axial cell contains nothing ; the anterior half shows three free nuclei, 

 one fully formed infusoriform embryo and three incompletely developed, 

 and crowded germ-cells from .004 mm — .008 mm in diameter. 



4. D. moschatum 1.80 mm long, from E. moschata^ Feb. 7. A 

 portion of this Dicyemid seen in fig. 40, PI. 3. The axial cell contained 

 besides three large free nuclei nothiug but cells , which were crowded 

 towards the two ends , but distributed in a loose row along the middle, 

 as seen in the figure. 



These cells were of two kinds, one spherical (.007 mm — .01 1 mm) 

 with a large nucleus (.005 mm — .006 mm) , and one ellipsoidal or fu- 

 siform (.007 mm X .015 mm) with smaller nucleus (.004 mm). The 

 latter were often found in pairs , lying in close contact within vacuole- 

 like Spaces. In some cases the line of divisiou betweeu the two could 

 not be clearly distinguished. In most of these elongated cells the pro- 

 toplasm was striated in the direction of the longer axis. 



From what I have seen in other similar cases, I believe these cells 

 are in process of multiplication by division. It is probable that the 

 spherical cells, after attaining a certain size, divide, producing two cells 

 which assume the elongated form preparatory to a second di vision. 

 This individuai represents a transitional form derived from a Rhomb- 

 ogen in which there was but one Infusorigen. 



5. B. moschatum 3.92 mm long, from E. moschata, Feb. 8. The 

 anterior portion of the axial cell for about 1 mm occupied by numer- 

 ous Infusoriform embryos emanating from a single Infusorigen. The 

 larger infusorific germ-cells .016 in diam., nuclei .01 mm. 



In the bind third of the axial cell a single free nucleus (.035 mm X 

 .03mm) with nucleolus .0025 mm, and numerous loose germ-cells 



