Some Observations on the Chromosome Vesieles 
in the Maturation of Nudibranchs'. 
By 
W. M. Smallwood. 
With Plate II. 
These observations were made on three species of Nudibranchs 
collected at Wood’s Holl during the summer of 1902. While several 
different forms were secured, the eggs were not obtained for all of 
them in sufficient quantity to permit of a detailed study of the 
problem of maturation in each. This paper then, is confined to cer- 
tain phases of maturation in the eggs of Doris bifida, Montagua 
Gouldii, and Montagua pelata. 
No attempt will be made to give a full account of maturation 
but only of those changes that especially accompany the history of 
the chromosomes; nor will the general literature? be reviewed except 
in so far as it bears on the special problem of this paper. 
The spawn of Doris bifida is long and ribbon like, 3/8 of an 
inch wide; one ribbon was two inches in length. The egg mass 
was always found attached to some foreign objeet, such as the com- 
mon Fucus or eel-grass. The form of the spawn was interesting; 
in several instances the lower margin was attached to the stem of 
the Fucus and while laying the animal had turned nearly around 
so that the band of eggs Kad the appearance of an open flaring 
collar. This was a common shape in the Fucus, but occasionally 
the spawn did not have any definite form, being attached to several 
1 Contributions from the Zoological Laboratory, Syracuse University. 
2 For full review of the literature of maturation see CONKLIN, 02, and 
SMALLWOOD, 04. 
