Description of Two New Phyllopoda. 29 



the oars originate. The ventral ganglion chain can only 

 be observed by dissection, and would seem to agree perfectly 

 with that in Limnadia, consisting of 2 long, juxtaposed 

 nerve- stems, which in each segment form a very slight 

 ganglionic swelling, and are connected at that place by a 

 double transversal commissure. 



The ovaries (see PI. II, fig. 3) may be faintly traced 

 through the integuments as 2 somewhat irregularly twisted 

 tubes extending throughout the trunk on the sides of the 

 intestine, each sending off ventrally a short oviduct, which 

 debouches at the base of the 11th pair of legs. By dis- 

 section parts of the ovary can be isolated and submitted 

 to a closer examination (PI. IV, fig. 6). It is then found 

 that, as in Limnadia, the ova are developed within 

 follicles springing from the surface of the ovarial tubes. 

 Such egg-follicles occur on the same ovary in all stages of 

 development from very small subcylindric lobules to rather 

 large globular bodies. In all the follicles 4 cells are 

 combined (see figs. 7, 8), of which only the distal one 

 represents the true ovum, whereas the other 2 are so-called 

 nutritive cells. The latter become at last Avholly absorbed 

 by the true egg-cell, which rapidly increases in size and 

 becomes filled with an opaque granular yolk-mass. The ripe 

 ova, when poured off from the ovarial tubes, are accumu- 

 lated within the dorsal part of the shell-cavity, form- 

 ing there an irregular mass (see PI. II, fig. 1, 2). They 

 are comparatively small and of a rounded form, each being 

 provided with a rather firm shell or capsule. On a closer 

 examination, this shell exhibits (see PI. IV, fig. 10) a very 

 uneven surface, being divided into depressed hexagonal 

 facets, the angles of which protrude as pointed projections. 

 When rendered pellucid by the aid of oil of cloves (fig. 9), 



