1889 ] ON SOME FRESHWATER OSTRACODA AND COPEPODA. 63 



first sight, appears as the immediate continuation of the basal 

 part. This ramus is composed of 3 joints, the 1st rather large 

 and of oblong oval form, without any setae or spines, the 2nd 

 rather smaller and inside prolonged to a strong, slightly curved 

 and compressed, unguiform process, finely denticulate along the 

 inner edge. The last joint (see fig. 15) is so very small as 

 easily to escape attention, and is not distinctly defined from the 

 preceding, on the outer side of which it appears to be located. 

 It is nearly quadrangular in shape and provided at the tip with 

 2 unequal spines, the inner of which is rather elongate; at the 

 base of this joint, moreover, a very small denticle occurs on the 

 outer side. The inner ramus has the form of a very narrow, 

 cylindric appendage issuing from the inner somewhat produced 

 corner of the last segment of the basal part. It is uniarticulate 

 and reaches nearly to the end of the 1st joint of the outer 

 ramus: at the tip it is provided with 2 unequal spines, and along 

 the inner edge, to some distance from the apex, a few cilia 



The body is in a living state of the animal rather pellucid, 

 with a more or less distinct bluish green tinge, the anterior 

 division being more deeply coloured than the posterior. On each 

 of the anterior antennae, moreover, a very conspicuous bright 

 bluish transverse band is constantly found somewhat beyond the 

 middle, or comprising the 16th to the 19th joint. The outer 

 6 joints contain in their interior an opaque whitish pigment. 



Inner organs. — The body being rather transparent, several 

 of the inner organs may be more or less distinctly traced 

 through its walls. Thus the eye is easily distinguished lying 

 within the frontal part of the body nearer the ventral face. 



is rather small and of comparatively simple structure, exhi- 

 ltln g a dark red pigment, from either side of which a clair 

 refracting body protrudes. Immediately behind the eye the 

 cephalic ganglion is faintly traced. — The intestine may best 

 e examined in a lateral position of the animal (fig. 13). Espe- 

 *«ly the anterior dilated division is very distinct by its gene- 

 y bri S ht yellowish green colour, whereas the posterior 



