636 Wisconsin Academy of Sciences, Arts, and Letters. 
line, striated on the inner margin. The fuction of this accessory 
structure is not clear; the external end of the plate appears to be 
attached to the uncus and the inner end to the dorsal tips of the 
rami; it may possibly act simply as a hinge during the movement 
of prehension. The manubrium has a nearly straight central 
section, very broad anteriorly, with a thin lamella at each side, and 
tapering gradually to the posterior end, which ends in a small 
rounded plate or knob. In front of the rami, immediately be¬ 
hind the mouth, there are two slender, right-angled pieces, serv¬ 
ing for the support of the lips. The ventral salivary glands are 
very conspicuous, the right one nearly twice as long as the left. 
The oesophagus is long and begins high up on the mastax. The 
gastric glands are small and round. There is a distinct constric¬ 
tion between the stomach and the intestine; the latter is very small. 
The foot glands are very long, slender, and slightly club-shaped. 
The ovary is large and of irregular, elongate outline; the nuclei are 
unusually large. 
The ganglion is rather small and saccate. The retrocerebral 
organ consists of a small, clear sac and two subcerebral glands 
of the same size as the sac. The eye-spot is at the posterior end 
of the ganglion, and two pigment spots or so-called accessory 
eye-spots are situated on two small projections on the corona, not 
far from the openings of the ducts leading from the sac. 
Total length 500/x; toes 36/^; trophi 75^. 
Eosphora najas appears to be rare in the United States; a few 
specimens have been collected at Los Angeles, California, and so 
far it has not been found elsewhere. 
It seems highly probable that the two names given by Ehren- 
berg represent the same animal, the only difference noted being 
that E. najas is supposed to have shorter toes than E. digitata, 
and this impression may very well have been obtained from ob¬ 
servations of animals with partly retracted toes. As najas is 
the older specific name, and also the type of the genus, we have 
used this in preference to digitata; the two names appear to have 
been used rather indiscriminately by later observers without any 
very good reasons being given for their preference. 
