508 Wisconsin Academy of Sciences, Arts, and Letters. 
Cephalodella eva is fairly common in weedy ponds with soft' 
water. We have collected it in Vilas and Oneida Counties, Wis¬ 
consin, and around Atlantic City, New Jersey. According to 
Dixon-Nuttall and Freeman this species is very variable, especially 
in the form of the toes; we have not found this to be the case: 
all the specimens that we have seen are very constant, both in form 
and size. We are inclined to believe that the varieties described by 
them may belong to one or more different species. 
CEPHALODELLA TENUISETA (Burn). 
Plate XXXV, figure 7. 
Furcularia tenuiseta Burn, Science Gossip, vol. 26, 1890, p. 34, text fig. 
DiaschiBa tenuiseta Dixon-Nuttall and Freeman, Journ. Eoyal Micr. 
Soc., 1903, p. 138, pi. 1, fig. 2. 
The body is elongate, fairly slender and nearly cylindric. The 
head is large, but relatively short, and obliquely truncate anteriorly. 
The neck is well marked. The abdomen is unusually long and 
slightly gibbous posteriorly; the lorica is very flexible and the 
plates faintly marked; the lateral clefts are narrow anteriorly 
and slightly wider at the extreme posterior end of the lorica. The 
foot is short and bluntly conical with a small, rounded tail at mid¬ 
length. The foot glands are very small and pyriform. The toes 
are half as long as the body, very slender, slightly recurved, and 
gradually tapering to acute, conical points. 
The corona is convex and slightly oblique without projecting 
lips. 
The mastax is large and of the normal type; the fulcrum is 
slightly expanded posteriorly and the manubria rodlike, not 
crutched. The oesophagus is very long and slender. 
The ganglion is very long and saccate. The retrocerebral organ 
and eyespot are absent. 
Total length SSO-SQOju; toes 120-125ju. 
Cephalodella tenuiseta was originally described from freshwater; 
we have found it only among algae and detritus in brackish and 
saltwater ditches around Atlantic City, New Jersey. Specimens 
collected by the late C. F. Eousselet at Stowmarket, Suffolk, Eng¬ 
land, agree with our material in every way except in having much 
longer toes. We have not been able to find any other differences 
and believe that they are simply local variations of the same species. 
