Birge—Notes on Cladocera. 
1035 
2. L. parviremis Birge. 
Antennule not angulated; basal part longer than in L. seti- 
fera, flagellum more slender, hairs not so close set and shorter; 
the whole organ much as in Lwtonopsis. Expansion of antenna 
small. Setae about - 5 - ■■ the terminal setae of dor- 
0—1 — 4 
sal ramus longer than others; that of second joint of ventral 
ramus and one of those on terminal joint are also long. Spines 
that of ventral ramus large. Intestine with two 
hepatic coeca, which extend downward toward the inser¬ 
tion of antennules. Leaf-like expansion on ventral side of 
head smaller than in L. setifera, and body less flattened. 
Sixth pair of feet with branchial sac. Antennule of male 
long and slender, with row of spinules along distal part, as in 
male of other Sididae, but with ciliated sensory seta on in¬ 
side near base. Color yellow. 
Length of female 1.8-2.5 mm.; male 1.0-1.5 mm. 
In margin of lakes and ponds among weeds. The com* 
mon species in northern Wisconsin and Michigan. Collected 
by Mr. A. A. Doolittle in Maine. The range of the species 
probably extends over the northern United States, at least 
as far west as the Rocky Mountains. 
3. Latonopsis fasciculata Daday. 
Plate LXVIII, figs. 2, 3, 4, 7, 9, 10. 
This species has been found in Louisiana and Texas. I 
have received numerous specimens, both females and males, 
from Audubon Park, Xew Orleans, though the kindness of 
Mr. E. Foster of that city, to whom I am indebted for many 
courtesies and for much assistance. 
In structure the female very closely resembles L. serricauda 
Sars (’01. p. 6), differing only in the point which caused 
Daday to make it a new species, viz.: the possession of clusters 
of spines on the postabdomen instead of the usual row of 
single spines common in the Sididae. In this feature L. fas- 
ciculata closely resembles P. bidentata. It may also be noted 
