(14) 
base. The clampers of the male are shorter and stouter than in E. vernalis. 
The basal joint is soft and inflated and bears a corneous rounded tubercle at 
its inner base.* The second joint is stout and regularly incurved, strongly 
angulated at its base in front where it is received into the first joint. A 
long strong tooth, about half as long as the joint, extends backward and a 
little inward from near its base. The rounded tip of this tooth is thickly 
set with minute, low, circular elevations, each with a central depression, 
within which is a disk-like elevation, the whole having the appearance 
of a minute sucking disk. The tip of the clasper is expanded and flat- 
tened within so that the inner (anterior) part has a spatulate form, 
while the opposite surface rises into a thick prominent ridge, giving to 
a transverse section of the tip the form of the letter T. The anal 
appendages are linear-lanceolate, as long as the last four segments of the 
abdomen, and plumosely haired to the base. The ovisac of thefemale is as 
broad as long, three lobed behind with the middle lobe the largest. 
Length of a full grown male, including anal stylets, 20 mm., width 6 
mm., across eyes 4 mm., clasper 4.5 mm., frontal appendage 5 mm. by 3 
mm. The largest females were a little more slender than the males. This 
species was first observed at Normal, 111., in clear pools, in April, 1876. 
About a fortnight afterward it entirely disappeared. Another species has 
been sent me by Prof. Bundy, by whom it was taken in Wisconsin. 
Canthocamptns illinoisensis , Forbes. Length 1 mm., color light red. 
Head and first segment united ; five abdominal segments in male, four in 
female. The suture between the first and second segments is not wholly 
obliterated above in the female. 
Last abdominal segment is deeply and acutely emarginate. Branches 
of furca as wide as long, inner bristle plumose, a little longer than abdomen ; 
outer plumose only on outer side, about half the length of the inner. The 
second to fifth abdominal segments have each a row of spinules along ventral 
portion of posterior margin. 
Male with anterior antennae composed of seven joints, the fourth joint 
very short. The front outer angle of the third is produced, the blnnt pro- 
cess bearing three long bristles surrounding a slender olfactory club which 
is as long as the three following joints. The penultimate joint bears a strong 
spine or slender appressed process at the middle of its posterior margin. 
The five outer joints constitute the grasping organ. The posterior antennae 
bear five long bristles at tip, three of which are made prehensile by the oc- 
currence of from eight to twelve short articulations in the middle of the hair, 
allowing it to be bent forward. At the base of these articulations on the 
outer bristle, are two short spinules. Two nearly longitudinal rows of five or 
six strong, short spines each appear on the under surface of the outer joint 
of the antennule. The secondary flagellum, borne as usual on the middle 
of the basal joint, is not articulated, and bears four long bristles, two 
terminal and two on distal half of inner side. The outline of the mandible 
is exactly like that figured by Claus, but it bears about ten teeth, the upper 
thick and blunt, the inner sharp, slender and longer. Several are notched 
Wanting in vernalis 
