130 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 
Canthocamptus brevipes Sars. 
This small form is almost certainly the young stage of some other 
species; yet I transcribe the description: 
“‘Corporis forma et magnitudine C. pygmzeo non dissimilis. Segmenta abdomi- 
nalia vero postice magis attenuata seriebusque aculeorum destituta. Rami caudales 
elongati duplo longiores quam latiores, setis apicalibus brevisculis parumque diver- 
gentibus, exteriore dimidiam longitudinem interioris nonattingente. Operculum anale 
absque dentibus. Antenne 1-mi paris breves, articulis ultimis duobus in unum con- 
fluentibus articulum. Pedes natatorii brevissimi, ramo exteriore intus setis destituto, 
interiore biarticulato in pedibus 1-mi paris longitudinem exterioris sequante, in 
sequentibus multo breviore. Pedum 5-ti paris articulus basalis intus in processum 
foliiformem, sat magnum et angustatum, articulum ultimum elongato-ovatum aliqu- 
anto superantem, exit. Color albidus. Longit. parum supra + mm.”’ 
Canthocamptus crassus Sars. 
Robust; segments margined with pectinate bristles. Caudal stylets 
oval, contorted, constricted at the base. Antenne thick, densely 
covered with long sete. Fifth feet with long sets; basal process 
rather small. A1l the feet excepting the first, with biarticulate inner 
rami. Length 0.75 mm. 
Canthocamptus trispinosus Brady. 
PLATE L, Fie. 6. 
This species with the last and next has all the feet save the first 
with biarticulate inner rami. Very near the next, from which it 
differs in the form of the fifth foot of the female, which has the basal 
process smaller, bearing only three spines, while the next has six, the 
second joint being longer and narrow. ‘The male is unknown. Not 
yet identified in America. 
Canthocamptus northumbricus Brady. 
PLATE XXIX, Fias. 20-22. 
30dy robust; antennie long as first segment, nine-jointed; mandi- 
bular palp minute. In the male the inner branch of the third foot is 
three-jointed and dactylate, as in C. minutus. 
* Canthocamptus northumbricus Brady. Var. americanus Herrick. 
PLATES X XIX, Fias. 6-14; XX XIII, Fias. 3-5. 
One of our most common species is very near the English form; so 
near, in fact, that I dislike to remove it from it. A few points of 
divergence, however, may be mentioned. 
The form and proportions are much like those of C. minutus. The 
head is large and ends ina prominent bent beak. The antennée are 
= en 
