Near Op IMRT aT eee ee Te Se 
ENTOMOSTRACA OF MINNESOTA. 259 
Pleuroxus personatus Leydig. 
Leydig ’60 (Lynceus personatus); Schoedler ’62, ’63 (Rhypophilus personatus and 
glaber); Norman and Brady ’67 (Lynceus uncinatus); Miiller ’68; Fric ’72 
(Lynceus personatus); Hellich ’77 (personatus and glaber); Herrick ’84; Daday 
788; Matile ’90; Kurz ’74 (glaber). 
Shell high, oval, smaller caudad. Head small, depressed, with 
narrow, long, procurved beak. Macula quadrangular, half the size 
of the eye, to which it is nearer by half than to the end of the beak. 
The shell is either hexagonally reticulate or smooth. The lower 
margin is flexed cephalad of the middle and bears long cilia. The 
- ventro-caudal angle bears two curved spines. The post-abdomen is 
rather broad, narrowed toward the end. Anal teeth 10-11, very large. 
Claw serrate, and with two basal spines. There are seven sete and a 
spine upon the antenne. The antennules are fusiform. Length 0.65 
to 0.67 mm. 
There seems to be no reason to doubt that P. glaber is only a condi- 
tion of P. personatus not even worthy of a varietal name. 
Pleuroxus (Rhypophilus) uncinatus Baird. 
The shell is ridged with lines running upward and backward, as 
in P. bairdii; the lower angle of the shell has three teeth, and the 
beak is more horizontal than in the above. In size and characters 
this is almost identical with P. bairdii, with which it occurs in Eng- 
land. 
This completes the list of swine-like members of the genus; these 
well deserve to be studied from a morphological standpoint. 
The following names may be mentioned, though the list of syno- 
nyms cannot claim to be exhaustive. 
Pleuroxus nasutus Gay is a poorly described form from Chili, re- 
sembling, according to Schoedler, P. ornatus = trigonellus. 
A species of Percantha (Lynceus armatus Gay) is found in Chili. 
P. exiguus Lillj. is Alonella. 
P. griseus is possibly Alonella pygmea but is said to have two teeth 
on the ventro-caudal angle of the shell which is faintly reticulated as 
well as striate. 
P. striatus Hellich is P. gracilis Hudendorff. 
P. striatus Schoedler is Alonella. 
. balatonicus Daday is insufficiently described. 
. excisus Fischer is Alonella. 
. nanus Baird is Alonella pygmeea. 
. levis Sars is P. hastatus. 
. ornatus Schoedler is the young of P. trigonellus. 
. trigonellus Mueller is P. bairdii Schoedler. 
17 
Bo bechgh. Sai hae hs 
