ENTOMOSTRACA OF MINNESOTA. 165 
nary limits of the shell. The ephippial female retains more of the 
normal proportion, but the dorsal half of each valve is mostly trans- 
formed, by the development of very pronounced reticular markings 
and thickening, into a two-valved, pod-like case for two perpendicu- 
larly disposed winter ova. The male is elongate, with the head much 
produced forward and remarkably developed antennules and feet of 
the first pair. ‘The former are sharply flexed near the middle at the 
insertion of the muscle, at which point is one short spine and a slen- 
der flagellum. At the end are three curved claws and the sensory 
filaments. The inner branch of the first foot is, as usual, modified to 
form a strong hook, while the outer ramus has a very long curved 
flagellum which protrudes beyond the shell and bears a terminal 
hook. The antennule of the female is attached nearer the eye than 
the base of the labrum, but has no pronounced depression; it is nearly 
cylindrical and but slightly curved, very hairy, and its flagellum is 
at its basal one-third. The antennx are strong and densely ciliate 
throughout. The whole ventral margin of the shell is armed with 
distant sete. The abdomen is rather short, the claws being short and 
slightly curved and bearing a short series of fine spines externally at 
the base and a continuous series of spinules internally. The lateral 
Spines are nine to ten and ciliate. The dorsal part of the posterior 
margin is ornamented with clustered hairs. 
Moina fischeri Hellich is undoubtedly the present species, but there 
seems to be no way to settle the priority of names. 
Length 1.03 mm.; length of head 0.35 mm., antennule 0.27 mm., 
height of summer female 1.08 mm., length of male antenna 0.04 mm., 
length of ephippium 0.6 mm. 
It may be noticed in passing that the generic distinction claimed 
for Moina, based on the absence of the process for occluding the brood 
sac, is not absolute, for we have seen in the case of gravid females of M. 
paradoxa a small process, and Sars also mentions one in VW. propinqua. 
This prepares us to find it well developed in the next of kin, Moina- 
daphnia. Matile states that this species was first described by Huden- 
dorff (76) as Moina flagellata, but | am not prepared to investigate 
the question. 
Moina salina Stephanow was regarded by him as a saline modifica- 
tion or variety of MV. rectirostris. 
The description of Moina azorica, as given by Moniez, is as follows: 
‘* Chez sette espéce, la téte, dans les deux sexes, est arrondie, sans depression; l’an- 
tenne du male est terminée non par des crochets, mais par des tentacules qui, sous 
Vinfluence de alcool, prennent une forme assez irreguliere et dont l’extremite s’in- 
vagine en doigt de gant; l’antenne port une soie unique al’endroit de la couibure. 
Le fouet de la premiere patte du male est enorme, et mesure 5 fois la longuer de 
