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 

 l)roduced forward and remarkably developed autennules 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 antenuule 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 antennae are strong and densely ciliate 

 throughout. The whole ventral margin of the shell is armed with 

 distant setae. 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. 



3Ioina fiseheri HeWich 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., antenuule 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 2Iolna, 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 31. 

 paradoxa a small process, and Sars also mentions one in 3L propinqua. 

 This prepares us to find it well developed in the next of kin, 3foina- 

 daphnia. Matile states that this species was first described by Huden- 

 dorf£ (J W) as 3Ioina flagelUda, but I am not prepared to investigate 

 the question. 



3Ioina salina Stephanow was regarded by him as a saline modifica- 

 tion or variety of 31. rectirostris. 



The description of 3Ioina azorica, as given by Moniez, is as follows: 



" Chez sette espece, la tete, dans les deux sexes, est arrondie, sans depression; I'an- 

 tenne du male est terminee non par des crochets, mais par des tentacules qui, sous 

 I'lnfluence de I'alcool, prennent une forme assez irreguliere et dont I'extremite s'in- 

 vagine en doigt de gant; I'antenne port une sole unique a I'endroit de la couibure. 

 Le fcuet de la premiere patte du male est enorme, et mesure 5 fois la longuer de 



