248 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 
spines are represented by clusters of hairs and there is a secondary 
series of scales. Kurz lays great stress on the fact that the intestine 
is flexed rather than coiled. Length 0.35 to 0.42 mm.; male 0.3 mm. 
Abdomen only armed with a series of delicate hairs, 
Alona barroisi Moniez. 
We quote the description of Alona barroisi Moniez (’88). This 
form is very incompletely described from a single specimen. Itis said 
to be very small and finely striate. 
‘Tl est extremement petit, beaucoup plus bombe sur le dos qu’aucun autre Alona 
et la bord inferieur de la carapace est fortement arrondi, rappelant ainsi les Leydigia. 
Ce bord est muni de courtes soies; l’ocelle est environ moitie plus petit que 1’ceil, 
Vappendice labial est large et arrondi sur les trois cotes libres; le post-abdomen est 
court, son crochet terminal depourvu d’anguillon a la base, les dents laterales en sont 
courtes et larges et il y a sur les cotes serie de plaques, la carapace est finement striee.’’ 
Island of Terceira, Azores. It is doubtful whether it can be 
recognized. 
I venture to add a few memoranda respecting the long list of names 
which have appeared within this genus and which for various reasons 
are not included in the above list. Unfortunately the list is incom- 
plete and can only serve at best as a sort of guide to the perplexities 
of the synonomy. 
A. anglica Hellich is A. guttata. 
A. acanthocercoides of various authors is A. Leydigia. 
A. aculeatus is Alonella exigua. 
A. angusticaudata Hudendorff is Alonopsis latissima. 
A. balatonica Daday is A. Leydigia. 
A. camptocercoides Schoedler is A. tenuicaudis. 
A. esocirostris Schoedler is Graptoleberis. 
A. excisa is alonella. 
A. elongatus Sars is Alonopsis. 
A. faleata Sars is Leptorhynchus. 
A. grisea is Alonella. 
A. glacialis Birge is a variety of A. guttata. 
A. inornata Hudendorff is A. coronata. 
A. insculpta is Alonella excisa. 
A, leydigia is Leydigia. 
A. lineata Fischer is unrecognizable. 
A. latissima is Alonopsis. 
A. minuta Poggenpol is insufficiently described. 
A. modesta Herrick is A. costata. 
A. nanus is Alonella pygmea. 
A. ovata Baird is uncertain. 
