248 GEOL. AND NA.T. HIST. SURVEY OF MINNESOTA.. 



spines are represented by clusters of hairs and there is a secondary- 

 series of scales. Knrz 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. It is said 

 to be very small and finely striate. 



"II 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 decourtes soies; I'ocelle est environ moitie plus petit que I'ceil, 

 I'appendice 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. angUca Hellich is A. guttata. 



A. acanthocercoides of various authors is A. Leydigia. 



A. aculeatus is Alonella exigua. 



A. angusticaudata Hudendorff is Alonopsis latissima. 



A. hahdonica Daday is A. Leydigia. 



A. camptocercoides Schoedler is A. tenuicaudis. 



A. esocirostris Schoedler is Graptoleheris. 



A. excisa is alonella. 



A. elongatus Sars is Alonopsis. 



A. falcata Sars is Leptorhynchus. 



A. grisea is Alonella. 



A. glacialis Birge is a variety of ^. guttata. 



A. inornata Hudendorff is A. coronata. 



A. insculpta is Alonella excisa. 



A. leydigia in 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 pygniea. 



A. ovata Baird is uncertain. 



