A. S. Packard—New North American Phyllopoda. 109 
shield, or carapace, the highest forms having the shortest cara- 
pace, ‘those with the longest shields, as the European Apus 
cancriformis, a in this and other characters to the 
genus Lepiduru 
ction a lite tock fe longicaudatus, Lucasanus, Newberryi, 
and probably Domin 
ection 6 comprises sign equalis, and Gurldi: 
ion ¢ comprises A. caneriformis and porate rt 
Apus longicaudatus Leconte, Ann. N. Y. Lyceum. 
Prof. Dana’s type specimen, which is now very imperfect, was 
labelled ‘Rocky Mountains, near Long’s Peak.” Four speci- 
mens from ‘Texas, J. H. Clark, No. 3.” Three specimens from 
“pools near Yellowstone river. Dr. Hayden, No. 6.” ag 
Chicago Acad. Both sexes occurred, the females having e. 
James's A. obtusatus (Long’s Expedition) is probably this ome 
A. Numidicus Lucas, from Algeria, in the form of the carapace 
= to be avet. to A, longicaudatus. 
us Lucas n. sp.— 6 closely allied to A. longicaudatus. 
Thee: funtal 4 cout rather longer than in longicaudatus, and 
hy ostoma a little smaller. Maxillipeds shorter and smaller, 
telson longer than in the preceding species, with three 
ss Fak pe above. Anal stylets less spi ny, 
segme ae behind posterior r edge o shield 33; no. 
hea Y spined. 
sie 29; no. based oui air of ‘feet il; Seth th of P bol ay 
3 carapace along the middle 80; total length of carapace, “40 
length of te as peataeyS distance from front end of carina to 
a mene” of carapace ‘16 (stylet broken); diameter of egg-sacs 
One € specimen from “Cape St. Lucas, John Xanthus, No. 4,” 
o Acad. 
Apus Ralenn n. § —tThis fine species agar seer we 
A, ca maxillipeds 
nee smooth telson with 3 instead of 4 eee ae sand in 
