A16 GEOLOGICAL SURVEY OF THE TERRITORIES. 
Plate XXII, fig. 1, provisionally represents the freshly hatched larva 
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Fic. 43.—Advanced larva of Limnadia hermanni, lettering as in fig. 
of Artemia gracilis, 
which we observed at 
Great Salt Lake, Utah, 
the drawing having 
been made from an al- 
coholic specimen. On 
comparing it with 
Claus’ figure of the 
freshly hatched larva 
or Nauplius of the 
European Branchipus 
stagnalis (Fig. 47) the 
first antenné are seen 
to be much shorter; 
the second pair with 
much shorter and 
smaller sete; while 
the mandibles are 
nearly destitute of 
setae. Moreover the 
body is segmented be- 
hind the mandibles. 
_ Our Salt Lake Ar- 
temia differs from the 
figures of the Euro- 
pean Artemia salina in 
the shorter first anten- 
ne; in the shorter and 
42. sh, carapace valves; int, intestine; J, liver, mnch enlarged. After smaller setze of the 
Lereboullet. 
second antenne. But 
a single larva was, however, observed, and our figure is, though a camera 
drawing, subject to future correction. 
Fie. 44.—Nauplius. freshly hatched, of Apus 
cancrijormis. s, segments behind the mandib- 
ae segment; J, liver; e, simple eye. After 
aus. 
Fig. 45.—Nauplius of Lepidurus 
much enlarged. Aiter Brauer. 
THE GENEALOGY OF THE PHYLLOPODA. 
In considering the question of the genealogy of the Phyllopods, we 
have two sets of considerations to guide us. 
First the embryology, 
anatomy, affinities, and systematic position of the group, and second 
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