500 GEOLOGICAL SURVEY OF THE TERRITORIES. 
occurring in the south of France. Our A. salina is rather a middle 
form between A. salina Joly and our large race of A. salina (var. a.). 
The considerably prolonged furca and the rather thin female claspers 
(males were unknown to Joly) of A. salina Joly recall these parts in the 
mentioned variety, but the body-length and the proportional length of 
the abdomen agree with the same characters of our A. salina. The 
mean concentration of the salt water Joly mentioned for his species 
corresponds better with the mean concentration for our variety a. of A. 
salina. Besides, according to the drawing of Joly, in his Artemia salina 
the sixth apodous (Joly’s fourth) segment of the abdomen is a little 
longer than the seventh, but in our A. salina the sixth apodous abdom- 
inal segment is usually a little shorter than the seventh; still it be- 
comes longer only at too high concentration of the salt water and also 
in younger stages of the specimens. In mature specimens of our A. 
salina is the sixth segment especially longer when the concentration of 
the salt water does not change from year to year, but in a shorter time, 
as, for instance, from spring towardsummer. The relative length of the 
sixth and seventh apodous abdominal segments in our A. salina may 
also serve as a measure for determining the age of already mature speci- 
mens at a given concentration of the salt water, since the seventh apo- 
dous abdominal segment prolongs with the age, and when this segment 
in heightened concentration of the salt water, also in mature specimens, 
remains equal with the sixth or shorter, it indicates that sexual ma- 
turity appears under such conditions a little earlier than the full devel- 
opment of the body-parts. In variety a. of our A. salina is the sixth 
apodous abdominal segment generally somewhat longer than the 
seventh, which corresponds with the illustration of Joly and the usually 
not sexually mature specimens of our A. salina. 
The male claspers of our A. salina are. as alluded to above, of the 
Same form as figured by S. Fischer for his A. arietina (Middendorf’s 
Sibir. Reise, vol. If, part i, Pl. VII, fig. 32), but the termination of the 
upper antenne separates, according to the description and illustration 
of S. Fischer, this form from Artemia salina. 
Concerning the diagnosis of A. salina Grube (Branchipus salinus Grb.) 
it remains unknown wherefrom Grube took the statement, that in this 
species there are eleven bristles on the edges of the terminal plates 
(lobus tarsalis Grb.) of the legs. The lobus tarsalis Grb. is the palette 
of Joly, as expressed by Grube, but Joly points out 30 to 38 bristles on 
each such plate. I believe that this is a mistake in Grube’s diagnosis, 
and that Grube counted eleven bristles from Jolvy’s illustration on an- 
other foot-plate of Art. salina, that is, on one of those plates which 
Grube! ealls himself lobt tibiales. This mistake in Grube’s diagnosis 
can be sufficiently cleared up by the comparison of the description and 
illustration of Joly with Grube’s diagnosis and synonyms, which Grube 
mentions for the terminology of these lobes in these animals after various 
authors. 
{I wonder that I have not hitherto succeeded in finding that species ~ 
which 8. Fischer described from the neighborhood of Odessa? under the 
name of Artemia arietina. The principal and very great difference of 
A. arietina consists, according to Fischer, in that the terminations of 
the first pair of antenne in this species are divided into two branches, 
whereby the end of one branch bears two olfactory bristles, but the end 
of the other bears two prolonged bristles, while in all Artemice collected 
1“Bemerkungen tiber die Phyllopoden,” Archiv f. Nat. 1853, p. 141. 
. 2 Middendort’s Sib. Reise, Vol. II, part i, pp. 156 to 157. 
