500 GEOLOGICAL SURVEY OF THE TERRITORIES. 



occurring in the south of France. Our A. salina is rather a middle 

 form between A. salina 3o\j and our large race of J., saliiui (var. a.). 

 The considerably prolonged furca and the rather thin female clasi)ers 

 (males were unknown to Joly) oi A. salina Joly recall these parts in the 

 mentioned variety, but the body-length and the i)roportional 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 toward summer. 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 fitll devel- 

 opment of the body-parts. In variety a. of our A. salina is the sixth 

 ajjodous 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. Eeise, vol. II, part i, PI. VJI, fig. 32), but the termination of the 

 upper antennse sei)arates, according to the description and illustration 

 of S. Fischer, this form from Artemia salina. 



Concerning the diagnosis of A. salina Grube {Branclii'pus salinus Grb.) 

 it remains unknown wherefrom Grube took the statement, that in this 

 species there are eleven bristles on the edges of the terminal i)lates 

 (lobus tarsalis Grb.) of the legs. The lobus tarsalis Grb. is the palette 

 of Joly, as expressed by Grube, but Joly i^oints 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 Joly's illustration on an- 

 other foot-plate of Art. salina^ that is, on one of those i)lates which 

 Grube ^ calls himself lohi tibiales. This mistake in Grube's diagnosis 

 can be sufi&ciently cleared up by the comparison of the descrij)tion 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 S. Fischer described from the neighborhood of Odessa^ under the 

 name of Arte7nia arietina. The principal and very great difference of 

 A. arietina consists, according to Fischer, in that the terminations of 

 the first pair of antennae 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 Artemite collected 



1 "Bemerkungen iiber die Pliyllopoden," ArcMv f. Nat. 1853, p, 141. 



2 Middendorf's Sib. Reise, Vol. II, part i, pp. 156 to 157. 



