592 GEOLOGICAL SUEVEY OF THE TERKITORIES. 



EXPLANATION OF PLATE XXXIX. 



FiG- 1. End of postabdomen with the furca of Artemia salina taken from the Kujal- 



niker salt lake in spring, 1871, at 8° Beaum6, after an inundation. 

 Fig. 2. The same part of an Artemia salina taken in summer, 1872, at 14° Beanm^, from 



the Kujalniker salt lake. 

 Figs. 3 and 4. The same parts of the already more changed Art. salina, taken from 



the same lake in summer, 1873, at 18° concentration. 

 Fig. 5. The same part of an Artemia forming a transition between Art. salina and Art. 

 milhausenii. Taken from the same lake in the first half of August, 1874, at 

 23^° concentration. 

 Fig. 6. End of the postabdomen of an Artemia which I take for Art. milhausenii. 

 Taken from the same lake in beginning of September, 1874, at 25° concen- 

 tration, when salt began to deposit itself. 

 Fig. 7, One of the middle gills of Art. salina. 

 Fig. 8. One of the middle gills of Art. milhausenii. 



Fig. 9. The lower part of the postabdomen of au Art. salina taken from the Hadschibei 

 Lake at 10° concentration. 



a, end of the sixth segment ; i, seventh segment ; c, long eighth segment 

 with the furcal lobes; d. bristles occurring at the end of each segment 

 before the articulation (but two have been drawn of each ring) ; e, the 

 same bristles nearly in the middle of the eighth segment. 

 Fig. 10. The lower part of the postabdomen of a young specimen of the third genera- 

 tion of Art. salina, which was domesticated in gradually diluted salt water 

 for the purpose of yielding progressive growth. 



a, end of the sixth segment ; b, seventh segment ; c, eighth segment ; d, 

 ninth segment ; e, two of the bristles fi'om the bristle-ring occurring at 

 the end of each segment before the articulation ; /, spot where the long- 

 eighth segment divided into two segments, the eighth and ninth. 

 Fig. 11. A group of cuf icular cells found near the base of the above-mentioned bristles 

 of the postabdomen of Art. salina, whose lower part is illustrated by Fig. 9. 

 Fig. 12. A group of denticular spines found uear the base of the bristles of the post 

 abdomen of progressively changed individuals of Art. salina, whose lower 

 part of the postabdomen is illustrated by Fig. 10. 

 Figs. 1 to 10 are 65 times, 11 and 12 are 330 times magnified. Copied from Schmau- 

 kewitch. 



