. Annual report. 1st-12th, 1867-1878. Geology. PACKARD.] PHYLLOPODS OF NOKTH AMERICA. 331 o^ they are not varietal. It appears, then, that we have but one North American species of Artemia so far as yet known. Upon comparing our species with the European it is difficult to find good differential characters, as the portions of the body where specific differences would be expected to occur are liable to considerable varia- tion. Upon comparing a number of females from Great Salt Lake with a number of females of the maleless generation from Trieste, Aus- tria, received from Professor Siebold, the
. Annual report. 1st-12th, 1867-1878. Geology. PACKARD.] PHYLLOPODS OF NOKTH AMERICA. 331 o^ they are not varietal. It appears, then, that we have but one North American species of Artemia so far as yet known. Upon comparing our species with the European it is difficult to find good differential characters, as the portions of the body where specific differences would be expected to occur are liable to considerable varia- tion. Upon comparing a number of females from Great Salt Lake with a number of females of the maleless generation from Trieste, Aus- tria, received from Professor Siebold, there are really no differences of importance; our A. gracilis (Verrill's/er- e ant antl tilis) is slighter, with a smaller head, and v ^ perhaps the 2d antennae are a little slighter in build; I see no essential differ- m(1 ence in the form of the ovisac, while the mx—^'"--' shape of the legs, especially the 6th en- dites, is essentially the same. The length pes" of females (as well as males) is the same in both species. Upon comparing a good many males from Great Salt Lake with several, both stained with carmine and unstained, re- ceived from Cagliari, Sardinia, through Prof. J. McLeod, of Ghent, the European A. salina is seen to be considerably stouter, the head wider, the eye-stalks longer and larger, and the eyes larger; the frontal button-like processes of the first joint of the claspers are nearly twice as large as in the American species, and a little more pointed, while the claspers themselves are larger and stouter. The legs and sixth endites are of about the same form. The most apparent differ- ence is in the caudal appendages or cer- 2^2^^?^* £&g£ COpodS, Which in A. Salina are Several ««*', 2d antennas; mil, mandibles; mx, niax- ,• i „ ,, • 4 -7. -i • • illte; pes, foot: o, ovisac. times larger than m A. gracilis, being in the Sardinian specimens nearly three times as long and much larger than in our species. In this respect the genus sho
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