558 GEOLOGICAL SURVEY OF THE TERRITORIES. 



EXPLANATION OF PLATE XXII, 

 Anatomy of Artemia and Branchipus vernalis. 



Fig. 1. Nauplius or first larval state of Artemia gracilis from Great Salt Lake. I, 

 first antenuse : II, second antennae, III, mandibles. 



Fig. 2. Arteviia f/racilis ,tromNew Hayen, ovisac and ovary; c, ovary; d, anterior points 

 of attachment of the ovary, the intestine passing between them ; e, e, ovi- 

 ducts. 



Fig. 2a. Artemia gracilis, from New Haven, cells of the cement-gland. 



Fig. 25. The same; end of the long middle lobe, with the cement-gland cells (ec) and 

 the fully developed eggs (egg). 



Fig. 3. Branchipus vernalis. Male generative organs ; f, testis; i', first dilated portion 

 of the testis ; t", contracted portion or vas deferens ; t'", second dilated por- 

 tion, performing the function of seminal vesicle; df, ductus ejacnlaiorius; 

 gf, glandular and accessory apparatus; c, cirrus; f)r, gill of last left foot ; int, 

 intestine; hi, heart or dorsal vessel; hli, ostium, or valvular opening of 

 heart. 



Fig. 4. Branchipus rer«aZis, pale variety, ovisac; a, external wall of the ovisac; b, in- 

 ternal wall of the same ; c, the two ovarian tubes (somewhat twisted and 

 Ktretchedin living specimens^; d, anterior continuation of the.same; e, the 

 two muscular oviducts; /, lateral portion of the cement-gland; g, median 

 portion of the same ; h, female valvularorifice ; ai^, third abdominal segment. 



Fig. 4a. Ovaries (ovt) and oviducts (oi') of pale vai'iety. 



Fig. 4b. Side view of a contracted oviduct. 



Fig. 4c. Branchipus vernalis , oviduct filled with eggs, of an old red female; a, valvule, 

 below which is the orifice ; c, transverse ridge ; d, lateral protuberances ; e, 

 margin of the following segment. 



Fig. 5. Branchipus verHaZis, frontal process of a red male, the right side being the outeI^§ 

 edge, with double-headed papillEe. 



Fig. 5a. One side of same in a pale male. 



Fig. 6. r, s, t, different forms of ocelli or median eye in pale races, $ and 9 • 

 Figs. 1, 2, '2a, 2b, drawn by the author; the others by C. F. Gissler, Ph. D. 



