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 antennz; II, second antenna, III, mandibles. 
Fic. 2. Artemia gracilis, from New Haven, ovisac and ovary; 0, 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. 2b. 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; t, testis; ¢’, first dilated portion 
of the testis; 1’, contracted portion or vas deferens; t/’’, second dilated por- 
tion, performing the function of seminal vesicle; dt, ductus ejaculatorius ; 
g, glandular and accessory apparatus; c, cirrus; br, gillof last left foot; int, 
intestine; hf, heart or dorsal vessel; hh, ostium, or valvular opening of 
heart. 
Fic. 4. Branchipus vernalis, pale variety, ovisac; a, external wall of the ovisac; b, in- 
ternal wall of the same; c, the two ovarian tubes (somewhat twisted and 
stretchedin living specimens); d, anterior continuation of the same; e, the 
two muscular oviducts; /f, lateral portion of the cement-gland; g, median 
portion of the same; h, female valvular orifice ; ab?, third abdominal segment. 
Fig. 4a. Ovaries (ovt) and oviducts (ov) of pale variety. 
Fic. 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 vernalis, frontal process of a red male, the right side being the outer 
edge, with double-headed papille. 
Fig. 5a. One side of same in a pale male. 
Fie. 6. r, 8, t, different forms of ocelli or median eye in pale races, ¢ and 9. 
Figs. 1, 2, 2a, 20, drawn by the author; the others by C. F. Gissler, Ph. D. 
