572 
GEOLOGICAL SURVEY OF THE TERRITORIES, 
EXPLANATION OF PLATE XXIX. 
Via. 1. Estheria mexicana Claus, from Kansas (2. caldwelli); first antenna ; ol, olfac- 
ance 
HIG. 
FIG. 
F1aG. 
Fic. 
Fig. 
FIG. 
Fia. 7. 
Fig, 
Fia. 
Fie. 
tory lobes; at, n, antennal nerve. 
la. Terminal joints of the same, filled with olfactory cells; no papill# present. 
1b. Olfactory lobes from near the middle of the antenna. 
2. Estheria mexicana (caldwelli); three terminal joints of the second antennsy, 
showing the nerve-endings and the sense-cells at the base of the sete. 
3. Estheria compleximanus, edge of sixth endite (of Pl. V, fig. 7), showing the 
ends of the tactile nerves leading to base of tactile sete and connecting 
with the marginal nerve; with the two series of independent nerve or 
ganglion cells, X 225 diameters. 
4, Estheria compleximanus Pack.; end of the dorsal lobe or oviger of one of the 
anterior legs (figured on Pl. V, fig. 7), showing the tactile nerve (tr) with 
its ganglionic enlargement near and at the end of the lohe; with the gan- 
glion cells at the base of the sete. 
. Estheria compleximanus, end of 5th endite of ist leg (Pl. V, tig. 5), showing the 
very large crowded ganglionic tactile cells (gc). 
. Branchipus vernalis Verrill. End of 1st antenna, with the three tactile seta at 
the tip; , antennal nerve; gc, ganglion cells, X $A. 
Thamnocephalus platyurus Pack. The 3d or 4th endite of the 1st foot, with n 
the nerve to the endite, the large ganglion cells arranged in quite regular 
series, and tn the origin of a tactile nerve passing into the seta(s); each seta 
is about to moult, as the new setw with the fine setule are present. 
. Thamnocephalus platyurus Pack. Portion of the edge of 1st or innermost endite 
of 1st pair of feet; n, nerve-fibres; gc, ganglion cells; tm, tactile nerves pass- 
ing into the long, slender setz (s), near tn, the marginal row of fine seta. 
8a. Thamnocepholus platyurus Pack. Cuticle of flabellum with nuclei (x) and fine 
tubercles. 
8b. Thamnocephalus platyurus Pack. Cells at base of 5th endite containing fat 
granules. 
Mia. 9. Limnetis gouldit. One eye with the cornea removed, the same specimen as repre- 
sented on Pl. Il, fig. 5. Op. n, optic nerve; the upper op. n. should be op. g, 
optic ganglion. From the peripheral nucleolated cells the nerves with the 
rods (if the latter are present) converge towards the optic ganglion; tr. n, 
transverse nerves arising from peripheral cells and connecting the two eyes. 
All the figures drawn with the camera lucida by the author. 
