578 GEOLOGICAL SURVEY OF THE TERRITORIES. 
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EXPLANATION OF PLATE XXXII. 
1. Apus lucasanus Pack. Section through the body, with the intestine removed 
md, mandible; ant!,ant?, Ist and 2d antenne; leg!, first pair of legs; br. 
flabellum ; ov, “ovary; ng, ganglionic chain. 
2. Transverse section throu oh” the body at the 7th or 8th pair Oe feet, the 
shell removed, mus, dor er Sel adductors of the feet, crossed by the ad- 
ductors of the exites ; ht, heart; int, intestine; ov, ovary ; n. g, ventral 
ganglion; en'—en®, endites; br, gill; ji, flabellum; x, subapical lobe. 
2a, Ist antenna; 2b, 2d antenna; 2c, the extremity of 2d antenna, with 4 bead- 
like joints, sho wing the three imperfect joints, the third ending in a monili- 
- form portion. 
3. Maxillipede with the gill (br) and single endite. 
4, 4a, dorsal and lateral view of the brain of the European Apus cancriformis; br, 
brain ; com, commissure to subeesophageal ganglion; g op, optic ganglion; 
0c, ocellus ; oes, end of esophagus. 
5. Brain and part ot ventral cord of Apus cancriformis; oc, nerve #o ocelli; ant, 
ant, first and second antennal nerves; G!, cesophageal ; Ge niandibular 
ganglion, sending off three mandibular nerves (n md); d, descending (80 - 
phageal nerve; h, unpaired or lower esophageal ganglion; oes, nerve pass- 
ing to the muscles of the esophagus. 
6. Heart of Apus cancriformis. 
7. Apus longicaudatus, portion of embryonic membrane lying next to the chorion, 
and supposed to represent the amnion in Limulus; the nuclei in many of 
the cells have become absorbed. 
8, An egg of the same, showing the cellular nature of the amnion. 
8a. A portion of the same amnion seen sideways of the egg. 
Fig. 1 drawn under the author’s direction by J. 8S. Kingsley; Figs. 4, 4a, 5,-and 6, 
copied from Zaddach; the remainder drawn with the camera by the author. 
