17 
—is a fossil resin resembling amber, but much less hard and 
less ancient. Its age is Quaternary,—from the elevated 
beaches, now many miles from the sea, of the East Coast 
of Equatorial Africa. The copal-tree, Zrachylobtum Mosam- 
bicense, still lives on the present coast and yields its resin 
freely, but too soft for commercial use. It is extinct where 
the fossil copal is dug. Both the recent and the ancient 
resin are rich in insects, and the latter are illustrated here, 
with representatives of all the seven principal orders. Ex- 
hibited by Prof. Daniel S. Martin. 
gi. DWARF AND TWIN EMBRYOS OF AMPHIOXUS artificially 
produced by shaking apart the blastomeres of the segmenting 
eggs. 
92. KARYOKINETIC FIGURES in dividing cells of the testis of 
the lobster. 
Nos. 91 and 92 exhibited by Prof. Edmund B. Wilson. 
93. LARVZ OF AMPHIOXUS from Sicily. 
94. TADPOLE LARV# OF ASCIDIAN. 
Nos. 93 and 94, exhibited by Mr. Arthur Willey. 
95. YOUNG STURGEONS AND STURGEON CULTURE, illustrating 
mode of hatching sturgeon eggs, as carried on for the United 
States Commission of Fisheries at Delaware City, Del. The 
young sturgeons exhibited are the results of the first success- 
ful attempts in this country in the culture of the river sturgeon, 
Acipenser sturto. Exhibited by Dr. Bashford Dean. 
96. THE DERMAL ARMORING OF THE STURGEON. Anatomi- 
cal and microscopical preparations. Relations to scale types 
of kindred fishes. Exhibited by Mr. George William 
Kosmak. 
97. LIVING AMPHIBIA, a number of rare forms: 
1. Siren, Proteus anguineus, from the Dalmatian caves. 
2. Siren, Szren lacertina, from the rice marshes, South 
Carolina. 
3. Mud-puppy, Wecturus maculatus, from the Miami River, 
Ohio. 
4. Hell-bender, MWenopoma horrida, Ohio River. 
