128 Sellai'ds — Structure of Paleozoic Cockroaches, 



Etoblattina mazona Scudder. 



Figure 10. — A nymph approaching maturity. The specimen has suffered 

 lateral crushing, causing a wrinkling of the pronotum and giving the ab- 

 domen probably an unnatural width. 



Figure 11. — A small nymph in which the parts of the ovipositor have not 

 yet united. Two pairs are seen, the outer being larger and more curved, 

 the inner smaller and straighter. Some other organs, probably a third pair 

 of ovipositors, are indistinctly seen. 



Figure 12. — A later stage in which the parts have become united and the 

 ovipositor projects from the abdomen. The enlarged seventh sternum is 

 here seen to lie underneath the eighth, ninth, and tenth terga. 



Figure 13. — A nymph which, having the terga removed, exposes more of 

 the ovipositor and sterna. The view obtained here as a result of the removal 

 of the terga is of the upper (inner) side of the sterna. The ovipositor is 

 seen to pass on the inner (upper) side of the seventh sternum. The impres- 

 sion of the dorsal surface of this specimen shows the ten terga and the cerci 

 in position, confirming the relative position of the seventh sternum and the 

 eighth, ninth, and tenth terga described for the specimen above (Figure 12). 



