‘ ii
PLA'fE IV.
1. A. melleus, and section, one-tliird nat. size.
2. A. equestris, two-tliirds nat. size.
3. A. imbricatus, and section, half nat. size.
4. A. sulfureus, and section, two-thirds nat. size.
5. A. gambosus, and section, half nat. size.
6. A. albus, and section, two-thirds nat. size.
7. A. nudus, and section, small specimen.
P l a t e 4 .
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