References
- From the Johns Hopkins University Circulars June 1896 79 81 for
- Reprinted in the Annals 1895 xvi 213 213 for
- 1893 . Mitth. Zool. Stat. Neapel , 10
- 1893 . Ann. Sc. Nat., Zool. , xiv ( 7 )
- 1887 . Arch. de Biologie , vi
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