References
- 1896 . Ann. & Mag. Nat. Hist. , March
- 1896 . Development of Scorpio fulvipes . Quart. Journ. Micr. Sci. , xxxii “Some newly-hatched Specimens of Opisthophthalmus Proc. Roy. Phys. Soc. Edinb.
- Ann. & Mag. Nat. Hist. ser. 6 , xii Kraepelin's arrangement (Hamb. Wiss. Anst. 1890 and 1893), which is later, is almost identical as regards the main groups.