The two forms of the chelae of the male of Orchestia.    From Wordnik.com.  [Facts and Arguments for Darwin] Reference

The beachhopper turned out to be the smaller of the two common hoppers from our beaches, Orchestia traskiana.    From Wordnik.com.  [BC Bloggers] Reference

This applies also to the young males of the Shore-hoppers (Orchestia) with regard to the second pair of anterior feet (gnathopoda).    From Wordnik.com.  [Facts and Arguments for Darwin] Reference

Orchestia gryphus, from the sandy coast of Monchgut, alone presents a somewhat similar structure, but in a far less degree; elsewhere the form of the hand usual in the Amphipoda occurs.    From Wordnik.com.  [Facts and Arguments for Darwin] Reference

Thus in the male Shore-hoppers (Orchestia) the second pair of the anterior feet is provided with a powerful hand, as in the majority of the Amphipoda, but very differently constructed in the females.    From Wordnik.com.  [Facts and Arguments for Darwin] Reference

I cannot refrain from taking this opportunity of remarking that (so far as appears from Spence Bate's catalogue), for two different kinds of males (Orchestia telluris and sylvicola) which live together in the forests of New Zealand, only one form of female is known, and hazarding the supposition that we have here a similar case.    From Wordnik.com.  [Facts and Arguments for Darwin] Reference

Among the numerous facts in the natural history of the Crustacea upon which a new and clear light is thrown by Darwin's theory, besides the two forms of the males in our Tanais and in Orchestia Darwinii, there is one which appears to me of particular importance, namely, the character of the branchial cavity in the air-breathing Crabs, of which, unfortunately, I have been unable to investigate some of the most remarkable (Gecarcinus, Ranina).    From Wordnik.com.  [Facts and Arguments for Darwin] Reference

The difference of the sexes which, in the Gammarinae is usually expressed chiefly in the structure of the anterior feet (gnathopoda, Sp. Bate) and in the Hyperinae in the structure of the antennae, is often so great that males and females have been described as distinct species, and even repeatedly placed in different genera (Orchestia and Talitrus.    From Wordnik.com.  [Facts and Arguments for Darwin] Reference

It relates to a shore-hopper (Orchestia).    From Wordnik.com.  [Facts and Arguments for Darwin] Reference

Orchestia.    From Wordnik.com.  [Facts and Arguments for Darwin] Reference