ORCHESTIA. 
25 
well aware of the variation of the form of the legs in 
the opposite sexes of the type of the genus is fully 
evidenced by an original drawing now in the Hopeian 
collection at Oxford, containing highly-magnified figures 
of the fully-developed male, of a variety of the male 
with smaller second legs and undilated hind legs, and of 
the female with simple legs, the sexes being indicated, 
and the species named “ Orchestia littorea ,” in Dr. Leach’s 
peculiar handwriting. Liljeborg had also, in his account 
of the Crustacea collected by Dueben in Norway in 1844, 
noticed the sexual distinctions of Orchestia littorea i de- 
scribing the female as exhibiting the typical form of 
Talitrus , and the male that of Orchestia , the female, in 
fact, closely resembling the Talitrus tripudians of Kroyer 
except in the length of the fourth and fifth pairs of legs, 
as compared with those of the second pair. The genus 
was previously confounded with Talitrus 3 and the female 
continued so until Fr. Muller pointed out the relative 
distinction of the second pair of hands, and their near 
resemblance to those of Talitrus ,* Dana has more 
recently divided the genus, distinguishing those in which 
the female has the first pair of legs not developed into a 
subchelate or prehensile hand (in fact, a true Talitrus) ; 
while the male is a true Orchestia ; that is, having the first 
pair of legs subchelate. This division, under the name 
of Talorchestia , together with those of Talitrus and 
Orchestia , he considers to be but subgenera of the genus 
Orchestia . 
The genus Orchestia is perhaps the most cosmopolitan 
amongst the Crustacea, and may likewise be classed 
amongst the most terrestrial species of Amphipods. It has 
been taken from the north of Europe to Cape Horn, and 
Archiv. fur Naturgescliiclite, 1848, p. 53, 
