CRUSTACEANS. 
335 
Ci Ut>. IX. 
threw some shells towards the hole. One rolled in, 
a “d three other shells remained within a few inches of 
the mouth. In about live minutes the crab brought 
the shell which had fallen in, and carried it away 
t° the distance of a foot; it then saw the three other 
s hel]g lying near, and evidently thinking that they 
'^ight likewise roll in, carried them to the spot where 
't had laid the first. It would, I think, be difficult to 
distinguish this act from one performed by man by the 
ai( l of reason. 
With respect to colour which so often differs in the 
Wo sexes of animals belonging to the higher classes, 
Spence Bate does not know of any well-marked 
'“stances with our British crustaceans. In some cases, 
lowever, the male and female differ slightly in tint, 
(“t Mr. Bate thinks not more than may be accounted 
by their different habits of life, such as by the 
'“ale wandering more about and being thus more ex- 
ited to the light. In a curious Bornean crab, which 
'“habits sponges, Mr. Bate could always distinguish the 
s “Xcs by the male uot having the epidermis so much 
bibbed off. Dr. Power tried to distinguish by colour 
sexes of the species which inhabit the Mauritius, but 
“Way s failed, except with one species of Squilla, pro- 
J ably the S. stylifera, the male of which is described as 
>oing « 0 f a beautiful blueish-green,” with some of the 
appendages cherry-red, whilst the female is clouded 
Wli brown and grey, “with the red about her much 
less vivid than in the male .” 10 In this case, we may 
s “ s pect the agency of sexual selection. With Sa- 
P“ifina (an oceanic genus of Eutomostraca, and tliere- 
° r e low in the scale) the males are furnished with 
k Mr. 
Mr. Ch. Eraser, in ‘Proc. Zoolog. Soc.’ 1869, p. I 
• Bate for the statement from Dr. Power. 
I am indebted 
