488 The American Naturalist. [May, 
Zoological News.—Molluscs.—Garstang, in a catalogue of the 
Nudibranchs of Plymouth, England,! gives many instances of the pro- 
tective coloration of these forms. The author catalogues thirty-six 
species, the whole making with the notes an admirable faunal list. 
J. I. Peck describes? the anatomy and histology of the Pteropod 
Cymbuliopsis calceola. The muscles, digestive organs, nervous system, 
reproductive organs, nephridium, and heart were investigated. € 
nephridium does not communicate with the pericardium, In the in- 
dividual studied no penis was found, although the gonad was in female 
cativity, and the receptaculum was full of spermatozoa. 
Arthropods.—W. F. R. Wheldon thinks’ that the tendency of 
zoee to develop their protective spines in one straight line, parallel 
with the long axis of the body, is of no little advantage in aiding the 
embryo to swim in astraight line, like men sculling in a narrow racing 
boat. 
G. C. Browne catalogues 4 sixteen species of Copepoda, collected at 
Plymouth in 1888-89. The notes are largely synomymical. 
Some interesting notes the on habits of Crustacea’ are worthy of notice. 
Shrimps and prawns keep buried by day, and wander about by night ; 
even those with the eyes extirpated show the same features. Crustacea 
find their food almost exclusively by scent, while it seems probable that 
they cannot see much, possibly not even each other. ‘To light and 
shade, however, they are very sensitive. Certain crabs are fond of 
decorating themselves with seaweed, etc. The crab takes a bit of 
weed in its chelz and deliberately tears it across. He then puts one 
end into his mouth, and after chewing it up, presumably to soften it, 
takes it out in his chelz and rubs it firmly on his head or his legs until 
it is caught by the peculiar curved hairs which cover them. If not 
caught it is chewed again, and the process repeated. This is done by 
night as well as by day, and specimens deprived of sight will clothe 
themselves as do the others. It is noticeable that there isa marked 
bilaterality in the arrangement of this ornamention. It does not ap- 
pear that it is for concealment. 
1 Jour. Marine Biol. Assn., No. 2, p. 173, 1889. : 
? Studies Biol. Lab., Johns Hopkins Univ., IV., p. 335, 1890. 
3 Jour, Marine Biol. Assn., No. 2, p. 169, 1889. 
4 Ibid., p. 144, 1889. 
5 Ibid., p. arr. 
