280 BOOKS RECEIVED. 


esting event of the meeting was the presentation of a Pteropod (Cline ; 
borealis), a marine animal of the arctic ga which has been discovered 
y Fuller in large quantities in our harbor. This animal be- 
longs to a division of the Mollusca wir Pteropoda, or “ Wing-foot,” 
from the swimming appendages which mble the organs of flightof 
ro . + E 
birds. Only six species are known to occur on the coast from the arctic 
seas to Georgia. They are most abundant in the extreme northern or 
southern oceans. Some possess a delicate glassy or horny shell, while- 
lutions in a jar of sea-water. The Clione moves with a deliberate anù — 
graceful motion of its wings — almost recalling the action of a dexterous i 
human swimmer. The Limacina, another fapio observed by Mi. 
Fuller, and o with the Clione, uses its much more ner — 
vously, and gambols about the jar like a miniature dpe half-fledged robin. — 
It is not pam: that the Clione has ever been seen so far to the south * 
ward before. Packard reports it as abundant on the coast of Labrador. 
This is probably the extreme southern limit of the species, and we are m 
doubt indebted to the persistency of our “cold term” for these fairy-like 
visitors in our harbor. Is our climate so changing its soe quality 
that arctic animals find in our waters a congenial hom 









AMERICAN ASSOCIATION FOR THE ADVANCEMENT OF ‘some 
next meeting will be held at Chicago the last of August. It p 
be an ese! interesting meeting, and we hope it will be all 
tended. Various excursions by the members are ‘one of which, 
however, we wav not received precise information in time o ‘insert it 

CORRESPONDENCE. 
sy ps Ri mi Etna, Ind.— The plant you send appears to be the Lemna, or Due i 
ew York.— The solvent for reeling the cocoons of the Cynt hia Silk 
give en Wwe re Menneville, i jet some carbonate of potash in boiling water, 
ition of white soap; no pro’ porti Pa! | thes 
E. O., Yellow Springs, O.— You write that “ we are enjoying a visitation of 
on yon ee see Brae perfect insect appeared on May 18th. The grow 
ou rea i 8 hogy 
laying the eggs, and for alcoholic. specimens o larv rent sizes 
wg and adult. We can name a few of the beetles you send now 
of the others in a few weeks. 1. Nebria llipes; 3.. 
Dicrelus purpuratus; 5. Ochthedromus Lentini BP Clivina 
chalcites; 18. Harpalus near ene D ; 20. Oiceoptoma marginata; 
qualis; 24. Staphylinus villosus 
Oo 
— RECEIVED <i 
éron, Par B'r 
ae Tes. „SYO, Pp. 2 pp. rad et les Mowimesti du Pi p 
i of North A with Colored Dr s and Descriptions. 
H, Edwards.  Ehllaaetnhi. r "Part „April, d, 1808. Ato, with five plates, $2.00. 
Hasa y. 
and Water April 4, 11, 18, " London. z 
The Field. Apri ril 25 25, May 2, 9, 6. London. e ; 
“hg pes age Monthly Meine, June to December, 1866, 1867, January ©* 
