REVIEWS. 49 
i 
more thriving and fructifies richly, whe ereas the former is a more ——— plant, = has 
never yet been met with in a fructificating state. It is also curious t 
istinct form as the Nephroma arcticum, which is so ipidan aet with = the northern al 
pine and subalpine regions, should nowhere else be represented by any analo, ogous or simi- 
lar form, excepting at Magellan Straits, where the very similar and Dane related Ne- 
phroma antarcticum is met sence Among the ‘Phanerogamous l neira plants, the genus 
Kiigetrumn prese sents tl represented by 
the £: hereas in Antartic ‘America the Empetrum r ubrum is the prevail- 
ing species, unless (as I in lately seen asserted) this latter be also found in Northern 
No a species of oe animal is known with certainty to be com- 
mon to both po 
anini TO THE KNOWLEDGE OF CRUSTACEA, FOUND LIVIN 
IN SPECIES OF THE GENUS AsciIpIA. By T. Thorell. From the 
Transactions of the Paika Academy of Science of Stockholm. 
iii., pp. 84, 14 plates. 4 
In this valuable paper we si avery full account of some curious little 
crustaceans, allies of our common water-fleas found swimming in our 
fresh water pool These strange forms are parasitic in the outer 
thick envelope fest) of the ascidians, or ‘‘shelless clams”; much as 
Pinnotheres ostreum, the little oyster crab, lives as.a guest in the shell 
of the oyster. Observers should be on the look out for them in the 
ascidians of this country. 
ON THE POLYPES AND ECHINODERMS OF NEW ENGLAND, WITH DES- 
CRIPTIONS OF NEW SPECIES. By A. E. Verrill. From the Proce 
= of the Boston Society of Natural Satory, April 18, 1866. pp. 25. 
vo. 
Teona Verrill here gives us a very useful list of all the sea Anem- 
onies, Star-fish and Beche-le-mers, or Sea-cucumbers, as they are often 
ed, which are found on our north eastern coast. To those who 
may be dredging, or engaged in the less erci search for these in- 
teresting forms in the tidal pools, a under the sea a weeds along the 
shore, this pamphlet will be inyalua! 
THE MYRIAPODA or NORTH Pin By Prof. Horatio C. Wood, jr. 
From the Transactions of the American Philosophical Society. Phil- 
ae 1865. pp. 92, illustrated with 3 plates and over 60 cuts. Y 
To en collectors and entomologists generally, the Thousand-legs 
and Centipedes one e occasionally meets — in his rambles, are stumb- 
ling blocks. In this monograph, containi o complete an account of 
their structure and forms, the author Has ne -a great gap in Amer- 
can Natural History. The plates are in the main very well drawn; 
but there has been an oversight in representing all the legs pointing 
towards the tail, which is not the natural position. Those on the 
anterior half of the body should = been directed towards the. iT 
AMERICAN NAT. VOL. I 
a im 
o ial 
