, | 
Zoology. Z 295 
cs 
cther small small trilobites too indistinct for absolute determination; one 
seems to be nearly allied to the genus Bathyurus (Billings). The speci- 
few Lingule, + satin while they way be LL, —— of New — dre beer 
rome Garnet.—\ have recently revert a beautiful ar a 
green garnet in Oxford, Canada, in ealcareous spar with millerite. It is 
massive, ranular, or in transparent ae cri ot resembles ouva- 
rovite, but is essentially a lime-alamina garnet 0 p. c. of oxyd of 
chromium. I shall soon send you a full Sessstgtion with an analysis 
ontreal, Jan. 21st, 1861 
Ill. ZOOLOGY. 
1. Contributions to the Natural History of the United States; by 
Lovis Acassiz, Vol. III.— eres in general—Ctenophere. Nothing 
goes farther to prove the necessity of a wide and far-r eaching study of 
animate nature than the faets brovght to light by the ee igs of jelly- 
fis es. It t is the misfortune most eralnaes! text- hooks of popu- 
Teservoir, into which to pour all small objects that cannot easily be seen. 
Again, naturalists are led, by such partial studies to make many false gen- 
eralizations ; such as, that the rapidity and force of motion are in direct 
ratio to the : size of the nervous centres and to the perron. of the mus- 
cular se ; whereas we see wh meduse as Cory Lee sia) and Pleu- 
ertebrates To this may be added the false ideas of rank among 
the die groups ; placing the whole of the Articulata below Verte- 
rata; the whole of the Mollusca below Articulata, and the whole of the 
paris 
complex mechaniam Hines Ae Ae aoa Vache or ‘the hd 
| “ Rotife 
hyivea like this third volume of “ Bontribasot: will do much to which 
penae of scientific men, those broad and philosophical views, w ich 
confined to the say We “a have rev ne to 
Syne x 2 clase which includes in its apparently humble : 
