440 Scientific Intelligence. 
angle with the meridian of more than 34°. Their mean was 18° west. 
e remaining 29 bore 91 leaves; which made with the meridian the 
following angles, viz: Seven made angles g greater than 35°; fifteen, angles 
tween 35° and 20°; sixteen, angles between 20° and 8°; twenty-eight, 
angles between 8° and 1°; and twenty-five, angles less than 1°, 
Of the 69 angles Jess than 20° the mean is N. 33’ E, i.e. about half a 
degree east of the meridian. The error e azimuth, from my want of 
means to determine the time accurately, may have been as much as three 
times this quantity. One half the leaves se within about half a point 
of north, two-thirds within a point. 
he magn netic declination was about 6° east. The observations were 
made when the sun was sue on the magnetic meridian. T. Hit. 
\Gatabridge, Mass., Sept. 6 
Yim 
_ 6. Classification of animals based on the principle of Cephalization ; by 
J. D. Dana.—A modification of the brief section on the elliptic me _ 
of debeptatiaatlon, ‘a page 327, is suggested in a note on page 35% 
The subject admits of much aide elucidation, and the following is nb 
presented as a substitute for the section referred to. 
9. Hlliptic.—Exhibited in the defectiveness or absence of segments or 
members mocmelly pertaining to the type of the order or ead contain 
ing the es, and arising from abnormal weakness in the ral sys- 
tem, or in te organ. It is exhibited especially in the depradacicant or 
sg 8 types. cases are— 
ncomplete or deficient (1) segments, or (2) members, in either (a) the 
aya or (6) the postervor portion of the body; as in the absence of 
some, or all, of the teeth in Edentates; of the posterior limbs in Whales ; 
of the abnormal appendages and posterior thoracic segments in some 
cece or degradational astar | of the. antenns, either one or 
pairs, in many inferior Entomost tracans; of wings in the Flea, ete. 
The method of decephalization differs from the defunctionative in im- 
plying a Seperated not only of function but also of organ or m 
ess or deficiency of normal parts referred to above 
will be nities appreciated if contrasted with a from other 
The principal other causes are the followi 
system 
- Very small, and elliptic both in erie and ‘autor. because of the 
high degree of cephalic concentration ; while in the Schi zopods referred 
to —— and in Pond cof nd many other inferior Crustaceans, the 
deficienc m weakness of life-system or decephalization. 
" (2), High devolot nal of oie pert of an organ, at the expense of other 
adjoit ning Pe Mews his Hees e may be said to include the preceding, 
since, in that, there is a high aphibobiiend of the anterior or cephalic por- 
tion ¢ of € the structure at the expense of the posterior or cireumferenti 
o. sie Nigga is reference to hore organs rather than to the structure 
whole: f a niarg nt of one 
