136 Scientific Intelligence, — = 
. On the Eyes of the Balanus; by Dr. Leipy, (Proc. Acad. Nat. 
£1, 1 . 1, vol. v.)— —Dr: Leidy remarked, that the exist+ 
es in the ‘perfect condition of the Cirrhopoda, has 
all anatomists up to the present time, but its presence in the 
erfect stages is very generally acknowledged. ‘Several 
received some living specimens of Balanus rugosus 
to an oyster, he submitted them to dissection, in the 
of which, he noticed upon the dark purple membrane which lines the 
shell and muscular columns running to the opercula, on each side of 
the anterior middle line, a small, round, black body, surrounded by a 
colorless ring or space of the membrane, which, upon fe EO toa 
ow power of the microscope, he found to be an eye, composed ofa 
vitreous body, having nearly two-thirds of its posterior a covered by 
pigmentum nigrum, and attached to a nervous filament, which he after- 
wards traced to the supra-cesophageal ganglia. The presence of this 
organ in other species or genera, he had not yet had an opportunity of 
determining. 
3. A comparison between Sterna Cantiaca, Gm., of Europe, and 
Sterna acuflavida, Nobis, hitherto considered identical with S. Cantiaca, 
and a description of a new species of Wren; by Dr. Canor, (Proc. 
Bost. Soc. Nat. Hist., Nov. 7 1847, p. 257. Yar the following meas- 
urements from adult, full- plumaged si were given: 
Millimetres. European. 
Bill along ‘tidge, Tee eee 57 
gape, ee 75 
a rom yt nostri to the point of the bill, + 5 iene aaa 4l 
Length of nostril, 6 ou 
Length of ron mandible along the centre, (meas: 
uring to the feathers, 41 47 
Length of do. do. along the side, ‘do. do. wi WA 62 
Width of. bill at commencement of feathers i. 74 
Depth of do. do. do. / 114 124 
Length of wing from flex ‘ . 290 317 
- Length of tail to tips of atin feathers, “ «. «dae 149. 
’ » . . » ae 28. 
Middle toe without the claw, ’ ; i 18 21. 
- Middle claw Yh ia ae et 9 
Toner toe with claw, sic 3 ¥ . 17 20. 
Outer do. ee ee 21 26 
humb 64 BS 
Besides these differences in the measurement of parts not subject to 
change from improper stuffin @, &c., we find that the coloring differs in 
some very important particula ars. In the American bird the yellow is 
strictly confined to the tip of the bill, and the line of union of the yellow 
and black is perpendicular and unbroken, whereas in the European 
bird the yellow runs up to the inner edge of the symphysis on the une 
der side of the lower mandible, and almost as far on the upper ed 
and on the upper mandible also, it extends ee on the ie an ron 
the ridge much higher than in the Anterican bird. The p ies are 
darker in the American bird than in the European, at the white 
