684 The American Naturalist. [August, 
Lysiopetaloidea and Craspedosmatoidea,’ and is characterized by the 
greater number of segments, the free pedigerous lamin, the seven- 
jointed legs, the distinct mentum, and the normal presence of eyes. In 
the Merocheta the apertures of the external seminal ducts are small 
openings in the chitinous wall of the coxæ of the second legs, connect- 
ing with internal tube of nearly uniform diameter. In the Ccelocheta 
the cox contain a large cavity, while the aperture is large, the margin 
pilose and not chitinous.—O. F. Coox. 
EMBRYOLOGY. 
The Tentacular Apparatus of Amphiuma.—In the Journal 
of Comparative Neurology, Vol. VI, March, 1896, Professor J. S. 
Kingsley has written an article entitled “ On Three Points in the Nerv- 
ous Anatomy of Amphibians” in which he has endeavored to show that 
the tentacular apparatus of Amphiuma, briefly described by me (Jour- 
nal of Morphology, Vol. XI, No. 2), has been mistaken for a nerve 
and blood vessel. I consider the discovery of this degenerate organ of 
too much phylogenetic importance to be consigned at once to oblivion, 
and, therefore, offer in this article the results of a more careful study 
of it. 
Since histological detail is important in this investigation, I state 
briefly the technique. The specimen, seventy-eight millimeters in 
length and seven millimeters in body diameter, was hardened in Klein- 
enberg’s picro-sulphuric and, passed through the alcohol series from 
seventy to one hundred per cent and returned to seventy per cent, when 
the head was severed and placed three days in borax-carmine, then in 
acid alcohol twenty-four hours, after which it was imbedded in paraffine 
by the usual method and cut into serial sections one twenty-fifth of a 
millimeter in thickness. 
Figure I is magnified twenty diameters. The outlines of all the feat- 
ures were drawn with a Zeiss camera lucida, Every feature appears in 
š From the true Craspedosomatide there may be distinguished the Trachy- 
gonidz, Conotylide, and Cleidogonide, in addition to the Chordeumatide estab- 
lished by C. L. Koch in 1847, The separation of other equivalent groups will 
probably be necessary when a fuller knowledge of European and Asiatic forms is 
ined. 
' Edited by E. A. Andrews, Baltimore, Md., to whom abstracts reviews and 
preliminary notes may be sent. 
