(Api, 
differences, would undoubtedly have saved Mr. Ishikawa from 
useless speculation. His want of familiarity with the subjects of 
of his speculation is further shown in the description of the sixt 
somite of the abdomen, and of the “ entire ” and “ whole abdom- 
nal somite ” (by which apparently he intends to indicate thea 
domen itself).—S. Z. Smith, Yale College. 
CHELYDRA VERSUS Unto.—One day last June I came upon 
428 General Notes. 
snapping turtle in a peculiar predicament. There was clinging toit 
lower jaw a clam, which, though they were several rods from thè 
river, was still apparently alive. Without disengaging them 1 
brought them home and put them in a small box, intending tose 
how the contest would end. I kept them between two ang Mil = 
days, and they remained in the same condition. The turtles fre 
quent and vigorous attempts to push off the clam with its for 
legs proved unavailing. At length the turtle, by some misplacing i 
of the box, made good his escape, carrying off the clam with . 
him. The turtle was about a foot in length and the clam about 
three inches. The clam could not be expected to live very long 
out of the water, and the turtle would not be very com sec 
the water, with the water forcing its way down his eka 
occasional attempts of the turtle to go into the water would git 
the clam from time to time a new lease of life. «Fb 
probably Unio complanatus—¥. E. Todd, Beloit, Wis, 2e 4i 
188}. 
A New Species or Potypesmus wiru Eves.—The spect i 
Polydesmus, a genus embracing some of our most common 
riopods, are, as a rule, eyeless. We know of no 
species except the one under consideration, W 
Gervais (Aptéres) says of the family Polydesmidæ: 4°) o 
manquent presque constamment;” Wood in his i ae : 
North America speaks ot the “absence of eyes 1M re fail) 
Humbert in his “ Myriapodes de Ceylon,” remarks . hile of ve 
Polydesmidz : “ Yeux manquant le plus souvent, mre esett 
genus Polydesmus he says “ Pas de yeax ” Hence i generi! 
species is an exceptionable form, though the characters re eat 
are such as not perhaps to warrant a separation from 4 Oregot 
The specimens were collected by the writer at Potti i body 8 
The species may be called Polydesmus ocellatus, T ually cyi 
small, rather short, somewhat spindle-shaped, and e - the scut 
drical. There are twenty-nine segments behind the hea: There 8? 
are provided with the usual prominent lateral ridges. uci 
row of dorsal setæ on each side of the median line ob the he 
of the scutes is finely granulated. The sides (gen Jor sat abom 
are full and swollen, somewhat wider than the first icuots 
as wide as the body behind. Ocelli 12-13 in number 
and black. Antennæ with joint 4 half as long 
markably thick, increasing in thickness to the €n% 
