408 A. E. Verrill— Marine Fauna off New England Coast. 
corals. Indeed, I believe that the same explanation will apply 
to some of the ancient cyathophylloid corals, in which buds 
arise within and appear to destroy and supplant the parent 
ealicle. olay of se buds being the cause of the death of 
the parent-polyp, as has been supposed, I believe them to be 
due to the result of one and the consequent effort of the 
tissues to retain life and repair injuries. 
Restoration of the disk in Ophiurans. 
That Opbiurans ioe their rays seh remarkable facility 
when broken, or entirely lost, is well known. In examining 
a large series of peereat abdita May vollented in the harbor a 
oank, Conn., among ee]-grass (Zostera), in 1874, I feaed 
several specimens in which the entire dorsal disk, with the 
contained viscera, bad been lost and more o1 - less restored, 
showing the various stages of the process. The dorsal disk of 
a species is soft and swollen, a a is very easily detached. 
arms are exceedingly jong He net and subject to fre- 
net restorations. In some of the examples in which a new 
disk was forming, the scars are “till plainly visible, on the 
bases of the arms, showing where the disk had been torn 
away, and its former size. In some of these tha new disk, 
though perfect in form, had not grown to more than one- third, 
or one-half the diameter of the old one; in others it was 
nearly completec ese small disks connected ak the full 
sized arms and jaws of the adult, give such specimens a very 
peculiar appearance. At first I mistook some of these for the 
genuine young. ut a more careful examination easily re- 
vealed their true nature 
n the same lot were specimens in Dorie a portion Bie the 
edge of the disk, with one two of the arms, had 
stroyed, and afterwards seat | ia a few instances eee arms 
had grown out, in place of one. 
* It is quite berg that Amphi ura macilenta V., described i ake the February 
pays of this p. 142, is really the true young o of A soul There are 
aed ) oe low-water orm known to me. The red speci- 
diaka: appeared so different that, uutil I discovered their true 
wattied the identity of the two forms did not seem to me poss 
ERRATA. 
Page 309, line 26, for Ballicina, read Balticina 
Page 313, line 7 from bottom, for S. 0. are read (+. 0. Sars. 
