' 
Botany and Zoology. 131 
by previous investigators. In Jubularia, Coryne, etc., the outer covering 
of the bud becomes the disc of the medusa, and the digestive tube is 
(Chrysomitra) of Velella has been observed and described by Huxley, 
Vout, Kolliker and others. The development of the medusa-buds in these 
j osto 
n. 
In the description of the Hydroidea of Charleston Harbor, Prof. Mo- 
Crady has more than doubled the number of species known to exist on 
th 
by their greater thickness. ‘The @lobiceps tiarella of Ayres (Hucoryne 
elegans, Leidy) is found in Charleston Harbor, and is placed in the genus 
P éennaria by P ‘O v. i its 
first 
young of a Cunina. The paper closes with a discussion of the geograph- 
~ Eaton of the American Hydroidea. 
. Nat. Hist., i, p. 
ES = by Prof. McCrady as Dailies to the toothed rods of the larvee of 
lerms, described by Joh. Muller, The great discrepancy in size 
