THE AMERICAN NATURALIST. [Vol. XXXVII. 



sandy or muddy bottom. In some localities it is quite plentiful. 

 It has been collected in three different places, all within Massa- 

 chusetts bay." Specimens have been taken off "Crab Ledge," 

 Chatham, in the deep waters of Muskeget Channel and in Vine- 

 yard Sound. The natural position of this hydroid is an upright 

 one. Hargitt (:oi, p. 313) describes this hydroid as "bright 

 pink in color, medusae light yellowish, manubrium, tentacles and 

 bulbs \ ki h." 



Corymorpha is always found as a solitary form, never budding 

 nor giving rise to colonies. The stems grow to a height of from 



the diameter decreases; the stem tapering 'gradually toward the 

 distal end, where it terminates in a short blunt point. The stem 

 is invested in a very delicate, filmy, colorless perisarc, which in 

 the upper region of the stem is very closely applied, but below 

 becomes separated from it by a very considerable space, forming 

 here a sort of loose fitting corrugated sae over the blunt point of 

 the basal extremity. The stem is seen to be traversed by a series 

 of longitudinal hands which anastomose with one another here 



numerous thread like filaments. 



The hydranth is somewhat flask shaped, the neck of the flask 

 being represented by the flexible proboscis at the distal extrem- 

 ity of the hydranth. In the centre of this proboscis is found the 

 mouth surrounded by from seventy-rive to eighty-five closely set 

 tentacles arranged in a number of irregular whorls, and having 

 somewhat the appearance of a brush. About the base of the 



number from twenty-five to thirty. § ^ 



upon slender branched pedicels which arise from the body of the 



There are from fifteen to twenty-five of these medusoid-bearing 



