368 HALOCORDYLE. 



HALOCOEDYLE, AUmm. 



Name. — From aXc, the sea, and KopcvX>i, a club; in allusion to the club-like form of the bydrauths. 



Globiceps, — Arjres. 

 EucoRYNE, — Leidy. 



TROPHOSOME.— Htdkopiitton composed of a symmetrically ramified iitdro- 

 CAULTJS rooted by a creeping filiform htduohhiza, tlie wliole invested with a cliitinous 

 PERISAEC. Htdranths flask-sliapcd, with the filiform tentacles forming a single 

 verticil at the base of the hydranth, the capitate much shorter than the filiform, 

 arranged in one or more distinct verticils towards the distal extremity of the hydranth. 



GONOSOME. — GoNOPHORES phanerocodonic, developed between the filiform 

 tentacles and the proximal verticil of the capitate tentacles. Umbrella deeply 

 ovate, manubrium large, destitute of oral apendages ; marginal tentacles four, rudi- 

 mental; ocelli absent. 



For the institution of the present genus we are indebted to Ayres, who founded it on a 

 hydroid discovered by him upon the eastern shores of North America. To his new genus he 

 gave the name of Globicejjs. 



Shortly afterwards, without any knowledge of the previous observations of Ayres, the genus 

 was defined by Leidy, under the name of Eucoryne, with an excellent figure of the only species 

 as yet known. As Agassiz, however, has pointed out, both these names had already been appro- 

 priated, Glohicejis being in use for a genus of hyraenopterous, and Eucoryne for one of coleopterous 

 insects. There is, therefore, no alternative but to employ some other generic designation for 

 Ayres' and Leidy's hydroid, and as Agassiz proposes none, the name of HalocorJyle has here 

 been substituted. 



HalocorJyle has close affinities with Pennaria, from which, however, it is at once separated 

 by the verticillate arrangement of its capitate tentacles, which in Pennaria, instead of being 

 verticillate, are scattered on the body of the hydranth. 



