[165] THE HYDROIDS 183 



CORYNE. 



Trophosome. Characters of the family. 



Gonosome. Reproductive elements produced in fixed sporosacs 

 growing on the hydranth body. 



CORYNE BRACHIATA sp. nov. 

 (Plate xiv, figs, i, 2.) 



Trophosome. Colony forming a dense tuft of irregularly branching 

 stems, sometimes attaining a height of about ^ inch. Stems and 

 branches profusely and regularly annulated throughout, fairly stout ex- 

 cept at the proximal ends where they taper gradually to their point of 

 origin ; distal ends of many of the branches bear a more or less regular 

 whorl, or radiating cluster, of annulated branchlets just below the 

 hydranth body, reminding one of the whorls of cirri around the stems 

 of the stalked crinoids. Hydranths large, with long, slender body and 

 proboscis and numerous (2035) capitate tentacles arranged in a 

 scattered or sub-verticillate manner over nearly the whole surface. 



Gonosome. Gonophores very numerous, borne among the tentacles 

 on the hydranth bodies, globular in outline and showing no traces 

 of radial canals or other medusoid structures. The specimens 

 secured were females and the gonophores were packed full of develop- 

 ing ova. 



Distribution. All the specimens were secured in Yakutat Bay, 

 Alaska, by Dr. W. R. Coe of the Harriman Expedition. 



This interesting species seems to be nearest to C. pusilla Gaertner, if 

 Allman has properly identified that species. It differs from other 

 members of the genus in the curious whorl of short branchlets which 

 bear neither hydranths nor gonophores and are situated a short distance 

 below the terminal hydranth of the stem or branch to which they are 

 attached. Another character not shown in the figures of this genus 

 published by Hincks and Allman, is the narrowing at the proximal 

 ends of the stems and branches. The specimens were found immersed 

 in sponge so far that only the hydranths extended above the surface of 

 the sponge. 



SYNCORYNE. 



Trophosome. Characters the same as those given for the family. 



Gonosome. Reproductive elements produced in free medusa with 

 a long manubrium and four marginal tentacles, each having a sense 

 bulb with an eye-spot at its base. 



