288 GYMNOCORYNE CORONATA. 



GYMNOCOEYNE, Hinch. 



Name. — From yvfxvoq, naked, and curyne, a genus of hydroids, in allusion to the absence of a 

 chitine-clothed hydrocaidus. 



TROPHOSOME. — ^Hydkocaulus undeveloped. HrDEORnizA a filiform stolon 

 invested with a chitinous perisauc. Htduanths sessile on the hydrorhiza, with 

 numerous tentacles, the distal tentacles disposed in a vertical round a conical hypo- 

 stome, the others scattered over the body. 



GONOSOME not known. 



The genus Gi/mnocorijne was established by Hincks for a little hydroid which he olitained 

 on the southern coast of Devonshire. Its most striking character by which it is distinguished 

 from all other coryniform trophosomes except that of Corynitis consists in the non-development 

 of a hydrocaulus. 



It comes very near to the genus Corynitis, from which, indeed, in the absence of all know- 

 ledge of the gonosome, it is chiefly distinguished by the verticillate disposition of its distal ten- 

 tacles, and though a tendency to this disposition is seen, according to Agassiz, in Corynitis, it 

 does not seem to be there much more marked than it is in many species of Coryne and 

 Syncoryne, while according to j\Ir. Hincks the oral verticil of tentacles in Gymnocoryne is so well 

 marked and constant as to recall the characteristic verticil of capitate tentacles which surround 

 the mouth in Clavatella. 



GXMNOCORYNE CORONATA, Ulncl'S. 

 Gymnocoryne coronata, — Hincks, in Ann. Nat. Hist., for Aug., 1871, pi. v, fig. 1. 



TROPHOSOME. — Hydranths " very minute, slender, enlarging slightly upwards," 

 with forty or more tentacles, eight or nine of which, thicker than the otliers, and 

 with larger capitula, form a verticil, encircling the oral extremity ; the others scattered 

 over more than three fourths of the body. 



GONOSOME not known. 



Colour. — Central })art of body reddish, hypostome opacpic white. 

 Locality. — Salcombe Bay, Devonshire, Mr. Hincks. 



