HYDROIDS OF THE WOODS HOLE REGION". 
357 
Halecium halecinum (Linn. ). Fig- 50. 
( Sertularia lialeeina Linn., Syst. Nat., p. 1308.) 
Trophosome. — Colony attaining a height of 6 to 10 inches, erect, rigid; stem fascicled, pinnately 
branched, internodes short. Hydrophores on long trumpet-shaped pedicels, margins frequently 
reduplicated. 
Gonosome. — Female gonangia in rows on upper side of branches, obconic in outline, with the 
aperture on one side of the truncated top, surrounded by a collar-like rim surmounted by a pair of 
hydranths. Male gonophores slender, oblong-ovate. 
Distribution . — Abundant throughout the Woods Hole region, growing on shells, stones, etc., in 
shallow water. 
Halecium articulosum Clark. Fig. 51. 
(Trans. Conn. Acad, of Sci. , vol. m, p. 63. ) 
Trophosome. — Colony sometimes attaining a height of almost 2 feet; stem fascicled, branches very 
long and slender, the ultimate branchless being pinnately arranged like those of the family Plumu- 
laridse. Hydrophores sessile, alternate, borne on the broadened distal ends of the almost triangular 
internodes. Hydranths very large, with about 20 tentacles. 
Gonosome. — Female gonangia obovate, with a latero-terminal aperture. Male gonangia long, 
slender, subcy lindrical . 
Distribution . — Long Island Sound (Verrill). The gigantic specimens referred to were secured by 
the Fish Hawk, station 7051, lat. N. 40° 46', long. W. 70° 42/. Depth 31 fathoms. The largest specimen, 
and it is probably the largest known specimen of the Hulecidse , is now in the U. 8. Fish Commission 
collection at Woods Hole. 
Halecium tenellum Hincks. Fig. 52. 
(Ann. and Mag. of Nat. Hist., 3d series, vol. vm, p.252.) 
Trophosome. — Colony very small, not over half an inch in height; stem not fascicled, delicate, 
irregularly geniculate; branches straggling, irregular; internodes very long and irregularly annulated. 
Hydrophores borne on very long, tubular pedicels, irregularly arranged. 
