NEW SPECIES OF HYDROIDS FRASER 79 



sharp angle with the body, but when the gonophore develops the 

 bract is gradually forced outward distally until it is nearly at right 

 angles to the body. 



Gonosome. — The gonophores develop to form sporosacs in the angle 

 between the tentacular bract and the body of the hydranth; they are 

 almost spherical, with very short pedicels; ova relatively large and 

 not numerous. 



Type.—U.^.'^M. No. 43450. Taken by the United States Fisheries 

 steamer Albatross at station 4253, Thistle Ledge, Stephens Pass, 

 Alaska, 131 fathoms, July 14, 1903. 



Family HYDRACTINIDAE 

 Genus HYDRACTINIA van Beneden 



HYDRACTINIA VALENS, new species 



Plate 13, Figuee 2 



Trcphosome. — Colony growing from a thick, basal coenosare, pro- 

 vided with short, smooth spines; nutritive zooids large and lusty, 

 reaching a height of 4.5 mm. ; 10 tentacles in rather regular whorls. 



Gonosome. — Generative zooids (only female zooids obtained) about 

 one-half of the length and breadth of the mature nutritive zooids; 

 tentacles wholly lacking; sporosacs 3-5, forming a whorl at the base 

 of the proboscis ; commonly 6 ova in each sporosac. 



Other zooids. — None observed. 



Ty/^e.— U.S.N.M. No. 43451. Taken by the United States Fisheries 

 steamer Speedivell at station 284, latitude 42° 10' N., longitude 70°22' 

 W., southwest of Stellwagens Bank, near Race Point Light, Cape Cod 

 region, 31 fathoms, August 4, 1879. 



Family CORYMORPHIDAE 

 Genus CORYMORPHA Sars (in part) 



CORYMORPHA ADVENTITIA, new species 



Plate 13, Figure 3 



Trophosome. — Zooids 20 mm., of which the hydranth is approxi- 

 mately one-fourth, with adventitious shoots, the longest 0.25 mm., 

 passing backward from the main hydrocaulus at various angles, to 

 serve as accessory means of attachment; the hydrocaulus has much 

 the same diameter throughout, or this may increase slightly, distally ; 

 proximal tentacles 20-24 in one whorl, distal tentacles very numerous 

 in several irregular whorls. 



