HTDROID9 OF THK WOODS HOLK 



337 



PKNNAKIA. 



Tfii/iliiuuiiin: Colony ]>innately branched, with a pronounced chitiuous periaarc. Ilydranths with 

 a pyrifonn body and long mobile proboscis beset with capitate tentacles. 



(iniKMiini'. Gonophores borne above the proximal row of tentacles. Medusie oblong ovate, 

 with a very large proboscis bearing the sexual products. 



Pennaria tiarella McCr. Figs'. 14 and 84. 

 (l>ro(w<liiiK* Elliott Soc.. vol. i, No. 1, p. I."*!.) 



Ti-ii/ihiHttiitii: Colony attaining a height of about 6 inches, with main stem and branches geniculate 

 and beautifully annulated above origin of each branch, branchlet, and pedicel. Hydranths large, the 

 ones terminating branches being decidedly larger than the 

 others; a basal whorl of about 12 filiform tentacles, and a 

 number of capitate tentacles disposed in indistinct whorls 

 on proboscis. 



(lonosvmr. Gonophores attached to hydranth body 

 just above whorl c >f filiform tentacles, and producing oblong- 

 ovate sessile mednsje which sometimes give forth sexual 

 products while still attached, and sometimes l>ecome free 

 before giving forth the sexual products. 



Color. Stem horn brown with darker areas at the 

 annulations. Hydranth body lined with vermilion, which 

 shows through, producing a beautiful contrast with the 

 white tentacles. Sessile niedusic greenish with vermilion 

 markings. 



DixtrlliHttdn. Abundant on the piles of Fish Com- 

 mission dock at Woods Hole, and also growing profusely 

 on eelgrass near the Hole. One'of the most abundant and 

 lieautiful species on our coast,*. 



CORYMORPHID^;. 



Tmphrmotitr. Ilydranths solitary, without complete 

 tube of perisarc, and having proximal and distal whorls of 

 filiform tentacles, and a number of fleshy or tubular proc- 

 esses on the proximal end of the pedicel or stem. 



fiiniosome. Gonophores producing medusa; which 

 have 4 radiating canals and 1 to 4 marginal tentacles, of 

 which one is much the largest. 



15. Oorymorpha pendtila Ag. 



CORYMORPHA. 



Tni/ihiixome. Hydranth sharply distinguished from 

 its pedicel and with numerous short filiform tentacles 

 arranged in several closely set whorls around the distal end of the proboscis and a single whorl of 

 larger tentacles around the base of the body. 



Cinnoiome. Gonophores borne on branched pedicels above the proximal whorl of tentacles and 

 producing fixed or free medusae with either a single large tentacle or 4^tentacles, one of which ia 

 much the largest. 



Corymorpha pendula Ag. Fig. 15. 

 (Cont, Nat. Hist, U. S., IV, p. 276.) 



Trophosome. Hydranths attaining a height of 3 to 4 inches when alive and fully extended. 

 Pedicel with canaliculated cosnosarc, the canals appearing superficially aa longitudinal banda which 

 anastomose, especially on the proximal part of the pedicel, the distal part of which ia abruptly 



F. C. B. 1899-22 



