HYDKOIDS OF WOODS HOLE. 3/5 



long by about'o.2 mm. broad ; they are cylindrical in form, with 

 about 8-10 sharp, deeply cut teeth. Gonangia are elongate, 

 more or less cylindical, smooth, borne on delicate pedicels ringed 

 at proximal and distal ends. The hydranths are extremely deli- 

 cate, and with delicate orange to reddish tints just below the 



tentacles. 



OPERCULARELLA PUMILLA Clark. 



Among a few hydroids collected in March, 1908, by Dr. F. 

 B. Sumner were found a very few specimens of this species, a 

 record of which is important since I can find no evidence of its 

 occurrence since that of its original description by Clark. 1 He 

 records having taken it at Portland, Maine, and off Montauk Pt, 

 Long Island. The related species, O. lacerata Hincks, he records 

 from New Haven, Conn. Clark expressed some doubt as to 

 whether his species really came under the genus to which it was 

 assigned, and Nutting has expressed doubt as to the validity of 

 the species, believing it probably identical with 0. lacerata. My 

 own specimens conform very closely with Clark's description 

 and figures. It is a most beautiful and delicate little hydroid. 

 Stems and branches are annulated throughout. No gonangia 

 were present on my specimens. 



OBELIA CONGDONI, n. sp. 



On several occasions recently I have taken from floating gulf 

 weed at Woods Hole an Obelia which, while apparently closely 

 related to 0. hyalina Clarke, differs in several important features, 

 as will be pointed out later. 



Congdon has recently described a species from Bermuda, 

 which he referred to Clarke's O. hyalina, 2 but which I am convinced 

 is identical with the species under consideration, and which seems 

 to me to be an undescribed species. 



Congdon's description and figures are sufficiently accurate 

 to obviate necessity for any considerable details in this connec- 

 tion (cf. op. df.). A few points which seem to be in rather sharp 

 contrast with Clarke's species may be given. 



According to Clarke 3 the " branches of the stem arise in the 



1 Trans. Conn. Acad. Sci , Vol. III., pp. 61-2. 

 2 Proc. Am. Acad. Arts and Sci., Jan., 1907. 

 *Bu!l. Mus. Comp. Zool., Vol. V., 1879, p. 241. 



