NO. 1 FRASER: HYDROIDS 35 



Gonothyraea gracilis (Sars) 



Laomedea gracilis Sars, Beretning om en Zool. Reise i Lofoten og 

 Finmarken, 1851, p. 18. 



Gonothyraea gracilis Fraser, Hyd, of Vancouver Island, 1914, p. 148. 



Distribution. — Braithwaite Bay, 30 fathoms; Tagus Cove, 30 fath- 

 oms; Post Office Bay, 10-15 fathoms; James Bay, 50-70 fathoms; Car- 

 tago Bay, 32 fathoms; between Charles and Indefatigable islands, 60 

 fathoms; La Plata Island, 45-55 fathoms; Port Utria, 15-20 fathoms; 

 Tangola-Tangola, 15-20 fathoms; off White Friars, 25 fathoms; east 

 of islands off Navidad Head, 25-35 fathoms; Isabel Island, 10-25 

 fathoms. 



Gonothyraea serialis, nevi^ species 

 Plate 8, Fig. 37 



Trophosome. — Zooids arising singly from the stolon, or w^ith a 

 succession of three or four, the second arising from the pedicel of the 

 first, the third arising from the pedicel of the second, et cetera, in each 

 case, somewhat nearer the distal end than the proximal ; highest colony 

 obsei-ved, 6 mm. Each pedicel has several annulations at or near each 

 end; each pedicel forms a definite "knee" at its origin. The diameter of 

 the hydrotheca gradually becomes greater from base to margin; length 

 0.7 to 0.75 mm., breadth 0.4 mm. Margin with 12 sharp teeth, dis- 

 tinctly but not deeply cut; each tooth has a distinct ridge which con- 

 tinues back on the hydrotheca as a distinct line. 



Gonosome. — Gonangia arising from the axils of the pedicels, or from 

 the stolon, with a short pedicel which has one or two annulations; 

 obovate, truncate, with a narrow but distinct collar. 



Distribution. — On a Lytocarpus stem at low tide, Port Utria; Bahia 

 Honda, 15-25 fathoms. 



Genus OBELIA 



Obelia alternata, ntw species 

 Plate 8, Fig. 38 



Trophosome. — Colony small and delicate, with a maximum length 

 of 5 or 6 mm., most of the colonies much shorter than this. Stem flexu- 

 ous, alternating to the one side and the other; very occasionally there is 

 a single branch ; the pedicel of each hydrotheca appears to be a con- 

 tinuation of the preceding internode of the stem, bending outward or 



