NO. 1 FRASER : HYDROIDS 23 



situated about midway up on the hydrocaulis. The male sporosacs are 

 few, arranged in an irregular series. The large female sporosacs are 

 much more numerous in a somewhat irregularly crowded series; the 

 ova in each sporosac are numerous, but because the sporosacs are so 

 large the ova are still quite large. 



Other zooids. — None observed. 



Spines. — The elongated spines or, more properly speaking, tubes, 

 since they do not seem to be closed at the slightly tapered distal end, 

 are smooth, 1.5 mm. long; some of them shorter, seem to be broken off. 



Distribution. — Tagus Cove, 10-18 fathoms; Post Office Bay, 8-10 

 fathoms. 



Hydractinia multispina, new species 

 Plate 4, Fig. 20 



Trophosome. — Large colonies growing from basal coenosarc, made 

 up of a network so close that it is practically continuous. The nutritive 

 zooids are large for the genus, as much as 3.5 mm. long when con- 

 tracted. The tentacles are numerous, 36, in two quite definite series. 



Gonosome. — Although colonies were obtained from four localities, 

 they were all female. The generative zooids are somewhat smaller than 

 the nutritive, and the tentacles are reduced in number, 12-15. The 

 sporosacs are few, 4 or 5, attached just proximal to the tentacles, with 

 a few, not more than 8, ova in each. 



Other zooids. — None observed. 



Spines. — From the coenosarcal base arise numerous smooth spines, 

 nearly cylindrical but tapering slightly to a blunt tip, most of them 

 about 0.6 mm. in length but some of them slightly longer. 



Distribution. — On large shells between Charles and Indefatigable 

 islands, 60 fathoms; Post Office Bay, 10 fathoms and 12-15 fathoms; 

 Black Beach, low tide. 



Hydractinia polycarpa, new species 



Plate 5, Fig. 21 



Trophosome. — Nutritive zooids in greatest extension 1,8 mm., with 

 8-10 tentacles. 



Gonosome. — Female generative zooids, shorter, 1.0 mm., and more 

 slender than the nutritive zooids; no tentacles; the distal end is some- 

 what swollen and is well provided with nematocysts; the swollen end 

 is much darker than the rest of the zooid, a dark brown, almost a 



