30 HYDROIDS COLLECTED BY THE " HUXLEY " FROM 



The hydrothecte are sessile, and around their orifice there are a 

 number of fine lines. These lines look like a striated band, but on 

 being subjected to a higher magnification each line is seen to be a 

 projecting rim and to represent a rudimentary hydrotheca. 



The gonangia (male) are very long and slightly curved. They are 

 situated on the side of the hydrothecre, either singly or in pairs. 

 Their distal end is rounded, and the proximal end tapers towards a joint 

 which is closed to the hydrotheca. The male gonangium agrees with 

 Bonnevie's description. The female form is still unknown. 



Distribution. Scotland, The Minch, in deep water (Hincks, 1868). 

 Norway, Bodo, Lofoden, 55-100 fathoms (Bonnevie). 



SERTULARID^. 



Sertularella polyzonias (Linn.). 



This species occurred at all the stations, except at the two over 

 400 fathoms. It was usually attached to worm-tubes, shells, and 

 occasionally to small stones or to another Hydroid. A few of the 

 colonies taken at Station II. bear gonophores. 



Jiiderholm has recently recorded this species for the Falkland Islands 

 and South Georgia. 



According to Nutting, the greatest depth recorded for this species is 

 353 fathoms in the North Atlantic, off Florida. 



Sertularella gayi (Lamouroux). 



Large colonies, some of which are loaded with gonophores and carry 

 their ova in acrocysts, were taken at Station VII., over 444 fathoms. 

 The species was also fairly common at Station XIIL, 412 fathoms. 



Some of the colonies have very thick stems, and are evidently of a 

 great age. Even quite small colonies have thick stems and branches, 

 and have the appearance of old colonies producing a new growth of 

 shoots. 



Both Sertularella i^olyzonias and S. gayi are common species on the 

 Eddystone Grounds, 30-35 fathoms, yet on this cruise S. gayi was only 

 taken at the two stations over 400 fathoms, and there S. ijolyzonias 

 was absent. 



Sertularella gayi has been taken in the Faeroe Channel at the depth 

 of 605 fathoms (Allman, 1874). 



Diphasia pinaster (Ellis and Solander). 



A few colonies, without gonangia, were taken at Stations I., II., IV., 

 and v., 75-109 fathoms. Some were attached to worm-tubes. 



Distribution. Hebrides, 40 fathoms; off Mull of Galloway, 110- 

 140 fathoms ; Dogger Bank ; Jersey ; Dublin Bay ; and other places 



