530 MR JAMES RITCHIE 



Ilebella striata, var. plana, n. var. (PI. 1. Fig. 8.) 



A colony creeping upon Halecium rohustuvi, whose habit and general appearance 

 resemble those of H. striata. The hydrothecse, however, are rather larger, I '3 to 1'4 

 mm. in length by 0'28 mm. in diameter, and show no hint of the annular thickenings of 

 perisarc which form the characteristic striations. Marginal reduplications were noted 

 in some cases, while a solitary peduncle was marked by a thickened ring near its base. 



Gonosome. — Not present. 



Locality, etc. — Creeping on the stems and branches of Halecium rohustum, from 

 Station 411. Lat., 74° 1' S. ; long., 22° 0' W. Depth, 161 fathoms. Surface tempera- 

 ture, 28°-9. 12th March 1904. 



In none of the true H. striata colonies did there occur hydrothecse with more 

 than about a third of their surface smooth, the remainder of course being striated, 

 and even these were exceptional. Hence an entirely smooth hydrotheca seems worthy 

 of being considered a distinct variety. 



Calycella syringa, Linnseus, 1758. 



Arising from a tubular, creeping stolon are several minute, extremely delicate, almost 

 campanulate hydrothecse whose cavities are separated from those of their peduncles by 

 thin partitions. They are operculated, and are borne on peduncles of variable length 

 which are always marked by many strong annulations. 



The absence of gonosomes and the unsatisfactory state of the hydranths render 

 accurate identification impossible, but the trophosome agrees with Hinks's (1868) 

 description of C. syringa, except in that the " horn-colour " is lacking. 



Measurem.ents. — Hydrotheca : length, including operculum, 0"2 mm. ; diameter, O'l 

 mm. Peduncle : length, 0'2 mm. 



Xocate^. —Burdwood Bank. Lat., 54° 25' S. ; long., 57° 31' W. 56 Fathoms. 

 1st December 1903. 



Family Lafoeid^e. 

 Lafo'ea antarctica, Hartlaub, 1904. 



The above species occurs on the stems and branches of Sertularella filiformis. It 

 agrees in all respects with the description given by Hartlaub. The. large number 

 of the regeneration rings on the hydrothecse is especially noticeable — six being not 

 unusual. The length of the hydrothecse, from where they leave the stem at right 

 angles, to the margin, averages 5 or 6 mm., while the diameter is about 1'25 mm. 



Locality, etc. — Creeping on the branches of Sertularella filiformis, from Burdwood 

 Bank. Lat., 54° 25' S. ; long., 57° 32' W. Fathoms, 56. Date, 1st December 1903. 



Previous Locality.— 70° 23' S. ; 82° 47' W. 



