12 MR JAMES RITCHIE 



Ilehella striata, var. plana, n. var. (PI. I. Fig. 8.) 



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

 resemble those of H. striata. The hydrothecge, however, are rather larger, 1 "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 eases, while a soUtary peduncle was marked by a thickened rino; near its base. 



Gonosome. — Not present. 



Locality, etc. — Creeping on the stems and branches of Halecium robiistum, 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, Linnaeus, 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 aunulations. 



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. 



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

 mm. Peduncle: length, 0"2 mm. 



Locality. — Burdwood Bank. Lat., 54° 25' S. ; long., 57° 31' \V. 56 Fathoms. 

 1st December 1903. 



Family Lafoeid^. 

 La/oca antarctica, Hartlaub, 1904. 



The above species occurs on the stems and branches of Sertularella Jiliformis. 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 r25 nam. 



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

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



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



(ROY. SOC. EDIX. TRANS., VOL. XLV., 530.) 



